Sign in with
Sign up | Sign in
Your question

Overclocking Limit. Core 2 series.

Last response: in Overclocking
Share
February 17, 2012 4:12:07 PM

my question applies for the core 2 quad and duo older cpus. Basically when overclocking a cpu what will limit the speeds first? If you take heat out of the equation that is. Lets say the mobo is rated at running fsb 1333mhz and my cpu is has fsb of 1333, which is limiting the acheivable speeds? Will a processor stop working after a certain (reasonble) point no matter the mobo limitations? my guess is the mobo bottlenecks it. For my mobo i can only add +3V to fsb, so this is what i think is limiting my overclocking. tho im pretty happy with my results. just kinda want to know why.


i was able to get a 1333 cpu on a 1333 mobo (it says 1066 on website, but after bios update and switching from 1066 cpu to 1333 cpu it runs) mobo to 1868. (thats Core 2 duo e8400 @ 4.2 ghz. stock = 3ghz)

core 2 duo e8400 (i got this in jan 2012 used for $75 good deal no?)

gigabyte GA-965P-DS3 bios f14

noctua nh-d14 <<------ kicks ass
a b K Overclocking
a b à CPUs
February 17, 2012 8:35:35 PM

Not considering heat, the Front Side Bus will be the key limit. It is difficult to find a board that will work at 550MHz. If yours will, reduce the CPU multiplier to 8 (cpu: 4.4GHz) or 8.5 (cpu: 4.675GHz, if you board has that option), and try that.

I don't know the current value, but $75 is better than when it became available - it was ~$275. I think you got a good deal, anyway.
m
0
l
February 18, 2012 2:21:46 AM

treefrog07 said:
Not considering heat, the Front Side Bus will be the key limit. It is difficult to find a board that will work at 550MHz. If yours will, reduce the CPU multiplier to 8 (cpu: 4.4GHz) or 8.5 (cpu: 4.675GHz, if you board has that option), and try that.

I don't know the current value, but $75 is better than when it became available - it was ~$275. I think you got a good deal, anyway.



ok so if there was a magical motherboard that had an infinity fsb then ignoring heat/memory limitations then the cpu could go higher? that is to say the motherboard limits acheivable cpu speeds via fsb limits on the mobo.

also im not running at 550mhz. im at 467. 467*4 = 1868. stock multiplier = 9. so 467*9= 4.2 ghz

thanks for the answer
m
0
l
Related resources
a c 105 K Overclocking
a c 227 à CPUs
February 18, 2012 2:37:53 AM

I had an E8400 from 2007 to 2011 and then sold it to a friend and it still runs great. From day 1 it was clocked to 4.050Ghz or 450FSB. This was on an EP45 UD3 motherboard with Corsair DDR2 800 cas 5-5-5-15. Running the RAM at a 1:1 ratio with the FSB overclocked the RAM to 900Mhz cas was left at 5. ZeroTherm Nirvana NV 120 cooler.

The chip was plenty cool and I could have pushed it higher but I wanted to make sure it would last. Great chip, I got my moneys worth out of it for sure.

The bad news with your setup is that older P965 board will probably not overclock as well as a P45 board. The chip will probably top out in the 4.2-4.4Ghz range with the right board.

In fact I also had a P965 DS3 with an E6600. It still runs today as well as far as I know at 3.4Ghz. I did not think the P965 would even work with a Wolfdale.
m
0
l
February 18, 2012 9:06:34 AM

anort3 said:
I had an E8400 from 2007 to 2011 and then sold it to a friend and it still runs great. From day 1 it was clocked to 4.050Ghz or 450FSB. This was on an EP45 UD3 motherboard with Corsair DDR2 800 cas 5-5-5-15. Running the RAM at a 1:1 ratio with the FSB overclocked the RAM to 900Mhz cas was left at 5. ZeroTherm Nirvana NV 120 cooler.

The chip was plenty cool and I could have pushed it higher but I wanted to make sure it would last. Great chip, I got my moneys worth out of it for sure.

The bad news with your setup is that older P965 board will probably not overclock as well as a P45 board. The chip will probably top out in the 4.2-4.4Ghz range with the right board.

In fact I also had a P965 DS3 with an E6600. It still runs today as well as far as I know at 3.4Ghz. I did not think the P965 would even work with a Wolfdale.


weird i just got the ep45 ud3 for another system for $45. with the new i7's older used stuff is going cheap. great for facebook/word processor users.

yea i got it higher, but it would sometimes freeze up. the mobo officially does not support a wolfdale, but with a bios update to f14 it will work. i bought these as a budget system for a friend. it took me a long time for it to be stable, and for some reason whenever i turn the thermal monitor off in the bios it wont boot. Im pretty sick of messing with settings and im happy with the results anyway.

What do you think about the p43 chipset? Im putting a core 2 extreme qx9650 in a GIGABYTE GA-P43T-ES3G. this board has ddr3 which with the price of ddr2 today is the reason i bought it. also the extreme was really cheap too. i even saw some core 2 quads going for higher than what i paid for the extreme on the bay. The price of the same ammount of slower ddr2 was almost the same as the mobo AND ddr3 1600 ram.
m
0
l
a c 105 K Overclocking
a c 227 à CPUs
February 18, 2012 3:35:59 PM

Yeah the Core2 chips have really retained their value. With DDR2 so expensive and decent LGA775 motherboards so hard to find now it is crazy not to go with a full upgrade. Especially since even the cheap Sandy Bridge chips are so fast.

The P43 chipset is decent. From what I remember the P45 and then the X48 ( although somewhat rare ) were the most solid overclockers.

I hate to think what you might have paid for a QX9650. Being an EE chip it should overclock fine with the P43 since you are not relying on the FSB to overclock it.
m
0
l
February 18, 2012 4:27:16 PM

anort3 said:
Yeah the Core2 chips have really retained their value. With DDR2 so expensive and decent LGA775 motherboards so hard to find now it is crazy not to go with a full upgrade. Especially since even the cheap Sandy Bridge chips are so fast.

The P43 chipset is decent. From what I remember the P45 and then the X48 ( although somewhat rare ) were the most solid overclockers.

I hate to think what you might have paid for a QX9650. Being an EE chip it should overclock fine with the P43 since you are not relying on the FSB to overclock it.


mabye i should have gone with an i7 but i paid $225 for qx9650 and $75 for the ddr3 lga775 mobo and that was my budget. to say that the core2 have retaind thier value id have to disagree. maybe some of the ones that came out latter havent dropped as much, but they werent nearly as expensive to start out as the earlier ones. i remeber paying ~300 for a e6600. now you can get one for $45. Too bad ddr2 is expensive now or you could build a really cheap pc.

i built a pc for a family member for $300 with a core 2 overclocked a little runs great for everyday aplications.
m
0
l
a c 105 K Overclocking
a c 227 à CPUs
February 18, 2012 4:57:24 PM

xxgdkxx said:
mabye i should have gone with an i7 but i paid $225 for qx9650 and $75 for the ddr3 lga775 mobo and that was my budget. to say that the core2 have retaind thier value id have to disagree. maybe some of the ones that came out latter havent dropped as much, but they werent nearly as expensive to start out as the earlier ones. i remeber paying ~300 for a e6600. now you can get one for $45. Too bad ddr2 is expensive now or you could build a really cheap pc.

i built a pc for a family member for $300 with a core 2 overclocked a little runs great for everyday aplications.



Seriously you paid $300 for a QX9650 and motherboard??

Gigabyte Z68 Sli/Crossfire capable motherboard $130.

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

i5 2400 $190

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Total $310.

http://www.anandtech.com/bench/Product/49?vs=289

On a Z68 board the 2400 can be overclocked via the Turbo Boost function 4 bins over stock. So basically from 3.1 to 3.5Ghz and max Turbo from 3.4 to 3.8Ghz.

The 2400 even beats a QX9770.

http://www.anandtech.com/bench/Product/48?vs=363

You could have had an i5 2500K and motherboard for $350.
m
0
l
February 18, 2012 6:02:31 PM

anort3 said:
Seriously you paid $300 for a QX9650 and motherboard??

Gigabyte Z68 Sli/Crossfire capable motherboard $130.

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

i5 2400 $190

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Total $310.

http://www.anandtech.com/bench/Product/49?vs=289

On a Z68 board the 2400 can be overclocked via the Turbo Boost function 4 bins over stock. So basically from 3.1 to 3.5Ghz and max Turbo from 3.4 to 3.8Ghz.

The 2400 even beats a QX9770.

http://www.anandtech.com/bench/Product/48?vs=363

You could have had an i5 2500K and motherboard for $350.


meh hopefully ill be able to overclock the qx9650 higher than 3.8. and im not sure why they would test both those at stock speeds when both are made for overclocking... but with the extra $50 i can buy either 50 $1 tacos or 1 $50.

if i remember ill post some results when everything is setup. im planinng on increasing fsb to 1600 then increasing multiplier.

p.s. try not to be such a dick its not very cool :) 
m
0
l
a c 105 K Overclocking
a c 227 à CPUs
February 18, 2012 6:39:17 PM

Since the Sandy Bridge chip is about 30% faster clock for clock than the Core2 architecture you better hope it hits 4.5Ghz to equal the i5.

And I was not not being a dick. It's not like I flat laughed in your face for pissing away your money on dead tech. I mean Moore's law and it's not 2007 anymore and all that.

I'm sure you might even find one or two people in a hole somewhere who have built a computer before who think that spending $300 on an LGA775 chip and motherboard is a smart idea for a new build. Maybe. Somewhere.

If I find them I'll be sure to send them your way to applaud your savvy business acumen. ;) 
m
0
l
!