Functionally speaking, AMD’s boost mechanism is closer to a fine-grained throttle mechanism: the card always tries to run at its full, advertised boost clock, and will pull back if there’s not enough power available or it triggers thermal throttling. Moving on, let’s take a look at average clockspeeds. This has a minimal impact on a desktop card (especially wall power measurements), but if this is consistent for all AMD chips, it bodes well for the laptop-focused Polaris 11 and Polaris 12 GPUs. Our RX 400 series cards idled at 0.8v, whereas the RX 580 and RX 570 idle at 0.7625v and 0.725v respectively. On the plus side, idle voltages are down for both RX 500 cards.
As a result the highest frequencies on these two cards are very expensive in terms of power, and it explains a great deal about why AMD needed to increase TBPs by 30-35W just to add another 40-80MHz to the boost clock. Overall voltages have increased by around 0.1v when using AMD’s reference clocks, and closer to 0.15v for the full factory overclocks. Relative to both our RX 480 and RX 470, the differences are quite significant. AMD RX Series Video Card VoltagesĪs you can likely infer from the earlier discussion on power consumption and TBPs, in order to reach these higher clockspeeds AMD and their partners had to increase their GPU voltages. All things considered, a loud card is undesirable unless there’s a sufficiently good reason – or sufficiently good performance – to ignore the noise. Next to price and performance of course, these are some of the most important aspects of a GPU, due in large part to the impact of noise. as is? Do I need to change anything else other than the state voltages?Īnd for evaluating performance, is clock speed something I should mainly be looking at? What are the optimal levels I should be aiming to reach by the time I reach the lowest voltages I can?Īny tips would be appreciated, thanks in advance.As always, last but not least is our look at power, temperature, and noise. For example, should I keep things like power/temp limit, frequency, etc. I guess the two things I need advice on is how to properly monitor my increase/decrease in performance, and if I need to make any other changes when undervolting. I've lowered it down twice now (around -20 each time), and I can tell that the games feel more stable in FPS and fan noise, but the temps are still reaching around 81-82C. I've been using the Heaven benchmark, but I've mainly been playing demanding games to test the GPU's stability. I'm using MSI Afterburner (because I liked their OSD), and my current voltage changes are as follows: I've been getting upwards of 85C in demanding games, and the fan noise was too loud for my liking. I'm new to undervolting/PC building in general, and I'm trying to figure out how to properly undervolt my RX 580.
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