AMD has announced its new generation of video cards based on the RDNA 3 architecture. The Radeon RX 7900 XT and Radeon RX 7900 XTX are new top models that are the first gaming GPUs to use chiplets. Cards will be released on December 13th.
With the Radeon RX 7000 series video cards, AMD is introducing the RDNA 3 architecture with significant improvements over the previous generation. The manufacturer says that during development it emphasized good performance per watt without sacrificing better gaming performance. According to AMD, performance per watt is up to 54 percent higher in RDNA 3 than in RDNA 2.
Chiplets on the GPU
By far the biggest change we’re seeing with the new Radeon cards is the transition from one monolithic chip to multiple chips. Just as AMD has been doing with Ryzen processors for several generations, the manufacturer uses multiple chips and combines them into one collaborative group. The Radeon RX 7900 XT and XTX are based on the Navi 31 chip. Up to a maximum of 7 chipsets are combined in this, of which the Graphics Compute Die is the largest and contains all the stream processors. This single GCD is flanked by smaller chips called Memory Cache Dies, which contain the Infinity Cache, as well as a 64-bit GDDR6 memory controller.
As in the case of the RX 6000 series RDNA 2 video cards, AMD again uses the Infinity Cache as a memory buffer between the graphics chip and the GDDR6 video memory, but this connection is second-generation and therefore much faster. AMD states that its maximum bandwidth at 5.3 TB/sec down the line is 170 percent higher than the memory arrangement on the previous generation. The Infinity Cache has been reduced from 128MB on the Navi 21 to 96MB on the new Navi 31 chip, which, thanks to a smarter use of memory, does not lead to a performance loss, but makes a difference in power consumption.
New computational unit, faster ray tracing and artificial intelligence
The computing unit in RDNA 3 is equipped with Dual version SIMD module, in which AMD is making roughly the same modification that Nvidia has done with its Ampere architecture. Any stream processor can now operate on a floating point, integer, or ai task simultaneously. It is still unclear how flexible the new computing unit will be in organizing and distributing this work, but the theoretical computing power at least doubles with this step. With this modification, AMD does not specify the number of compute cores twice as high, and Nvidia has also started to work with its own CUDA cores. With two AI accelerators placed for each computational unit and the addition of new instructions, performance in this area should be 2.7 times higher than RDNA 2.
Offline clock speeds
In order to get performance per watt as high as possible, AMD has separated the clock and front-end shading speeds into the Navi 31 design. According to the manufacturer, high front-end clock speeds are important to performance, but the shading themselves can run a bit slower without reducing the performance. In the RX 7900 XTX, it was decided to run shaders at a maximum of 2300 MHz, while the front end of this chip worked at 2500 MHz. The manufacturer states that it chooses the best balance because clock speeds are 15 percent higher than the previous generation, while at the same time saving up to 25 percent in power consumption.
radiance display engine
With the RX 7000 series, the display’s output is also getting a major update, which AMD has renamed the Radiance Display Engine. The new generation of Radeons features the all-new DisplayPort 2.1 standard and can output 12 bits per channel. With DP 2.1, the massive 54Gbps bandwidth allows for an 8K screen at up to 165Hz without compression, or a 4K display at up to 480Hz. This is a huge step forward from DisplayPort 1.4, as used in the RX 6000 series as well as in Nvidia’s new RTX 40 series cards. With DP 1.4 the maximum is 8K at 60Hz and 4K at 240Hz without compression. During the presentation, the manufacturer liked to emphasize this advantage in connectivity compared to its competitor.
Media Engine, FSR 3 and Hypr-RX
With the RX 7000 series, AMD is introducing AV1 encoding support for its graphics cards for the first time. The new media engine should also enable better video encoding through the use of AI, although the manufacturer has yet to provide details on exactly how to do this and whether AI accelerators are used for this. However, SmartAccess Video was introduced, in which the Ryzen 7000 processor and Radeon RX 7000 video card together can perform a heavy encoding or decoding task at an accelerated rate.
During the presentation, AMD briefly mentioned that a new version of FSR is coming, with a launch expected sometime in 2023. Under the name FSR 3, AMD will release an analogue of DLSS 3 for RDNA 3 graphics cards, in which AI accelerators will be used and the GPU will be used. Creates frames and the width between displayed frames.
In software, AMD also plans to introduce Hypr-RX in the first half of 2023. This functionality should make it easier for gamers to choose the optimal game profile in Adrenalin, without having to manually select features like Boost, FSR, and SuperResolution.
At the presentation, AMD made a number of performance claims for the RX 7900 XTX, but the manufacturer didn’t make a direct comparison with Nvidia’s GeForce RTX 4090. Overall, ray tracing performance is up to 50 percent better than the RX 6950 XT, and in the drizzle, This will be between 4K. It should be 50 and 70 percent. If AMD can achieve this, it will be a question of whether the RTX 4090 or the RX 7900 XTX is faster. It is also remarkable that AMD indicates in its presentation that the FSR on RDNA 3 provides a greater increase in performance than the proportional case of the RX 6950 XT.
Prices and availability
The AMD Radeon RX 7900 XT and RX 7900 XTX will be available from December 13, according to the manufacturer, in both the reference versions and the custom cards that board partners will bring. The RX 7900 XT has a suggested retail price of $899, and the RX 7900 XTX has a suggested retail price of $999. Converted to euros, with the current exchange rate including VAT, which is currently €1,110 for the RX 7900 XT and €1,233 for the RX 7900 XTX.
|RX 7900 XTX||RX 7900 XT||RX 6950 XT|
|general engineering||RDNA3||RDNA3||RNA 2|
|GPU||Navi 31||Navi 31||Navi 21|
|die size||300 mm² GCD
6 x 37 mm² MCD
|300 mm² GCD
5x 37 mm² MCD
|transistors||58 billion||Unknown||26.8 billion|
|The production process||5 nm + 6 nm TSMC||5 nm + 6 nm TSMC||TSMC 7 nm|
|Performance (FP32)||61.6 flops||Unknown||23.65 flops|
|memory||24 GB GDDR6||20 GB GDDR6||16 GB GDDR6|
|Memory bus||384 bit||320 bit||256 bit|
|PCI Express generation||PCIe 4.0 . slot||PCIe 4.0 . slot||PCIe 4.0 . slot|
|Infiniti cash||96 MB||80 megabytes||128 MB|
|TBB||355 W||300 watts||335 W|
|release day||December 13, 2022||December 13, 2022||May 10 2022|
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