So I was experimenting and fine tuning my GPU further.
One of the concerns in the past was the binding of the VRAM and VRM to the water block because the standard pads that EK provides with the GPU are 3.5W/m·K.
I have ordered EC360 Silver which are 12 W/m·K (1mm pads).
See the before and after photos from the GPU below.
I also replaced on the backplate EK pads with EC360 (1.5mm und 2mm).
For GPU chip I used as usual Thermal Grizzly Kryonaut.
The hotspot remains as expected after rebuild in the same range.
Max hotspot in Time Spy was always in range of 69°C-70°C.
Now I can push with more peace of mind the Core power draw towards 340W total.
I don't have unfortunately a Thermal Camera to compare the temperature difference on the PCB.
I did see that now HWiNFO has in the recent versions added Vcore Temperatur measurement
(GPU VR VDDC Temperature).
This is hotspot temperature of the Vcore. There is 10-phase VCore on the reference 6800XT card.
These power stages are from International Rectifier TDA21472 DrMOS and are rated to -40°C to 125°C.
Max temperature reading is 50°C for me under Benchmarks.
What I also noticed is that for some reason coil whine is now better after I changed the pads.
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Here are my actual Benchmark results for the 6800XT with driver 21.3.2.
Some increase with new driver.
With new result, I hit the third place in Leadership board for Time Spy und Port Royal sorted for GPU score for 6800XT with 5800x processor.
I could increase setting from 2745MHz@1020mV to 2750MHz@1020mV without crash. It used to crash before.
Port Royal:
Search (3dmark.com)
Time Spy:
Search (3dmark.com)
Result with 21.3.1 are here:
I'm not quite sure what to make of stability because TS and PR seem to require different settings for optimum performance. Time Spy likes high clock rates, while Port Royal hates it, at least in my case. Anyway, here are my results.
www.techpowerup.com
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