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Memory clock speed affects PPD for core21 units

post #1 of 10
Thread Starter 
Just letting everyone know that memory clocks affect PPD for core21 units. In my testing on my 970's running at 5500mhz reduced PPD by ~50k vs running at 7010mhz. I was trying to reduce bad state errors and reducing mem didn't help at all.

In linux you have to flash a modded bios to change mem clocks as even with coolbits enabled you can't change mem speed in the p2 state.

@4thKor confirmed that increasing mem clocks also increases PPD in windows for core21. For windows you can use nvidia inspector to adjust mem clocks for p2 state.

I saw no measurable difference in PPD for core18 units when changing mem clocks.

Hopefully this helps everyone gain a little performance when crunching core21 units thumb.gif
post #2 of 10

I wanted to test the theory that OCing GPU memory can increase PPD with x21 WUs. To do this I'm first going to use an EVGA GTX 960 rig.
I'm been using PrecisionX to OC this GPU so I decided to try it first.

 

On the previous WU I started NVIDIA Inspector to monitor my OCing. I verified under load that the GPU Clock was at the offset I set and the Memory Clock was

running at the default 3505 MHz.


Now with a memory offset of +50 MHz NVIDIA Inspector shows that the load memory clock is 3005 MHz. It does show that Memory was set to 3555 MHz.
When I dig down into PrecisionX it also shows memory running at 3004 MHz.


I guess my next move will be to set this GPU up to OC with NVIDIA Inspector tomorrow and see if I have better results.

 

My NVIDIA Inspector

 

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post #3 of 10
Thread Starter 
Maxwell cards run in the p2 state when running compute software. Precision X, Afterburner ect can change core clocks for both p0 and p2, however they can only change mem clocks for p0. Nvidia inspector can change mem clocks in the p2 state.

Edit:
I looked closer at your screen shot, make sure to select p2 state in nvidia inspector when you are making adjustments.
Edited by bigblock990 - 11/16/15 at 1:39pm
post #4 of 10

I didn't see your 'Edit about P2' before I OC'd my GTX 950 using NV Inspector.

 

 

I uninstalled PrecisionX, booted and did the OC shown above.

You'll notice that it shows P0.

 

My memory did OC to 3348 MHz and the GPU Clock to 1525 MHz as I selected.

 

Do the NV Inspector's OC have to be reapplied after a restart?

 

Hopefully I'll be able to OC my GTX 960 around midnight!

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post #5 of 10
Any updates on your test results, @msgclb?
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post #6 of 10

I've got two test subjects, a GTX 960 and a GTX 950.

First, this is my NV Inspector current OC of my 950.

Unlike my 960, I don't have to set it to the P2 state to overclock the memory and I don't know why.

Oops!

I was just getting ready to send this when bells & whistles went off (something went off) on my 950!

I got a 'BAD_WORK_UNIT' at 28% and a new WU was started. I'm hoping it really was the WU.

 

 

Now here is the NV Inspector for my 960.

 

 

You have to click the 'Unlock Max' button to OC the GPU & MEM Clock. Notice the button now says 'Relock Max'.

 

I might have found my max OC with this 960 because I first used 1480 MHz for the GPU Clock and the folding client protested!

I lowered it to 1470 MHz and so far it's folding with no bad states.

It's currently running a P9206 x21 with a PPD of 124k and TPF of 0:09:30.

 

Anyway it's bedtime so I'll worry about this in the AM.

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post #7 of 10
I look forward to reading more about it. Thank you for your efforts.
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post #8 of 10
Hmmm, be interesting if mem speeds affect core 21s. May have to mess around with the 960 in my folder to see. Though, that is annoying that coolbits don't allow OC of RAM in P2 state. Seems it is time to learn how to do some BIOS flashing for GPUs.
     
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post #9 of 10
Oh, I missed this revolutionary post!
 
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post #10 of 10
Thread Starter 
They have updated core21 since I did this. Current version 0.0.17, and I think it was 0.0.14 when I was playing around with mem speed. They made some big changes, so maybe time for a retest thinking.gif
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