There's a good chance a different Pulse card would have performed better than what we've shown here.įinally, we have to look at temperatures and noise levels as a linked pair. We've since returned the card to the company, but other sites' results don't seem to corroborate with our results. Looking at these results, we can't help but wonder if our Sapphire card was a bit of a lemon. The clocks drop quite at bit at 4K, where the reference card still averaged 2494 MHz, but the Sapphire card dropped to just 2290 MHz. The Sapphire model meanwhile only averaged 2488 MHz, 38 MHz above its advertised speed. With the reference RX 7900 XT, across our 15-game suite, we measured average GPU clocks of 2573 MHz - 173 MHz above the advertised boost clock. But we know from experience that AMD's latest generation GPUs are likely to exceed that conservative boost clock. On paper, it has a higher 2450 MHz boost clock while the reference card 'only' has a 2400 MHz boost clock. And that's where things get a bit interesting with the Sapphire RX 7900 XT. GPU clock speeds on their own don't mean too much, unless you're comparing within the same architecture and even GPU. Sapphire for its part managed to provide equivalent performance while drawing more power, which definitely isn't the best way of doing things. We may never know for certain, but certainly there's room for improvement from AMD. There's also the question of how much extra power AMD had to use by opting for GPU chiplets instead of a monolithic die. It seems like Nvidia's architecture is overall simply more efficient. Now, they're basically on the same 5nm-class node (TSMC 4N and N5, for Nvidia and AMD, respectively). Part of that was because Nvidia used Samsung 8N (a 10nm-class node) while AMD used TSMC N7. If you look at RDNA 2 and Ampere, the previous generation GPUs, AMD generally held an advantage in efficiency. This is an ongoing issue with AMD's RDNA 3 architecture. Nvidia's RTX 4070 Ti meanwhile needed just 246W on average at 1440p, and 262W at 4K. In both cases, the Sapphire card averaged 322W of power use, while the reference card used 307W and 308W. The Sapphire RX 7900 XT does as advertised and uses slightly more power across our test suite than the reference 7900 XT, at both 1440p and 4K.
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