The time has finally come and after a lot of theory and unboxing in the run-up, we can finally test what the new Radeon RX 7900XTX and RX 7900XT can really do and where there might even be further potential. I assume that AMD was also somewhat surprised by the good performance of the GeForce RTX 4090 and later also the RTX 4080. Just like many of my readers, who initially suspected power-hungry pixel monsters behind both new Ada cards. However, as we all know, everything turned out completely different and it can be assumed that AMD added something at the last minute to the two cards launched today. The suspense is growing and now we finally reveal the surprise.
Important preface
Today, it is primarily about the technical overview of both reference cards as a test object and not about repeating what is already known. Of course, there are many benchmarks as usual, the comprehensive teardown, a very elaborate board and cooler analysis with some reverse engineering, as well as the analysis of the power consumption and the load peaks including a suitable power supply recommendation. Since I know that many colleagues will also repeat all the technical details including theory, which have already been presented in various tidbits, I will spare myself that today and only briefly refer to the already known slides and the short presentation of the two cards with the most important details. Because you want to see real figures today and not PR fireworks
The AMD Radeon RX 7900 XTX
AMD’s Navi 31 GPU has 58 billion transistors and offers up to 61 TFLOPs of single-precision computing power. This GPU also has a chiplet interconnect with 5.3 TB/s. With the 5 nm node from TSMC, Navi 31 GPU has an increased transistor density to 165% compared to Navi 2X. The Radeon RX 7900 XTX offers 96 CUs with 2.3 GHz clock and requires a board power of 355 watts. In terms of memory, the XTX model features 24 GB of GDDR6 memory clocked at 20 Gbps. This SKU has a 384-bit memory bus.
With a length of 29 cm from the outer edge of the slot bezel to the opposite end of the cooler cover, the card is still relatively short (even compared to the GeForce RTX 4090 FE and RTX 4080 FE). The height of the inserted card of 11.5 cm from the upper edge of the PCIe slot to the upper edge of the cooler cover is also normal, even if it could have been lower. But even here, you still take away important centimeters from the GeForce cards in terms of installation options in the case. We don’t want to discuss the bending radii of the power supply connections, as the 12VHPWR clop has already been discussed enough.
On the top, we primarily see the two 8-pin sockets for the external power supply. The red rally stripe had to be and apart from that we still see a translucent light strip illuminated LEDs in the background. If you now turn the 1799-gram card (cleverly nudged into the 1.8 kilogram weight limit) backwards once, you’ll see a backplate made of light metal.
The thickness of the card is around 4.5 cm from the PCB, with another 0.5 cm to be added for the backplate. This gives the total width of 5 cm. Which would almost be the end of the round trip, when we take a quick look at the slot panel (bracket). Tidy variety in full width. With the two DisplayPort 2.1 ports (up to 8K 165Hz or 4K at 480 Hz), an HDMI 2.1 jack, and a true USB Type-C port (hello VR community!).
The Radeon RX 7900 XT
The second new card is called Radeon RX 7900 XT and it still has 84 CUs and 20 GBytes of GDDR6. Everything is connected to a 320-bit interface. This means that both cards have a maximum bandwidth of 960 GB/s and 800 GB/s, respectively. However, AMD also specifies an “effective” bandwidth of 3.5 TB/s for the RX 7900XTX and 2.9 TB/s for the RX 7900XT. This number is related to 96 MB and 80 MB of Infinity Cache located in the six MCD chips. We have to reckon with 315 watts of power consumption for the smaller card.
The card looks a bit smaller, more graceful and unagitated, even if the proportions are of course correct again. However, if the XTX looked rather chubby and like a radiant plus-size model in a direct comparison, as you now have the graceful, dark side of the red-front graphics in your eyes (and hands). With a length of 27.5 cm from the outer edge of the slot bezel to the opposite end of the cooler cover, the card is even significantly shorter than the XTX (also compared to the GeForce RTX 4090 FE and RTX 4080 FE).
On the top, we primarily see the two 8-pin sockets for the external power supply. The red rally stripe is not missing this time either and otherwise we still see translucent light strips on the front, but no longer on top. Well, the card is also a bit cheaper. The height of the inserted card falls exactly one centimeter lower than the XTX with the measured 10.5 cm from the upper edge of the PCIe slot to the upper edge of the cooler cover. But even here, the GeForce cards take away even more centimeters, which clearly improves the installation possibilities in the case. Again, we’d better not discuss the bending radii for the power supply connections, see above.
If you turn the 1508 gram (medium) heavy card backwards, you will see a similar backplate as on the XTX. The design language is also very similar to the XTX, but still not the same. The thickness of the card is the same 4.5 cm from the PCB as with the XTX, whereby 0.5 cm have to be added for the backplate. This gives the total width of 5 cm. With the two familiar DisplayPort 2.1 ports, an HDMI 2.1 jack, and a true USB Type-C port, we end the navel-gazing of the two new Radeon cards.
Overview of both cards – Technical data
The two new cards are quite different, and not only on the outside, but just as well on the inside.
RX 7900 XTX | RX 7900 XT | |
Compute units | 96 | 84 |
AI accelerators | 192 | 168 |
Ray tracing accelerators | 96 | 84 |
Memory | 24 GB GDDR6 | 20 GB GDDR6 |
Memory speed | 20 Gbps | 20 Gbps |
Memory bus size | 384-bit | 320-bit |
Game clock speed | 2.3 GHz | 2 GHz |
Output | DisplayPort 2.1 | DisplayPort 2.1 |
TBP | 355 W | 315 W |
MSRP | 1000 USD | 900 USD |
With that, the first page is done and we are slowly preparing for the test.
- 1 - Introduction, technical data and technology
- 2 - Test system with the igor'sLAB PC from MIFCOM
- 3 - Teardown: PCB and Components
- 4 - Teardown: Cooler and disassembly help
- 5 - Summary gaming performance WQHD (2560 x 1440)
- 6 - Summary gaming performance Ultra-HD (3840 x 2160)
- 7 - Single charts for WQHD (2560 x 1440)
- 8 - Single charts for Ultra-HD (3840 x 2160)
- 9 - Workstation graphics and rendering
- 10 - Power consumption in detail and load balancing
- 11 - Transients, limits and PSU recommendation
- 12 - Clock rates, temperatures and infrared
- 13 - Fan speed and Noise
- 14 - Summary and conclusion
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