Radeon RX 7900 XT and XTX
Radeon RX 7900 XT and XTX Specifications
There are several differences between RDNA 2 and RX 7900 XT. However, the RX 7900 XT has 20% more Compute Units (CUs) and doubles the number of FP32 (32-bit floating point) computing functionality per CU. AMD still employs 64 Streaming Processors (SPs) per CU; however, that amount is more like double in many respects. Each GPU holds a single GCD chiplet (Graphics Compute Die) and up to six MCD chiplets (Memory Cache Die). The XTX has a fully enabled GCD and six MCDs. In contrast, the XT has a partially enabled GCD with 84 CUs and five MCDs — the sixth MCD slot will remain occupied, either with a dummy piece of silicon or a non-functional MCD (non-functional because it is fused off, though it may or may not be defective). Transistor counts have increased significantly compared to the previous generation RX 6000-series, with 58 billion total transistors compared to only 26.8 billion on Navi 21. Theoretical computation has increased by up to 159% compared to the RX 6950 XT, with 61.4 teraflops on the XTX card and 51.6 teraflops on the XT variant.
Radeon RX 7900 XT and XTX
Radeon RX 7900 XT will have 20GB of GDDR6 VRAM and 10,752 shader cores, it probably will not be as fast as the RTX 4090, which closes in at 100 teraflops but might match the 4080. Instead, it looks like the RX 7900 XT may aim for 52 teraflops if it launches with the above core specs. The XTX is listed at 61 TFLOPS.
AMD turned off some shading units on the Radeon RX 7900 XT with 20GB to reach its target performance. This is different from the fully unlocked Radeon RX 7900 XTX, which uses the same GPU but has all 12288 shaders turned on. The AMD Radeon RX 7900 XT uses two slots, so it gets power from two 8-pin connectors. The maximum board power it can use is 300W. There is one HDMI 2.1 output and three DisplayPort 2.0 outputs. During the presentation, there was no mention of PCI-Express 5.0 x16 connects, so it's PCI-Express 4.0 for Radeon RX 7900 XT connects to the rest of the system. The card will cost $899
Radeon RX 7900 XTX will have 24GB of GDDR6 VRAM and the complete 12,288 shader cores, it will probably get close to the RTX 4090 thanks to its infinity cache as well. As mentioned AV1 en/decode is present. TBP is 355 Watt, and this card will cost $999