What is possible?
At times of the highest performance, both the RX Vega 56 and the RX Vega 64, get 1,2V and this is reached while under load. In reality it seems that the cards can get by with lower voltage too. Our RX Vega 64 appeared to run at 1070 mV at first, but after each of the games stabilised, it measured at 1090 mV usage. This is a 9% difference from the standard.
Later on, we will look at how considerably the performance improves while undervolting. But first we ask ourselves, why AMD sets such high voltage by default thereby limiting the performance of their products. A look through the fellow hardware testers’ websites gives a range of possible minimal voltages and it appears that no one had any issues lowering the voltage considerably.
We cannot imagine that AMD would not have a reason to set the default settings the way they do. It would seem that there are still some Vega chips that require the default voltage for stable performance in circulation. This does not change the fact that most Vega users can squeeze out some extra performance for free. We take a look at how much this is on the next page.