It removes a bit of headroom, but it will improve performance.Īdding the fully unlocked factory overclocks into the mix, and we find that throttling is further reduced. This means that the RX 580 and RX 570 should be running closer to their maximum clockspeeds more often.
To be clear, they still throttle, but the average degree of throttling across our game set is lower than with the earlier cards. Radeon Video Card Average Clockspeedsīesides supporting higher clockspeeds overall, the higher TBPs of the RX 580 and RX 570 mean that these cards power throttle less often than their predecessors. In practice, both the RX 480 and RX 470 regularly power throttled to a small degree this allowed AMD to keep the cards closer to their optimal point on the clockspeed/power curve. 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.
RX580 POWER CONSUMPTION PLUS
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.
RX580 POWER CONSUMPTION FULL
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 always, last but not least is our look at power, temperature, and noise.
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