ASUS ROG STRIX Radeon RX Vega64 8GB OC Edition: Page 8 of 9

Posted by Damon Bailey on Monday, January 29, 2018 - 8:00am

Overclocking

We’ve done all of our performance testings on the ‘P’ performance Profile so far, but we’ll check out the Quiet profile as well here.

ASUS ROG STRIX Radeon Vega64 OC

This is booting up under the performance mode.

ASUS ROG STRIX Radeon Vega64 OC

This is the Quiet Mode. The only thing really evident here is a 5Mhz reduction in memory clock and results in about 3GB/s less overall memory bandwidth. In testing, we really didn’t see a difference in benchmark scores outside the margin of error.

We were able to push the HBM2 memory to 1180Mhz, and the GPU core speed to a shade over 1700Mhz with no direct issues or instability, but even a modest overclock causes temps to creep out of the green zone and to start throttling which hurt scores more than helping.

 

Power Draw and Temps

ASUS ROG STRIX Radeon Vega64 OC

We did see the quiet mode show a maximum ‘GPU only power draw’ reported by GPU-Z as 241W while Performance Mode peaked out around 286W at stock. Opening up the power target and pushing the clocks a bit jumped the power draw to a peak of about 360W.

The GPU’s core temps stayed under about 65C under load in all conditions, often around the 61-62C mark with the fans at about 50% speed. Our real issue overclocking came from the VRM temps shooting up quickly to the 100C+ range and causing heavy throttling of the card. With the VRM SOC temps above 100C, the core clock would fall back to around 1Ghz and the GPU memory would hover close to the 800Mhz mark while occasionally dropping to 500Mhz. If you leave it at stock, temps are quite good.

The front half of the card around the GPU core and HBM2 memory seems to have solid cooling, but the rear of the card around the VRM stages gets hot quickly under full load conditions if you start pushing the clocks. This really isn’t a design flaw made by ASUS, it's more of just trying to cram 350+ watts into something the size of a GPU. 

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