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OC'd Athlon XP

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April 17, 2007 1:44:39 PM

Can anyone tell me how far can I push my Athlon XP 1800 on stock vcore?Right now it's running @ 1.67 GHz but i'm wondering if I can push it any further.The thing is my motherboard doesn't allow me the alter the vcore so i'm stuck with 1,47 V.I did push it to 1.9 GHz but I got a little worried so I pushed it back to 1.67 although the temp readings didn'go above 45 degrees even after about 6 hours.I hope someone can give some advice

More about : athlon

April 17, 2007 2:19:32 PM

The biggest danger in overclocking is having to bump vcore to get the cpu stable at higher speeds. This causes heat, the number one killer of cpu's. If you can't bump your vcore, then there is little to worry about.
I don't know how far your chip will go, but as it is older and probably has a few hours on it, I'd guess a 30% oc would be good.
As long as your temps are within range, push it till it smokes, or quits.
April 17, 2007 2:33:56 PM

just keep pushing it until your system crashes, then lower it back to the last stable clockspeed. Check your temps for a while and run memtest and all that and if you dont see any problems thats your max OC


yeah what he said, as long as you dont increase your voltage you wont see huge temp increases which means you wont fry your system... theoretically anyway sometimes shit happens but you shouldnt have any problems.
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April 17, 2007 4:28:29 PM

I've seen a lot of AXP (Thoroughbred-B core) running fine at 2.3-2.5GHz with FSB 200 and Vcore 1.85V. The only thing you should care about is a good aftermarket cooler. If you want to raise Vcore on ANY Socket A board - take a look here http://www.ocinside.de/html/workshop/pinmod/amd_pinmod.html

Quote:
i'm stuck with 1,47 V.I did push it to 1.9 GHz but I got a little worried
There is NOTHING to worry about.

Quote:
the temp readings didn'go above 45 degrees even after about 6 hours
I've seen temps nearly 70C under heavy load, on these CPUs. Take a look at specs, they say 85C or 90C...
April 17, 2007 4:49:03 PM

Quote:
The biggest danger in overclocking is having to bump vcore to get the cpu stable at higher speeds. This causes heat, the number one killer of cpu's. If you can't bump your vcore, then there is little to worry about.
I don't know how far your chip will go, but as it is older and probably has a few hours on it, I'd guess a 30% oc would be good.
As long as your temps are within range, push it till it smokes, or quits.


Actually, I'd say the biggest danger to overclocking is running all your peripheral components, like your hard drives, PCI cards and graphics card, out of spec due to lack of an AGP/PCI lock, causing a much increased risk for data corruption and component failure.

If you want to be safe, I recommend only running your XP up to 140 fsb, giving you 1750MHz clock speed. That will put your PCI bus at 35MHz and your AGP bus at 70MHz, which is close to the edge of the safe range.

If your mobo supports the 333 fsb, your could also try jumping up to the 166 (333 double pumped) fsb , giving you a 2.0GHz clock speed, essentially making your CPU an XP 2400+. This will allow your PCI and AGP bus to be once again at their standard 33 and 66Mhz frequencies, making it a safe overclock. Some mobos even have a jumper for 133/166 bus selection, making it a very easy thing to try.
April 17, 2007 5:06:08 PM

Well, I don't remember an Athlon XP chipset for Socket A without proper FSB:p CI dividers. Even the oldest KT133 from VIA has it, and all the way up KT266/333/400. The same with SiS. NVidia Nforce2 has LOCKED PCI bus so it's not a problem at all.

But it's better to know exact CPU core/stepping and mobo maker/model, than guessing. So, hentai_no_baka, give us some facts :) 
April 17, 2007 5:31:07 PM

Athlon xp 1800+ thouroughbred B
Stepping B0
motherboard ECS K7VTA3 V1 (KT266)
BIOS V6.0A
This is what I got out of AIDA32 , hope it helps.
April 17, 2007 5:42:20 PM

i had my athlon xp 1800+ running on 166x10.5, i think the voltage was around 1.6 or 1.625. if your ram and mobo are good, you dont have to worry about it. just watch your temps!
April 17, 2007 5:56:55 PM

Take a look at the mainboard, don't believe in software and check version number. It's probably in the farthest left corner, near the last PCI slot. It's important, this model has not less than SEVEN different revisions with different chipsets!
April 17, 2007 6:06:51 PM

I checked the motherboard, it says K7VTA3 VER 6.0.
April 17, 2007 6:12:25 PM

Great! It has 333 FSB and DDR333. Your CPU has 11.5 multiplier, so your 1.9 GHz is 11.5 x 166 in BIOS, am I right?
April 17, 2007 6:15:30 PM

well actually it's 165 FSB (it doesn't go higher than that) and the speed is 1.897 ghz
April 17, 2007 6:18:19 PM

Check if you have the latest BIOS, it's 6.0C 2004/08/30, read it on the POST screen during bootup. Hit Pause eventually...
April 17, 2007 6:25:35 PM

nope, it's 2003 september 22
April 17, 2007 6:26:53 PM

Quote:
it doesn't go higher than that
Locate jumpers JP2 & JP3 on board, these are near the edge close to battery. These are 3-pin with Pin1 marked on board. Short pins 2-3 on both jumpers -- you will have FSB166 and UP!
April 17, 2007 6:38:59 PM

I would be doing it for nothing because the mobo doesn't have an adjustable cpu:ram ratio and the memory crashes at 339 mhz.So at about 170 I'm betting it won't boot.
April 17, 2007 6:49:15 PM

Not necessarily for nothing... If you change FSB for 166 your PCI and AGP will be definitely in their specs! Now they are at 41/82 probably, instead of 33/66...
April 17, 2007 6:49:28 PM

I don't wanna update the bios unless I no for sure the update will do what I need.
April 17, 2007 6:55:52 PM

Check this BIOS description. You will see support for newest (then) 166 MHz FSB CPUs. So if you want to go higher...
April 17, 2007 6:59:15 PM

And to make you feel more safe - I don't remember how many AXP I've overclocked and how many on this particular board, even with pin mods for higher multipliers and Vcore - it seems to me ages ago - but it was a lot! :) 
April 17, 2007 7:00:35 PM

thanks for the help dr kuli ,I'll give it a try as soon as I get the floppy working :D 
April 17, 2007 7:13:38 PM

You are welcome :)  It was nice ride for me, I feel younger. Also, did you try more relaxed RAM timings in BIOS? I don't believe, that 6 MHz (3 actually, it's DDR!) is the whole overclock for ANY DDR333...
April 17, 2007 8:12:21 PM

Quote:
Well, I don't remember an Athlon XP chipset for Socket A without proper FSB:p CI dividers. Even the oldest KT133 from VIA has it, and all the way up KT266/333/400. The same with SiS. NVidia Nforce2 has LOCKED PCI bus so it's not a problem at all.

But it's better to know exact CPU core/stepping and mobo maker/model, than guessing. So, hentai_no_baka, give us some facts :) 


LOL. It's not a question of "proper" dividers, it's about locks. As you stated, only the NForce2's really had locks. All of VIA's and SiS's chipsets don't to the best of my memory. Anything over 140 fsb without locks is asking for instability, unless a jump to the next supported fsb is made. The post you made later addresses this problem:

Quote:
Not necessarily for nothing... If you change FSB for 166 your PCI and AGP will be definitely in their specs! Now they are at 41/82 probably, instead of 33/66...


:lol: 
April 17, 2007 8:34:58 PM

OK, I wasn't specific enough. It all depends on mobo&BIOS, some boards have had implemented "straps" BEFORE reaching next normalized FSB value. I mean for 150 MHz it was 1/4 divider (37.5/75 PCI/AGP) but for 151 MHz it was already 1/5! I cannot remember how it was on ECS K7VTA3 v.6.0, so I preffered to be on safe side.

BTW I was running a lot of PATA HDDs/recorders and AGP cards on boards OCed with 37.5/75 without any problem. Even 41.5/83 wasn't a problem if it was no add-on PCI cards...
April 22, 2007 3:21:30 PM

I finally updated the bios and bumped up the fsb and now have 166 fsb and up.But when I ran prime 95 the aux temps reached 67 degrees after about half an hour.The cpu and motherboard temps are normal.So I ran prime 95 again with 133 fsb and the aux temps didn't go above 25.How dangerous is the high aux temperature?
April 22, 2007 5:47:06 PM

Most probably it's your PWM temp, nothing dangerous here, these chips are specified for at least 85C, some of them for above 100C. If you want to improve it, put some heatsinks on MOSFETs and PWM. Be sure to have well vented case.
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