Overclocking 2500k setting correct

a giant fox

a giant fox

a giant fox

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Joined
21 Feb 2011
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137
Location
Darford, Kent
Hi guys

Just upgraded to sandybridge and been reading a lot of guides but found a guide on youtube that was for my cpu and the same board:

http://www.youtube.com/watch?v=sgiqzAKy6Tk

Managed to get a stable overclock at 4.5 fine and tested fine with primer and Intel burn, only concern was under intelburn temps were hitting 80c on 1.3 vcore.

Managed to lower Vcore to 1.275 which lowered temps down to 75c, I just wanated to check if what the video suggests are good setting and if their is anything I can change to lower temps, i'm running on air with normal cm case fans and 2 eagles venting out top and 1 side on GPU level blowing in.

Video Guide suggests:

CPU phase control: disabled
Adjust cpu to 45
DRAM freq to DDR3 1666mhz
DRAM TIMING MODE: linked
Change DRAM config to: Command rate 1T, tCL 9T, tRCD 11T, tRP 11T, tRAS 24T, tRFC 90T.

Speed Spectrum disabled
VDROOP control: low Vdroop

CPU core voltage: 1.3
CPU I/O voltage: 1.210000

DRAM voltage: 1.594

C1E support: enabled

Does all this look right?
 
Whats your Dram voltage set at in bios? Do you really need to run it that high.
I thought the sandybridge CPU,s shouldnt really be ran at over 1.5 Ram voltage.
 
The RAM voltages shouldn't affect my CPU temps, I have been reading other guides and the guide on here from the official oc sandybridge thread has this quote:

Memory - Intel recommend 1.50v plus/minus 5% which means 1.60v is the ideal safe maximum, but we have found in our testing all 1.65v memory is fine. We have also found most new 1.65v like Corsair XMS3 will run at its rated timings with just 1.50-1.55v which is well within Intel specifications. So people upgrading to Sandybridge you can still use your old DDR3, but we do recommend you run it at 1.60v or less. We are shipping most of our bundles which feature Corsair XMS at 1.50v-1.55v at rated timings. We've also discussed with Asus and MSI regarding voltages for memory and they also confirm in their testing 1.65v caused no issues with reliability.

This states up to 1.65v is fine for ram but as I said my RAM is fine what I want to know is the setting I have adjusted are these all correct and is their anything I can tweak to lower my top end cpu temp of 75C.

I don't think I can stay at 4.5 and lower vcore anymore as when running intelburn at very high their was a couple of big differences in the Gflops, which I think can indicate possible instablity in system if anyone can confirm?
 
a giant fox said:
The RAM voltages shouldn't affect my CPU temps, I have been reading other guides and the guide on here from the official oc sandybridge thread has this quote:

Memory - Intel recommend 1.50v plus/minus 5% which means 1.60v is the ideal safe maximum, but we have found in our testing all 1.65v memory is fine. We have also found most new 1.65v like Corsair XMS3 will run at its rated timings with just 1.50-1.55v which is well within Intel specifications. So people upgrading to Sandybridge you can still use your old DDR3, but we do recommend you run it at 1.60v or less. We are shipping most of our bundles which feature Corsair XMS at 1.50v-1.55v at rated timings. We've also discussed with Asus and MSI regarding voltages for memory and they also confirm in their testing 1.65v caused no issues with reliability.

This states up to 1.65v is fine for ram but as I said my RAM is fine what I want to know is the setting I have adjusted are these all correct and is their anything I can tweak to lower my top end cpu temp of 75C.

I don't think I can stay at 4.5 and lower vcore anymore as when running intelburn at very high their was a couple of big differences in the Gflops, which I think can indicate possible instablity in system if anyone can confirm?
Click to expand...

When checking for instability, I usually just run Prime95 on blend test for a good 8+ hours. If none of the cores fail, you're pretty much good to go.
 
a giant fox said:
The RAM voltages shouldn't affect my CPU temps, I have been reading other guides and the guide on here from the official oc sandybridge thread has this quote:

Memory - Intel recommend 1.50v plus/minus 5% which means 1.60v is the ideal safe maximum, but we have found in our testing all 1.65v memory is fine. We have also found most new 1.65v like Corsair XMS3 will run at its rated timings with just 1.50-1.55v which is well within Intel specifications. So people upgrading to Sandybridge you can still use your old DDR3, but we do recommend you run it at 1.60v or less. We are shipping most of our bundles which feature Corsair XMS at 1.50v-1.55v at rated timings. We've also discussed with Asus and MSI regarding voltages for memory and they also confirm in their testing 1.65v caused no issues with reliability.

This states up to 1.65v is fine for ram but as I said my RAM is fine what I want to know is the setting I have adjusted are these all correct and is their anything I can tweak to lower my top end cpu temp of 75C.

I don't think I can stay at 4.5 and lower vcore anymore as when running intelburn at very high their was a couple of big differences in the Gflops, which I think can indicate possible instablity in system if anyone can confirm?
Click to expand...

Ah! might just pump 1.6v through mine then and clock the hell out of my memory.
 
Ok update

Tried 1.3 vcore again and pushed my CPU a bit harder. Tried 4.7 but after 1 min of intel burn BSOD with msg about processor failed. Lowered to 4.6. ran intel burn for 10 cycles but 2 of my cores were going above 80c so not sure if want to stay at this temp. Ran Primer 95 for an 1 hour on small fft's and highest temp was 74c. Think I have hit my wall for cpu unless I can improve cooling.

Anyone know anything else I can adjust to lower temps but keep 4.6, I know Speed Spectrum can be disabled and sticking to low Vdroop as vcore doesn't change in big differences under load.
 
BeQuiet Dark Rock Advanced

http://www.overclockers.co.uk/showproduct.php?prodid=HS-001-BQ&groupid=701&catid=57&subcat=1395

Great cooler, has been tested on a lot of websites and gets very close to silver arrow and frio performace by about 5c, however brought it as it is so much quiet then any other high end air cooler on the market:

http://www.bit-tech.net/hardware/cooling/2011/03/18/be-quiet-dark-rock-advanced/2

The weird thing is I can't understand why my temps are so high, using bit-techs example, I have same board and saem oc on same vcore, yeah their using a i7 cpu but their temps are like 25c less then mine?
 
a giant fox said:
BeQuiet Dark Rock Advanced

http://www.overclockers.co.uk/showproduct.php?prodid=HS-001-BQ&groupid=701&catid=57&subcat=1395

Great cooler, has been tested on a lot of websites and gets very close to silver arrow and frio performace by about 5c, however brought it as it is so much quiet then any other high end air cooler on the market:

http://www.bit-tech.net/hardware/cooling/2011/03/18/be-quiet-dark-rock-advanced/2

The weird thing is I can't understand why my temps are so high, using bit-techs example, I have same board and saem oc on same vcore, yeah their using a i7 cpu but their temps are like 25c less then mine?
Click to expand...

Not sure if i am right, but aren't the temps on bit-tech basically degrees C ABOVE ambient temp? (AS they word it " The temperatures shown are the delta T between ambient and CPU temperature.")

i.e your room temp = 25c + 53c under load = 78c under load.
 
Going to bump my own thread, anyone know if what Jonny said is correct:

jonny512379 said:
Not sure if i am right, but aren't the temps on bit-tech basically degrees C ABOVE ambient temp? (AS they word it " The temperatures shown are the delta T between ambient and CPU temperature.")

i.e your room temp = 25c + 53c under load = 78c under load.
Click to expand...

Does anyone else have my cooler in sig cooler and what are their temps like, mainly as my temps aren;t as good as expected, I'm running at 4.5 now, vdroop low and have managed to push vcore down to like 1.260, under primer 95 vcore tops out at 1.304 and temps don't go above 65c after 2 hours, is this expected for high end cpu coolers on sandybridge at this voltage?
 
Ill bump for you too.

I'm still not positive if i am right about the + ambient temps, but if i am wrong this means:
According to the link you post about cooler performance, an i7 clocked @4.6 with a stock cooler only gets to 69c. If this was the case none of us would need custom cooling. It is more likely to be 69c + the ambient temperature of say 25c = 94c which sounds about right for 4.6 on a stock cooler (SMOKIN!!)

Personally i think @4.5 and max temps of 65c after 2 hours of Prime95 is very good. i read somewhere that Intel say you should avoid going over 72c although some of the experienced over clockers hear seem quiet comfortable up to 80ish during testing. From what i have seen Prime95 will get higher temps than you will manage to get in general computer/gaming use anyway (maybe a few exceptions here). So i would be happy at 65c. If you dare you could maybe push for 4.6 and still be under 72c, although i doubt anyone can notice a big performance difference in real world use between 4 and 4.6.
 
Thanks Jonny

Decided to reseat my cooler last night after discovering I have made a huge mistake that may have contributed to my high temps. I had seated my cooler as if the fan on the cpu blows away from the heat pipes facing upwards as if it was taking hot air away. On closer inspection this fan is an intake fan duh.

Due to the mb and back plate position, (stupid coolermaster case), I can't reach the bottom screws without modding my case. Had to remove whole mb to reseat cooler, applied some new thermal grease (MX-3) and did a bit of cable management as well as clean all my case fans of dust, much better now.

Given up on 4.6, the trade off for volts required and the gain from 4.5 isn't worth it, now trying to push volts down as low as possible but maintain 4.5.

Was testing last night, currently got down to 1.240, with low vdroop most vcore got under 1 hour of primer 95 with small ffts was only 1.280 (can't find LLC in bios so I can have vcore I want, if anyone knows where it is on my mb, please let me know).

On this setting temps didn't go above 62C, gonna try and get as low as possible and then test with a few hours of Crysis on highest setting
 
a giant fox said:
Was testing last night, currently got down to 1.240, with low vdroop most vcore got under 1 hour of primer 95 with small ffts was only 1.280 (can't find LLC in bios so I can have vcore I want, if anyone knows where it is on my mb, please let me know).
Click to expand...

Please also use Prime Blend for stability - Between 4-8 hours should be enough.
 
Damn you Beh, decided to run on blended and if fell over straight away lol, put voce up to 1.280, doing quite well, vcore is topping out at 1.312 but my temps aren't going above 60C after 30 mins, gonna leave for the next couple of hours the update.
 
a giant fox said:
Damn you Beh, decided to run on blended and if fell over straight away lol, put voce up to 1.280, doing quite well, vcore is topping out at 1.312 but my temps aren't going above 60C after 30 mins, gonna leave for the next couple of hours the update.
Click to expand...

It's allot better than it falling over in a clan match, encoding project or university project. In all honesty I fell into the same trap when I got my SB. 15 mins of IBT, up the multiplier - BSOD - up vcore etc etc. The problem is, IBT, Prime Small FFTs, Lynx do not seem to be that effective with these chips. Since getting Prime Blend stable I have not one crash!
 
Never sure what is the best test to run to be honest, intel burn on very destroys my temps but never sure if its a true test for day to day gaming.

Update looks, good at 1.280 vcore, ran blended for 3 hours and highest temp was 63C, going footy now, will probs lower vcore to 1.260 and try again.
 
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