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Intel Pentium Dual Core E5400 VS. AMD Athlon II X2 250 BE

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July 22, 2009 9:42:08 PM

Lads, i must choose between:-

1 - Pentium Dual-Core E5400, 2.7 GHz, 2 MB, 800 MT/s, 13.5x.
2 - Athlon II X2 250, 3.0 GHz, 2 MB, 2000 MT/s, 15x.

The AMD is slightly better when theyr'e both stock, but OCing wise the E5400 can OC to 4.0 GHz with a good air cooler, but i have no info on the OC limits of the AMD... I know that the AMD is a Black Edition, so its more flexible, but is it as highly overclockable?

Although I admit, I wont be OCing them anywhere near their limits as i'll b using stock coolers...

I have a ATI Radeon HD 4670 1 GB GDDR3 that i bought 2 days ago and my monitor's max resolution can only go up to 1280x1024.

Everything, except RAM, ill b recycling from my current PC such as PSU, Hard Drive, Case, graphics card, etc.
MOST IMPORTANTLY, I am EXTREMELY budget sensitive, and I'll only need this set up for a maximum of 1 year. I'll be buying a really cheap mobo with basic OC abilities, nothing fancy at all.

SO, what do u advise? Intel Pentium Dual Core E5400 OR AMD Athlon II X2 250 BE?

Thanks.
July 22, 2009 10:00:49 PM

Because the e5400 comes with a really small and hardly efficient cooler I'd take the Athlon. Perhaps it won't OC to 4ghz but neither will e5400.
July 22, 2009 10:06:15 PM

hmm... the cpu fan for my pc broke about a year ago and i replaced it with an intel certified fan for intel core 2 duos...

would the same fan come with the e5400, or a less capable one?
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July 22, 2009 10:13:23 PM

this one which comes with e5400 is twice smaller just like with e8500. You would get something around 3-3.2ghz with it, no more. I got 3.8ghz on e8500 on my brothers rig, but with Pentium D's heatsink. I believe athlon will be better, especially when Phenoms on am3 will arrive. You will be able to get a modern cpu;))
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July 22, 2009 10:40:49 PM

The Athlon II X2 250 does not have a black edition. I think you're thinking of the Phenom II X2 550. Anyway, the E5400 is a little better clock for clock than the AMDs and you will get a higher overclock percentage wise with the Intel. The thing is, to overclock the Intel you need to invest a bit in a good board. AMDs are a little more forgiving as far as the motherboard goes so you can usually get buy with a cheaper board.

If you're on a budget then an Athlon X2 250, or even the Phenom II 550, with a 780G or 770 board is pretty cheap and will let you put money towards other components. Whether you choose Intel or AMD, make sure you get a good Air cooler if you want to get anywhere close to 4.0GHz as the stock cooler won't do. 120mm Xigmatek or Sunbeam cooler would do nicely ^_^.
July 22, 2009 10:55:00 PM

oh yes, i just double checked, sorry, ure right, not Black Edition. im still tlking botu the same processor, i was just mistaken; it isnt a BE.

if thats the case "AMDs are a little more forgiving as far as the motherboard goes so you can usually get buy with a cheaper board" - ill prolly choose AMD, then.
hmm... Phenom II 550 BE might cost too much for me, sadly...

hmm... but which has the better stock cooler? i cant afford an after-market one; im strictly limited to a budget of USD $190 - 220, which includes a CPU and a MOBO...

btw, the 550 beats any intel E7000 series, right?
July 22, 2009 11:39:58 PM

Why not the E5200? Should reach same OC as that e5400. The last SBM we hit 3.5GHz on the puny stock Intel cooler. That CPU even reached 4.0GHz on a sub $70 mobo (but couldn't stability test it because of temps/cooling). Current price at Newegg is about $129 for that mobo+CPU. For your budget, you could do a better mobo, and even a $25 cooler. Of course, if your C2D cooler is a bigger/copper model it could allow higher voltage/clocks.
http://www.tomshardware.com/reviews/core-2-overclock,23...

The PII 550 is a sweet CPU that can approach the same OC as the E5200. Much higher stock performance than the E5200, but clock for clock I'd wager they are pretty close. Stock is no contest which performs better as the 550 has decent clocks out of the box. For the OC'er both are excellent options. Haven't had the pleasure to pit them against each other, but IMO the E5200 may very well be able to top the 550 once both are max OC'ed.
July 22, 2009 11:45:41 PM

^+1. The E5200 is a great chip for overclocking and a good chip for budget gaming builds.
July 23, 2009 12:01:26 AM

^ Yeah, it's hard to argue against the E5200 for those who are on a tight budget and are willing to OC. AMD's more expensive 550 and 720 BE are very nice, but IMO no doubt the E5200 still owns the title for best bang/buck budget OC CPU.
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July 23, 2009 3:40:52 AM

The Athlon II is faster than an E5200. Not only that with Windows7 coming along, pick a CPU that has virtualization support.

I've done my own testing, and my AthlonII 250 is a match for my E7300. Still skeptical, here is some preliminary testing of AthlonII 240 vs. E5x00.

http://en.hardspell.com/doc/enshowcont.asp?id=6438&page...
July 24, 2009 9:07:40 AM

I live in the Dubai, in the UAE, and I had the shop I deal with check and they don’t stock any AMD dual cores or Intel Pentium Dual Cores! No E5200, no E5400! They don't even stock the C2D 7000 series!! Only the E8000 series, and the cost of one 8400 is almost my entire budget!
And its not just the shop that checked; it’s the entire Computer Plaza,

But I was told I can order the AMD, it would take a week to arrive... I’ll need to check on the E5000's, see if those can be delivered...

I’m not sure what I’m gonna go for yet, they both seem pretty good and pretty cheap... ill most likely choose whichever is cheaper where I am...

Since they’re more or less the same, I’m considering these CPU's:-
1 - Athlon II X2 250
2 - Phenom II X2 550 BE
3 - Pentium Dual-Core E5200
4 - Pentium Dual-Core E5300
5 - Pentium Dual-Core E5400

And ill get the one that’s cheapest, probably, but if there isn't a large margin between the E5200 and the E5400, I’ll probably go for the 5400 because of the higher multiplier...

Thanks guys. When I decide on the CPU, expect me back here to ask for advice on which motherboard to get; it’ll b easy, I anticipate very limited options here…
July 24, 2009 9:08:21 AM

*And its not just the shop that checked; it’s the entire Computer Plaza, a hub of PC and laptop shops...*
July 24, 2009 12:35:58 PM

Ouch, that hurts. Well, you have a good selection to look for, not matter the brand. Good luck!

Keep in mind, the E5200 already has a high 12.5 multiplier, so it has the potential to hit 4.16 GHz at FSB-1333 (like the E8x00's use stock).

All I recommend for E5x00 overclocking is lower the multiplier and take it straight to 333 (1333). From there up the multiplier (and cpu voltage) as needed. If you want to squeeze all you can from it, then up the FSB in small increments after you can't hit the next multiplier. I wouldn't really see getting any extra OC benefit from the E5400's higher multiplier unless you can't run FSB-1333 for some reason.
July 24, 2009 12:56:04 PM

but wont i need a good cooler for that?

im almost certainly going to be using the the stock fans...

and 4.2 is way too much, ill aim for 3.6 - 3.8 Ghz, ill just instantly jump it to 1066 and see how high i can take it before it heats the temperature ceiling...
July 24, 2009 1:05:33 PM


btw, how do u know what the max safe, full-load operating temperature is for ure CPU?
i was just on intel's website for the E5400, and it says "Thermal Specification 74.1°C" does that mean that 74 degrees centigrade is the max temp?
http://ark.intel.com/Product.aspx?id=40478
July 24, 2009 1:39:35 PM

Yes, you would need a good cooler for 4.0GHz. Of course, if you prices were our prices... an E5200 + good cooler is cheaper than the PII X2 550.

With the puny stock E5x00 cooler, don't expect to go beyond 3.5GHz. You'd likely be limited to about 1.25V, and it's luck of the draw how high your chip will go at that voltage. Worst case, with a bad chip, poor case airflow, and high ambient room temps, you may be stuck near 3.0GHz. A fully stable 3.2-3.5GHz would be my general expectations. But, with your bigger Intel C2D cooler, 3.6 GHz+ is very possible.

Max E5200 load temps I like to see while running prime 95 stability testing is 70C. During normal use you will not get near those temps.
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July 24, 2009 1:48:32 PM

pauldh said:
Yes, you would need a good cooler for 4.0GHz. Of course, if you prices were our prices... an E5200 + good cooler is cheaper than the PII X2 550.

With the puny stock E5x00 cooler, don't expect to go beyond 3.5GHz. You'd likely be limited to about 1.25V, and it's luck of the draw how high your chip will go at that voltage. Worst case, with a bad chip, poor case airflow, and high ambient room temps, you may be stuck near 3.0GHz. A fully stable 3.2-3.5GHz would be my general expectations. But, with your bigger Intel C2D cooler, 3.6 GHz+ is very possible.

Max E5200 load temps I like to see while running prime 95 stability testing is 70C. During normal use you will not get near those temps.

Are you Gao Dong Hua(Paul)?
July 25, 2009 11:23:35 AM

Yo, guys, I went today personally, and these r the results:-

1 - No new dual core AMD's are available. At all.
2 - E5200 - USD $76.
3 - E5300 - USD $79.
4 - E6300 - USD $95.

So since the AMD's are not available, i must go with Intel. Due to the prices, the E5300 offers best value.

The motherboard available was the ASUS P5KPL-AM SE, and it costs USD $58.50. Could u plz lemme know what u think...

http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://usa.asus.com/products.aspx?l1=3&l2=11&l3=563&l4=...

I also have the option to go for a cheaper ASRock G31M-S Mobo, for USD $45.

http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.asrock.com/mb/overview.asp?Model=G31M-S

Remember, I was willing to spend USD $205, and I will want to overclock it the E5300 to at least 3.2 Ghz... So, what say u?
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July 25, 2009 11:38:07 AM

I would choose ASUS without even thinking it if I were you. Btw, I am with an ASUS P5KPL-CM which is very very similar to the one mentioned by you. Don't expect too much from a G31 m/b though.

http://www.asus.com/product.aspx?P_ID=xs6iinKxu0y5agcg&templete=2

http://www.asus.com/product.aspx?P_ID=6nnVb6RBxd7PhGmt&templete=2

p.s. CM with Gigabyte LAN and worse component, whereas AM with 100/10 LAN and slightly better component.
However, I don't think you are going to use this rubbish G31 for very long. Hence, I suggest that you
get whichever is cheaper.
July 25, 2009 11:45:19 AM

but surely it would OC to 3.2 - 3.4? maybe even 3.6, if the fan can handle the heat?

Both boards claim to go to FSB 1600...
July 25, 2009 11:56:35 AM

Your prices are very good, similar to ours in the USA. There's plenty in your budget for a better mobo. If you truly want to push that CPU, look for a P45 chipset motherboard. There is only one available in Micro ATX (DFI p45 jr) though.

I don't have any G31 OC experience. I know decent OC's have been reached on some though. Asrock has some surprising OC features in budget boards. I was able to reach 4.0GHz with an E5200 on a Micro ATX Asrock G41M-LE in the last SBM:
http://www.tomshardware.com/reviews/core-2-overclock,23...


@ andy: Gao Dong Hua??? I'm guessing no. :) 


BTW, either E5200 or E5300 will do. $3...why not. I'd avoid the Pentium E6300 though as the lower multiplier may limit your OC abilities on certain mobos.
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July 25, 2009 11:57:07 AM

seerwan said:
but surely it would OC to 3.2 - 3.4? maybe even 3.6, if the fan can handle the heat?

Both boards claim to go to FSB 1600...


hmmmm.... you'd better not OC it that much with crappy G31 board. However, it should be fine if you have a fancy HSF and a quality cooling case.

Someone OC the E5200 to 4Ghz with water cooling though. Give it a try.

Good luck!
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July 25, 2009 12:04:16 PM

pauldh said:
Your prices are very good, similar to ours in the USA. There's plenty in your budget for a better mobo. If you truly want to push that CPU, look for a P45 chipset motherboard. There is only one available in Micro ATX (DFI p45 jr) though.

I don't have any G31 OC experience. I know decent OC's have been reached on some though. Asrock has some surprising OC features in budget boards. I was able to reach 4.0GHz with an E5200 on a Micro ATX Asrock G41M-LE in the last SBM:
http://www.tomshardware.com/reviews/core-2-overclock,23...


@ andy: Gao Dong Hua??? I'm guessing no. :) 

+1 p45 for OC

@Pauldh: you liar :p 
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July 25, 2009 12:08:50 PM

Actually, Asus P5Q pro and P5Q-E are very good choices if you are willing to put more money into it.
July 25, 2009 12:39:50 PM

pauldh, thnx alot, if they have the Mobo used in that article, the ASRock G41M-LE, im definitely getting it, with the E5300!

if not, ill take the lower version ASRock. Cheaper and more OC options.

Thanks alot, bro!

N Thanks to everyone else as well.

@ andy5174, what extra features do the P5Q Pro and P5Q-E have that would make me want to get them? id appreciate the input.. thnx..
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July 25, 2009 1:00:07 PM

seerwan said:
@ andy5174, what extra features do the P5Q Pro and P5Q-E have that would make me want to get them? id appreciate the input.. thnx..

Get whichever is the cheapest if you are not going to use it for more than 2 years, because I don't think there will be any problem with your m/b within 2 years
with NORMAL usage and 775 is a dead socket already which will be obsolete in less than a year.

P5Q pro, P5Q-E and GA-EP45-UD3P are recommended if you are going to use them for 3 years or more.

p.s The performance of Q9550 is very very similar to that of the i7-920 and runs much cooler with much less power, so I would just get a better p45 board(which is immensely cheap now compared to the i7 platform) and then upgrade to a Q9550 when i5 come out(Q9550 will be very cheap then) if I were you.
July 25, 2009 7:25:48 PM

I'll only need this setup for about a year to 18 months, once I graduate, one of the first things I'll be getting is a new state-of-the-art Desktop... so, cheapest... ok...

na, thanks, but unnecessary... by that time, I'll have the dough to an some Epic setup...
July 25, 2009 8:34:26 PM

I have a X2 550 Black Edition and its well, very well i think so.

SM 2.0 Score 7424 :p 
SM 3.0 Score 7825 :p 
CPU Score 2650@3078 :bounce: 
3DMark Score 15604

now....X2 550 3.1@3.570 (17x) 210mhz +0.25voltaje cpu temps 40 45grados very easy overclock :love: 
zotac gtx @260 700/1400/1050 :sol: 
1333@1400value ram :hello: 
gigabyte 790XT UD4P chip 790x :sweat: 
tacens radix III 520w :non: 

With this config
July 26, 2009 1:51:18 PM

seerwan said:
pauldh, thnx alot, if they have the Mobo used in that article, the ASRock G41M-LE, im definitely getting it, with the E5300!

if not, ill take the lower version ASRock. Cheaper and more OC options.

Thanks alot, bro!

No problem, good luck!

Just to clarify: I'm the author of that SBM article and chose the Asrock G41M-LE for overclocking a FSB-800 chip with a high multiplier(E5200). I can vouch for it given that purpose, but would not expect good OC results with a FSB-1333 E8x00 chip. In that situation I'd recommend a P45 motherboard like we used in other SBM's.
July 26, 2009 2:58:35 PM

oh no, im DEFINITELY getting the E5300, and ive pretty much decided on the Mobo; it'll almost certainly be an ASRock, the one with the G41 chipset is preferable, but if not available where i live, then the one with the G31 chipset. i am unlikely to go for the Asus mobo, as the ASRock is cheaper and provides more overclocking options.
July 26, 2009 3:28:49 PM

I figured you would go for the E5300.

Just wanted to be clear (for anyone else reading this) the Asrock G41 is being recommended for E5x00 overclocking, and not for chips starting at FSB-1333 stock. E5x00's don't like a high FSB, and I didn't get a chance to try a different chip in that SBM system to see just what FSB the mobo reach.
July 26, 2009 3:48:15 PM

Btw, paul, the E5300 FSB runs at 800. In u’re article, you pumped the FSB to 1333 to reach 4.0 Ghz... Was it unstable? If it was, is there any way to stabilize it?

Also, you achieved a stable OC at 3.66 Ghz on the stock cooler... would a MUCH higher OC been possible with an aftermarket CPU cooler that costs USD $80 - $ 110?

Thanks…
July 26, 2009 5:41:39 PM

Basically, I could not stability test it because of insufficient cooling (small case + stock cooler). Better cooling and a bit more CPU voltage, it would have been stable at 4.0GHz anyway. I doubt it would have been fully stable at the 1.325V seen in that screenshot.

The worst E5200 I have tested needed 1.4V for stability at 3.8GHz, and a whopping 1.456V to to reach 3.9GHz. However, the E5200 we received for this last SBM was a very, very good one. Judging how it was scaling by voltage, IMO this one should have done 4.0 - 4.16GHz at 1.4V.

edit: BTW - you'd only need a $25-40 cooler for a 4.0GHz E5200.
July 26, 2009 7:39:16 PM

i see... excellent...

25 - 40? bloody marvellous!
July 27, 2009 2:44:24 AM

btw - might be a bit of a noob question, but i just checked and on all 3 mobos, the PCI Express x16 slot isnt a PCI Express x16 2.0, so will it run the card to max capability or will it b bottlenecked by the slower connection?
July 27, 2009 5:54:55 PM

If you want, you can get a AM2 ATHLONX2 7850 2.8GHZ 2MB DUAL CORE BLACK EDITION and cost 62€ and mobo AM2 ASUS M3A78-CM DDR2 and cost 67€.

Are you mad?
E5400 cost 80€
X2 550 3.1 6mb cache black edition 01/06/2009 100€!!!!!!!
The X2 550 can get 3.8, 4.0. and X2 250 3.750

4.0 oveclcok is a very hard overclock, i think.Sound,temperatures, hard voltaje....
Its easy overclock until 3.1 but if you pass this, become more dificult.

You can get Amd 7850 its cheaper if you want for only a year.


July 27, 2009 6:54:37 PM

seerwan said:
btw - might be a bit of a noob question, but i just checked and on all 3 mobos, the PCI Express x16 slot isnt a PCI Express x16 2.0, so will it run the card to max capability or will it b bottlenecked by the slower connection?

Don't worry about it for your card. And especially not at that resolution.

If it was a pair of 4870's and a crossfire mobo limited to PCI-e x8 / x8 then you'd be limiting performance not having 2.0. It's quite possible that the GTX 295, HD 4870 X2, or next gen cards could be limited at high resolution on one of these 1.1 x16 mobos, but I am yet to see any real evidence confirming how bad it would be.
July 27, 2009 7:16:51 PM

@ usuario - i did want the X2 550 BE, it offers significantly superior performance compared to the E5x000 series, and it overclocks highly as well, but its just not available in my part of the world, and neither is the X2 250.

The 7750 / 7850 BE is available (cant remember which it was), but cost USD $95, the exact same cost of the E6300 which offers vastly superior performance. Also, even though the 7850 is a BE, it overclocks poorly, ive checked reviews of it.
But even if it did OC well, it costs more than the E5x000 where i am, and the E5x000 is a more modern, superior OCing, cheaper, faster.

@ pauldh - alright, xcellent, thanks.
ina year when i go for a serious machine PCI-e 3.0 will be the standard, so ive got nothing to worry bout.

btw - only on BE's and Extreme Editions can u raise the multiplier, but can u lower it on a standard cpu? tht seems to b the case in some reviews on toms, just confirming...

and also - DDR2-800/PC2-6400 is the ram ill be getting, and I'll b raising the FSB to at least 1066 and 1333 is likely; will i b getting any bootstrap issues?

http://www.tomshardware.com/reviews/ddr3-1333-speed-lat...

Thanks..
July 27, 2009 9:46:40 PM

The PII X2 550BE is significantly quicker than an E5300 at stock speeds, but I seriously doubt it could do better than trade blows once both are max OC'ed.

The Athlon 7750 is about equal to the E5200 stock, but will top out at 3.4GHz or less and gets creamed by an E5200 max OC'ed. At your prices, forget it. In case you care... I tested that one here: http://www.tomshardware.com/reviews/amd-cpu-overclock,2...

The E5x00's does not have virtualization, but given it's not a very long term system for you, doubtful you'll miss that.

Yes on the multipliers.... they are locked upward, but you can lower them. Many people seem to forget that and OC an E5200 at 12.5 * some wacko bus. On many a mobo that will work just fine, but I prefer to stick to 333 for the E5x00's, start with a low multiplier and work it up 0.5x at a time.

You won't have bootstrap issues as long as you change the jumpers on the Asrock mobo to adjust for DDR2-800 and FSB-1066 or FSB-1333. Look at the OC page of the $600 SBM article for details and a pic of the jumpers.


Good luck and enjoy! I'm getting swamped and may no be back to the forums for a while.
July 28, 2009 3:38:29 AM

virtualization? running 2 OSes? its fine, I don't need to.

Alright, ca b brought down... Hmm... good tactic... ill use it when i get it.

Alright, ok...

Thanks alot for all ure help, bro. Tc and good luck.
August 6, 2009 2:35:25 PM

guys, 1 thing; since ill b jacking up the FSB to 1333 Mhz, and ill using DDR2-800 / PC2-6400 RAM, won't I have an in-proportionate FSB:RAM ratio of something like 5:3, where my FSB runs 67% faster than my RAM?

wont that cause a bottleneck between CPU and RAM and slow down the system?
August 20, 2009 8:13:43 PM

Guys, I have news.

I BOUGHT THE CPU! AND THE MOBO and ram.

This is my new, current setup:-

Processor - Intel Pentium Dual Core E5300
CPU Cooler - Stock
Motherboard - ASRock G31M-S
RAM - 4 GB - DDR 2 - PC2 6400
Graphics Card - ATI Radeon HD 4670
Hard Drives - 250 GB
Power - 400 W

I OCed the CPU to 3.0 GHZ and it was stable.

I then changed the jumpers to a 1066 setting, and the FSB ran at a Frequency of 266, but it's unstable. I'm getting the "Blue Screen of Death" and Windows wont start.

I then set the FSB to 252 to run at 3.27 Ghz, and its stable.
I played Left 4 Dead for about 30 mins then checked the CPU Temp. and it was running at a very cool 50 Degrees Centigrade.

So, why wont it OC to 1066, and how do I do it?

Thanks.
August 20, 2009 8:58:00 PM

Make sure you lower the RAM ratio so you are not overclocking the memory.

At 252MHz FSB, what is your memory speed? Check it with CPU-Z. http://www.cpuid.com/cpuz.php

Is the mobo an Asus or an Asrock ? If it's an Asrock G31M-S, what jumper did you change?

August 20, 2009 9:31:07 PM

The starting point is to get a FSB-1066 stable first. You do this with little or no CPU OC and no memory OC. SO lower the mem ratio and the CPU multiplier when first attempting the higher FSB. (edit: If you don't lower the CPU multiplier, you are trying 266*13, which is way too high on stock voltage)

My suggestion is 10*266 (2.66GHz) and DDR2-800. Then try 10.5 * 266, 11*266, etc until you lose stability. At this point, the CPU will need more voltage to continue.
August 20, 2009 9:45:33 PM

- I dont think i can lower the RAM Ratio... i searched in the BIOS, couldnt find anything for the RAM Ratio...

- Sry, my bad, ASRock, not Asus... ill edit the above...
I read the manual and I changed the "OC 800" jumper from Pins 1 and 2 TO pins 2 and 3. This is what the manual instructed to do if I wanted to run a 800 FSB CPU to 1066.

- Alright, ill start testing it the way u said. "10*266 (2.66GHz) and DDR2-800. Then try 10.5 * 266, 11*266, etc".
What is the Maximum Voltage i should go for?...

- BTW, how do I tell how fast the RAM is actually running at by using CPU-Z?
In the "DRAM Frequency" under "Timings" in the "Memory" Tab?
and ATM my FSB: DRAM ratio is 2:3, so says CPU-Z.
August 20, 2009 9:53:44 PM

1 - even though ive told the RAM to function at 400 Mhz, CPU-Z tells me its running at 378.
2 - I cant adjust the multplier in my BIOS.
3 - I just tried to boot it at 13*254=3302, but is woudlnt boot windows. I think it may be cause of the Voltage, but i dont ahve the option to increase it from the CPU section in the BIOS.
In the Chipset settings, though, i have"-
- DRAM Voltage. (i know thats for RAM)
- NB Voltage.
- VTT Voltage.
- +1.5V Voltage.

I think the Vcore voltage is the VTT Voltage, am correct?
August 20, 2009 10:10:02 PM

Yes, DRAM Frequency under the memory tab. in your case, it will say 400 MHz for DDR2-800 or 333 for DDR2-667.

OK, yes that jumper should do the trick.

Before you change the jumper though, you should knock down the CPU multiplier or it may not boot. If yours even successfully made it to the BIOS at 13*266 (@ stock voltage), you have a good chip. Many E5x00's will top out below 3.0GHz stability at stock voltage, and wouldn't boot without lowering the multiplier (or adding voltage).

Find the max it will do at stock VID before increasing voltage. What does CPU-Z say VID is for your chip?

On the mem, when you set it to 400MHz (DDR2-800) it will only run 400 MHz at normal FSB like 800(200), 1066(266), etc. AT 252MHz , it will be lower than 400MHz (when you moved the jumper for a 1066 chip), or way above 400MHz if you just OC'ed without changing the jumper.
August 20, 2009 10:15:46 PM

but i cant change the multiplier in the BIOS, nor it seems, the VCORE voltage...

should i try using the ASRock OCing Utility? maybe from there i can increase the Vcore or change the multiplier...
August 20, 2009 10:18:14 PM

For now don't mess with varied FSB like 254 *13, just get 266 (FSB-1066) stable. How high did you get at going 266*10, 10.5, 11, 11.5, etc.? Stability test with prime 95 small ftt test. If you do this in increments, and it's stable, it will usually boot fine with a .5 multiplier bump. This can save you major headaches.

What are the selectable ranges for VDD? Does it say CPU VDD, FSB VDD, or just VDD?

!