Re: GPU CORE22 0.0.2 coming to ADVANCED - p11737 feedback th
Posted: Wed Jan 08, 2020 12:18 am
Now that I officially enabled the 'beta' flag,
Here's some of my initial overclocking/power capping findings:
- First off, Core 21 or Core 22 run pretty stable at the same power cap and overclock levels.
The initial WU that just abruptly failed, may have been the oddball, I haven't seen it repeated; and most of the beta WUs do seem to resume from last checkpoint.
- Core 22 gets approximately 40% higher PPD score at the same power cap.
The difference however, is that core 22 does the same job at a much lower core frequency.
Meaning, if my GPU has a peak boost frequency of 1935Mhz, and with Core 21 I overclocked and capped the power to run at ~1905Mhz, core 22 would run the same settings with 40% higher PPD, at ~1650-1675Mhz.
Meaning, I need to somehow increase the GPU boost frequency.
Since my overclock (+135Mhz) on the GPU is already set to the maximum stable overclock under core 21, this can only be done, by increasing power to the GPU.
And while my 2080Tis ran pretty close to stock PPD speeds, at a mere 160-169W on Core 21,
Core 22 requires me to increase the wattage (my initial settings are set to 190-195W). Which is close to stock wattage.
I haven't yet had the time to play around with finetuning on core 22. But I'm close.
This in turn increases PPD rating from 40% to around 60%.
- Increasing the wattage per card, will cause the overclock settings to cause failed WUs.
Eg: if my 2080 has a 135Mhz overclock, and runs stable at 1870Mhz, with core 22, increasing the power levels to 195W gets me ~1815Mhz, but I will have to reduce the overclock by a few Mhz (usually 5 or 10Mhz).
This is common even on core 21. When power levels are increasing, overclocking levels need to decrease. When power caps are in effect (and maximum power draw is reduced by 50-100Watts), stable overclocking can be increased (by a 10-25Mhz amount).
- Running higher wattage settings will result in hotter running GPUs.
Core 22 running at 55-59C up from 45-50C on Core 21; with a ~60% increase in PPD in FAHControl.
- If power caps are too low (eg: 125W on Core 22), I believe I saw the 2080Ti run the GPU into passive mode (800Mhz).
That number I saw on core 21 at 110W.
I may be mistaken here, but it may indicate that when the power cap is set too low, you might actually see a LOWER PPD rating on core 22 than on core 21; which could be one explanation on why some people see a reduction in points compared to core 21.
But this is not confirmed yet.
My next project will be to look into if it's worth running 4GPU system at lower power levels, vs 3GPU system with all GPUs running at their stock power levels.
I'm still in the test phase on them and hope the beta WUs will run for a while longer.
Here's some of my initial overclocking/power capping findings:
- First off, Core 21 or Core 22 run pretty stable at the same power cap and overclock levels.
The initial WU that just abruptly failed, may have been the oddball, I haven't seen it repeated; and most of the beta WUs do seem to resume from last checkpoint.
- Core 22 gets approximately 40% higher PPD score at the same power cap.
The difference however, is that core 22 does the same job at a much lower core frequency.
Meaning, if my GPU has a peak boost frequency of 1935Mhz, and with Core 21 I overclocked and capped the power to run at ~1905Mhz, core 22 would run the same settings with 40% higher PPD, at ~1650-1675Mhz.
Meaning, I need to somehow increase the GPU boost frequency.
Since my overclock (+135Mhz) on the GPU is already set to the maximum stable overclock under core 21, this can only be done, by increasing power to the GPU.
And while my 2080Tis ran pretty close to stock PPD speeds, at a mere 160-169W on Core 21,
Core 22 requires me to increase the wattage (my initial settings are set to 190-195W). Which is close to stock wattage.
I haven't yet had the time to play around with finetuning on core 22. But I'm close.
This in turn increases PPD rating from 40% to around 60%.
- Increasing the wattage per card, will cause the overclock settings to cause failed WUs.
Eg: if my 2080 has a 135Mhz overclock, and runs stable at 1870Mhz, with core 22, increasing the power levels to 195W gets me ~1815Mhz, but I will have to reduce the overclock by a few Mhz (usually 5 or 10Mhz).
This is common even on core 21. When power levels are increasing, overclocking levels need to decrease. When power caps are in effect (and maximum power draw is reduced by 50-100Watts), stable overclocking can be increased (by a 10-25Mhz amount).
- Running higher wattage settings will result in hotter running GPUs.
Core 22 running at 55-59C up from 45-50C on Core 21; with a ~60% increase in PPD in FAHControl.
- If power caps are too low (eg: 125W on Core 22), I believe I saw the 2080Ti run the GPU into passive mode (800Mhz).
That number I saw on core 21 at 110W.
I may be mistaken here, but it may indicate that when the power cap is set too low, you might actually see a LOWER PPD rating on core 22 than on core 21; which could be one explanation on why some people see a reduction in points compared to core 21.
But this is not confirmed yet.
My next project will be to look into if it's worth running 4GPU system at lower power levels, vs 3GPU system with all GPUs running at their stock power levels.
I'm still in the test phase on them and hope the beta WUs will run for a while longer.