GA P67 UD4 sleep problem

[tgawn]

Having a few problems with my new build (2500k).
When i have the power saving features enabled and overclocked to 4.6Ghz, after i resume from sleep the cpu speed is stuck at 1600mhz. I cannot get it to ramp up again to full speed.
Now after disabling all the power saving features, when i resume from sleep i notice that core 3 fails after a few seconds of prime 95. Is fine from boot, but after resume from sleep it fails really fast.
Anyone have the same problem> 

[Dark Mantis]

Hi

I have a similar board the UD5 and haven't noticed the problem but then again I always have the power saving turned off and don't use sleep mode often. I will look into it tomorrow if I get the chance.

[tgawn]

It appears after observing the voltages readings on HW monitor, that when i resume from sleep the voltages run at their stock settings (not overclock), which i imagine are to blame for the prime95 test to fail. Hopefully this will be resolved with a bios update.

[Dark Mantis]

That does indeed sound feasible. For now it should be possible to switch the speed back to standard to give you stable performance across the board.

[tgawn]

For now i am avoiding the problem by not using the sleep function. This is pretty annoying as i would have the computer in sleep mode alot. I have submitted the problem to tech support to hopefully the issue will be sorted in a bios update. A quick google search shows im not the only one with this problem.

[Dark Mantis]

Please post again when you get a reply.

[Lsdmeasap]

This is probably caused by CPU PLL Overvoltages, this is disabled on resume from S3 so you probably can't reach the same multiplier as you could with it enabled before you put the system to sleep.

I am not sure if they will be able to fix this, or if it's an Intel Microcode fault?   It's been a known issue for a while, so it may be something they cannot address.

[tgawn]

I did a test with disabling the CPU PLL Overvoltages in the bios, but no change.
Thanks for the ideas, really hope this gets sorted.

[Dark Mantis]

I don't think disabling it will help your case anyway. If anything it needs to be enabled all the time to compensate but I don't know of a way to ensure that after sleep.

[Lsdmeasap]

Two things, first is your system 100% tested stable as you have it?   You must be 100% stable for S3 to even work

And second, disable CPU PLL Overvoltage is not going to help, this will cause your overclock to fail.   What I meant was since this gets disabled on resume from S3, you will need to use a lower CPU multiplier (Where you don't need CPU PLL Over), that way on resume from S3 it wont matter that the CPU PLL Overvolt has been disabled.

Some CPU's can do 42-45ish without it, others can do 46-50+ without it, you will just have to find the stable limit of your CPU without this setting enabled if you absolutely need S3 sleep for now.

[tgawn]

Ok so i am pretty certain i am 100% stable at 4.6Ghz, prime 95 for a good few hrs.
After about an hr of testing with different voltages and multipliers in the bios it looks like pretty much any adjustment to the voltages will reuslt in the sleep function being unstable. Stock has been tested and is fine, but anything else i cant resume at anything other that 1600mhz from sleep.
Such a pain as my system would be in sleep state most of the day usually.

[Dark Mantis]

I know it isn't perfect but can't you run your memory at 1600 if that is stable as the speed difference is negligable unless you are benching ?

[tgawn]

Its not my memory speed thats the issue, its the CPU. And to run the CPU at 1600mhz is a bit low
Anyways i tried downclockin the RAM and the voltage of RAM to make sure it wasnt the problem, but again, no luck, cpu locks at 1600mhz upon resume

[Lsdmeasap]

How high can you overclock the CPU without CPU PLL Overvoltage, what multiplier?

[tgawn]

Ok i have ran a more tests and come up with the following.
With PLL voltage enabled, i resume from sleep at CPU 1600 mhz if any overclocks applied

With PLL voltage disalbed i can run at stock speed, but voltage up as high as 1.37 and all normal
if i put the cpu speed up a bit say to 3.6ghz, fail
with Pll voltage disabled the system refuses to resume at anything above stock multipliers, just a black screen after i hit the power button.
at least with PLL enabled i can get into windows abiet at a CPU speed of 1600mhz