AMD launched its first RDNA 3 graphics playing cards, the $1,000 Radeon RX 7900 XTX and the $900 RX 7900 XT. Because the numbering scheme and value factors present, these are high-end fashions designed to compete with Nvidia’s RTX 4090 and 4080, however they arrive with extra substantial modifications than you may count on – together with the FSR 3 designed in opposition to Nvidia’s DLSS 3 body technology, and model new a chip-based design.
Earlier than we get into the options, let’s check out the playing cards themselves. The chip design separates the normal unibody GPU into a number of interconnected sections. For RDNA 3, this can be a single 300mm² 5nm graphics computing die (GCD) and 6 6nm reminiscence cache dies (MCDs) 37mm² every. This design signifies that solely probably the most essential areas must be finished with a cutting-edge 5nm course of, serving to to extend CPU effectivity and decrease prices and in the end shopper costs. Nevertheless, it additionally requires a quick interconnection between completely different chips working at 5.3 TB/s right here. The identical chip method has labored nice with Ryzen and has additionally made AMD a rising large, so it will likely be fascinating to see if it really works miracles within the GPU area as effectively.
Every of the patterns is spectacular in its personal proper. The reminiscence cache die makes use of a 64-bit reminiscence controller and second-generation Infinity Cache, which mix to supply 2.7 instances the height bandwidth of RDNA2 designs. In the meantime, the graphics computing die affords unified RDNA 3 compute models geared up for stream processing, AI acceleration, and RT. The design additionally splits the shader and front-end clock pace with 2.3 GHz for the previous and a couple of.5 GHz for the latter; AMD says this can lead to a extra environment friendly design – as much as 25 % energy financial savings when it comes to shaders and a 15 % larger front-end clock frequency.
RT has lengthy been an AMD bug, so second-generation options that help “1.5x extra beams in flight”, “new customized directions, and “new beambox sorting and traversal” are as much as 50 % extra per processing unit. – Whereas AMD would not appear to be dashing up some components of the RT pipeline the place Nvidia is, we would not see an enormous soar in RT efficiency versus rasterized efficiency as you may count on in any other case.
The show engine constructed into these playing cards is fairly loopy, supporting DisplayPort 2.1 and as much as 54Gbps video hyperlink bandwidth, offering 8K 165Hz (!) or 4K 480Hz (!!) with 12-bit coloration. Suffice to say we’re a bit off from such shows, however successfully refuting Nvidia’s 40-series playing cards restricted to DisplayPort 1.4. In the meantime, the twin media engine ought to bolster AMD’s poor status for streaming and media encoding, with help for AV1 encode/decode, simultaneous encode/decode for AVC/HEVC, and ‘AI Enhanced Video Encode’, which I am wanting ahead to listening to extra about.
| mannequin | CUs | recreation clock | VRAMs | meme bus | Board energy | Begin MSRP |
|---|---|---|---|---|---|---|
| RX 7900XTX | 96 | 2.3GHz | 24GB | 384 bits | 355W | 999 {dollars} |
| RX 7900XT | 84 | 2.0GHz | 20GB | 320 bits | 300W | $899 |
| RX 6950XT | 80 | 2.1GHz | 16 GB | 256 bit | 335W | 1299 {dollars} |
| RX 6900XT | 80 | 2.0GHz | 16 GB | 256 bit | 300W | 999 {dollars} |
| RX 6800XT | 72 | 2.0GHz | 16 GB | 256 bit | 300W | 649 {dollars} |
When it comes to the playing cards themselves, there appears to be a major hole between the 7900 XTX and the 7900 XT. The RAM numbers are the obvious distinction – 24 GB on the XTX and 20 GB on the XT, with a correspondingly smaller reminiscence bus (384 bit vs 320 bit). The rated ‘recreation clock’ has additionally dropped from 2.3 GHz to 2 GHz, with a discount from 96 to 84 compute models additionally important. Nevertheless, each playing cards are sipping energy in comparison with their RTX 4090 counterparts, with complete card energy rated at 355W for the XTX and 300W for the XT. Each playing cards help DisplayPort 2.1 and AV1 encode/decode.
When it comes to anticipated efficiency, AMD supplied framerate knowledge for the RX 7900 XTX, however solely in opposition to the RX 6950 XT. Right here they recorded 50 to 70 % efficiency positive aspects for the next-gen card, 1.5x in COD: MW2, Watch Canine Legion, Resident Evil Village (RT) and Metro Exodus (RT), 1.6x in Doom Everlasting (RT ) and 1.7x in Cyberpunk 2077. I used to be anticipating to see extra efficiency knowledge than that – like comparisons to Nvidia’s playing cards, possibly? – however as at all times, we’ll have to attend for the playing cards to succeed in reviewers to see how effectively these GPUs carry out in real-world testing.
Lastly, AMD has introduced FSR 3, which guarantees to double the body charge of FSR 2. In keeping with this assertion – and the presentation endnote referring to ‘Fluid Animated Frames’ – it looks like a reasonably secure guess that it is framing as DLSS 3. This know-how barely will increase enter lag, however since AI-generated frames are positioned between ‘actual’ frames, it is a fairly secure guess. Considerably improves fluency. This know-how could also be made obtainable for older AMD GPUs and even Nvidia/Intel fashions, as it seems that RDNA 3 {hardware} shouldn’t be used for this. This may give it a novel benefit over DLSS 3, which is at present unique to the costly RTX 4090 (and its upcoming 40-series counterparts). FSR 3 has a launch date of ‘2023’, so we’ll seemingly see much more details about it within the subsequent few months.
These had been AMD’s RDNA 3 bulletins! It will be fascinating to see how the brand new {hardware} stacks up as we method its December 13 launch date, as there’s room for important efficiency enhancements in an all-new structure – and the potential for some fascinating end-cases as effectively.
AMD is certainly making the suitable sounds to enchantment to these turned off by Nvidia – considerably larger body charges, future-proof show requirements, cheap energy targets and no 12-pin connectors – however efficiency and options should be in place as effectively.
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