AMD’s extended-awaited RDNA3 GPUs launched on Dec. 13, and whilst they didn’t score a knockout victory in excess of their rivals in early exams, they are obviously worthy rivals. Their main flaw, reviewers mentioned, was lackluster ray tracing performance, to the shock of precisely nobody. But now that the dust has settled and cards are in gamers’ palms, reports have surfaced on the net showing a selection of weird difficulties. The most troubling accuses AMD of delivery the Radeon RX 790 XTX with quite early silicon with disabled shader prefetch components.
The earlier mentioned is even now unverified at the time of this writing, but here’s what we know. The reports of odd behavior differ drastically, but the most egregious is becoming produced by a @Kepler_L2. They found a line in the Github submission for AMD’s drivers that showed a shader prefetch is not doing work for “some” playing cards with the A0 revision. This applies to 3 chips: CHIP_GFX1100, CHIP_GFX1102, and CHIP_GFX1103. That to start with chip is Navi31, aka the 7900 sequence. The 2nd chip is Navi33, which isn’t launched still. The third chip named is for APUs dependent on Phoenix, in accordance to Wccftech. That would mean AMD mounted this challenge for Navi32, aka Radeon RX 7800, etc. The A0 revision is early silicon, but in accordance to Kepler_L2, it was delivered to buyers. Twitter users are furiously making an attempt to determine out which cards aspect this revision of silicon, and how widespread it is.
Another user named Davidbepo posted a similar predicament with Navi31, the place an XTX card showed two distinctive steppings. In his tweet, the card is revealed in GPU-Z as currently being C8 stepping, whilst also applying A0 silicon. That is odd, as A0 would be the first revision of the components it must have superior for the remaining merchandise. It is attainable AMD transported early silicon with a broken shader prefetch in some cards. It is seemingly also not doing work in Nav33, the company’s midrange GPUs. This isn’t verified yet, either, but if it is legitimate, AMD would have to have to ship new silicon to rectify it.
Other studies demonstrate wildly fluctuating clock speeds. Twitter person @uzzi38 documented the XTX’s clocks can fluctuate concerning 2.4GHz and 2.9GHz with no options altered, which is very a distribute. They connected to Techpowerup’s performance benchmarks, which demonstrate an even wider stage of fluctuating clock speeds. In all those exams, the XTX displayed a 1GHz array of clock speeds, from 1,934MHz to 2,994MHz. Even even worse, their card ran at 1.6GHz in Furmark. We’re all made use of to GPU clocks various according to load and temps, but that is an unprecedented range in creation.
A tech YouTuber in the Netherlands named Nadalina identified comparable strange conduct on the Asus model of the XTX. She studies she ran Contact of Responsibility at 350fps and 2.9GHz, which ran it quicker than an RTX 4090. Nonetheless, an hour later it dropped to 300fps and 2.4GHz, with no changes to any options. Her GPU also manufactured some significant coil whine, but that’s why we have headphones we suppose. AMD graphics chief Frank Azor tweeted to her that the company would be in touch so they could attempt to figure it out, so it would seem like a little something strange is going on. And TechPowerUp also famous its XTX was consuming above 100W of power sitting at the desktop with a multi-keep an eye on setup, which is just weird.
This is all a thriller that we hope AMD can increase some clarity to. The A0 stepping could be fixed with a hardware refresh, but which is small consolation to present card proprietors. It’s been reported that the shader prefetch currently being disabled only triggers a fall in overall performance of 5 % with RDNA2. Provided how diverse RDNA3 is in terms of architecture, it’s unknown what influence that has right here. For now, we will have to wait to see if AMD chimes in.