Undervolting
Since we have now created practically optimal conditions with a reasonably potent test system, the current drivers and activated SAM, it was now a matter of optimizing the card itself a bit. Undervolting has hardly been as effective with any other graphics card as it is with Vega. And because the cards were not yet completely locked, as is unfortunately the case with the 7000 Radeons, you could still really let off steam here. With the Memory Tweak Tool you could even tune the timings of the HBM2 memory, but I don’t want to go that deep into the matter in this article.
With the help of the undervolting experts “Gurdi” and “RX480”, who can also be found in our forum, we had created a profile for a Vega 56 a few years ago, which still works perfectly today. The HBM2 memory could be brought from 800MHz to 900MHz – at 925MHz it starts to produce artifacts and I’d rather not push the old sweetie to the limit. We could effectively get about 200MHz more clock from the GPU with the settings and a total of more than 30W less consumption. All in all, we get a game clock of about 1500MHz core and 900MHz VRAM. The setting is far from “final optimized”, but it should be 1:1 applicable for most Vega 56 without any stunts.
In conjunction with the not exactly frugal 12-core, the entire system draws about 350W from the socket in demanding games – certainly not an energy-saver, but also anything but an electric heater!
By the way, the card also stays nice and cool. With fresh thermal paste and a clean cooler, the graphics card barely reaches 60°C with quite acceptable fan noise and due to the correct installation of the cooler, the hotspot with 70°C is absolutely no problem. Here is a log of a quarter hour gaming load:
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