E6850 Overclocking Results and some confusion

Genison

Member
Jul 10, 2007
35
0
61
Well, I have to say that I really, really like this rig so far. I think I shot for the sky thinking 4 Ghz was possible on air cooling, but I am still trying to see what more I can get out of this thing. So far, 3.6 Ghz looks solid, and I didn't have to adjust any voltage. I'm confused about the CPU-Z readings vs. the BIOS. I don't know which is correct. Let me first give you some examples of my tests:

Overclock Settings and results:
Worked: 9 x 360 Mhz = 3240 MHz, vCore set to Auto, CPU-Z reports 1.405 vCore, Mem @ 576 Mhz

Failed (Locked Windows): 9 x 400 Mhz = 3600 MHz, vCore set to Auto, Mem @ 640 Mhz

Worked: 9 x 400 Mhz = 3600 Mhz, vCore at Manual..."Normal" setting, CPU-Z reports 1.296 vCore, Mem @ 540 Mhz

Worked: 9 x 400 Mhz = 3600 Mhz, vCore at Manual-Normal again, CPU-Z reports 1.296 vCore, Mem @ 640 Mhz

Failed (No Post): 9 x 425 Mhz = 3825 Mhz, vCore at 1.325, Mem @ 510 Mhz

Failed (No Post): 9 x 415 Mhz = 3735 Mhz, vCore at 1.310, Mem @ 510 Mhz

Failed (Windows Locked): 9 x 415 Mhz = 3735 Mhz, vCore at 1.325, Mem @ 510 Mhz

....skip ahead in tests a bit...

Failed (Orthos Failed): 8 x 475 Mhz = 3800 Mhz, vCore at 1.3562, CPU-Z reports 1.328 vCore, Mem @ 570 Mhz

Failed (Blue Screen): 8 x 475 Mhz = 3800 Mhz, vCore at 1.3625, CPU-Z reports 1.344 vCore, Mem @ 570 Mhz

Failed (Windows Locked): 9 x 425 Mhz = 3825 Mhz, vCore at 1.375, CPU-Z reports 1.344 vCore, Mem @ 510 Mhz


Sorry for all that, but it leads to some questions if any other Gigabyte P35 owners can contribute.

- Why is CPU-Z reporting a different voltage? If it's correct, why did the motherboard set at Auto ramp the vCore up so high (see first test)?

- Does my memory speed sound right? Supposedly, I had it as high as 640 Mhz (in CPU-Z) and it was working under that setting (without Auto voltage on).

- I know I jumped around a bit, but I think I've hit a deadend on 3.6 GHz. Unless I can trust CPU-Z that the voltage isn't as high as the BIOS says and keep going up.


Thanks for any thoughts.
 

cmdrdredd

Lifer
Dec 12, 2001
27,052
357
126
BIOS voltage settings lower when you get into windows and go down more at load. Depending on the board you can see anywhere from a .03v drop to .06v

Never leave your voltage on auto ever. Also set your memory at 1:1 if you want to eliminate that issue from your CPU stability testing. Make sure you give your memory the proper voltage it needs too. If it says 2.2v then set 2.2v in BIOS. Auto voltage can ramp up your voltage to unacceptable levels and kill your memory or your CPU or both.
 

firewolfsm

Golden Member
Oct 16, 2005
1,848
29
91
Leave your memory at 1:1 (It's called 2 in the BIOS) and relax the timings to 5-5-5-12 with a voltage of 2.1.

Raise the northbridge and FSB voltage by one step.

Start raising your FSB and see how high your processor can go, when you hit a wall (with acceptable temps) raise the voltage and try again.

After your CPU is maxed out try and tighten timings or lower other voltages to see what's best.
 

Genison

Member
Jul 10, 2007
35
0
61
That's been one of my problems. How do I see what the motherboard has the memory voltage set at currently in order to know how much to increase it? My memory is rated for 2.2V and the PC Health has always shown DDR18V as "Fail." This motherboard won't give me a current voltage for the memory.
 
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