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Old November 6, 2011, 08:41 AM
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Patriote Patriote is offline
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Originally Posted by keto View Post
OK, my finding from 2 different Z68 boards is that this chipset is VERY sensitive to memory settings. I'd be willing to place a small wager that you can get that stable, with less voltage. I suggest 1 of 2 things:

1) keep that 4.8 overclock, set your memory to 1333 speed, do your P95 and see if it still crashes. If not (I'm betting it wont), reduce voltage and repeat. THEN when you have established what your cpu will run, you go in and increase your memory speed a step at a time. Do NOT use XMP, at least not until you have tested right up to your rated speed. DO set all (or at least the 'big 5' like, 9-11-9-27-2T) memory timings MANUALLY don't let the system pull them auto. DO set your memory voltage manually.


2) Just go straight to setting memory timings AND voltage manually and retry. Again, don't use XMP but you can try manually setting the timings to the same as what XMP would set.

Over and above those 2 things, other settings to mess with:
DO enable cpu pll overcurrent protection.
DO raise cpu current capability to 140% - yes, it's red. Don't worry about it.
You can also raise vccio, stock is 1.05v, I run now at 1.15v, and 1.20v is the generally accepted 'max for every day' number.

It took me a while to figure this out (from trial & error, plus the experiences of others) but I was able to drop my voltage a lot on my cpu as it wasn't the cpu that was causing the crashes, but I thought it was and kept upping vcore. others have said, if you are seeing bench test max temps below 80C, you are fine. Thermal throttling for the cpu is 95C, so you have some headroom. Also, for *most people*, a bench test load is not indicative of what you will see in everyday usage, gaming and so forth. There's about a 15C difference for me, ie., if 70C is bench test load peak, when gaming I only see 55C.
Hi! Ok some updates...

I have been trying to find the lowest Vcore voltage for 4.5Ghz Prime95 Stable folowing your instructions and so far, nothing seems to be working!

Here is what I am trying out this morning.

PS: I actually just want to get a Prim95 Stable 4.5Ghz in case during summer it would get too hot running over that and that I had to drop CPU clocks as well as temps... Once I am done finding the right settings and so for 4.5Ghz Prime95 Stable, I will start to reach the Max I can while watching temps. At least I know my CPU can do 48x Multi! I actually might even hook the CPU under H20 in a near future.

I have tried setting 1.345v, 1.350v, 1.355v and 1.360v and all would make the comp post\boot but would not pass even 2 hours of Prime95 blend test even at 3.60v. Tho it latested longer at 1.360v, one of the threads would still fail giving me the error "rounded was expected at ...etc...". This morning I got mad and went ahead with 1.375v and I am now currently stress testing with Prime95 blend test.

Setting :

NOTE: I have ran 2h15 (2 Pass) of Memtest86+ at stock clocks 1600Mhz, 1.50v manual set and 9-9-9-24 2T manual set yesterday to see if my RAM had any problems which would be the reason why Prime95 blend test would fail and it returned no errors at all. Hell, I even ran 6hours of Prime95 blend test with the CPU and RAM at stock clocks to see if it would fail and It didn't! So the RAM is surely not the problem here!

Also, there is one thing I am wondering... I saw on the net that my ram was XMP 1600mhz 9-9-9-27 ... Does that means that those settings are not the stock settings?
- Asus P8Z68-V PRO
- Intel I5 2500k @ 4.5Ghz
- Asus Geforce 580GTX DirectCUII Fermi
- 16GB Corsair Vengeance Low Profile
- Ultra X3 1000 Watt
- Asus Xonar DX 7.1 \ Klipsch Promedia 2.1 THX
- Corsair Vengeance 1300 Gaming Headset
- Crucial M4 SSD 128GB \ WD Caviar Black 1TB
- CoolerMaster 690II Advanced
- Dell UltraSharp 24''
- Noctua NH-D14

Last edited by Patriote; November 6, 2011 at 10:24 AM. Reason: I FAIL at typing with too much coffee Lol!
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