PowerColor Radeon RX 7900 XTX Hellhound Spectral White review

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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.

RadeonRX 7900 XTXRX 7900 XT6950 XT
GPU Navi 31 XTX Navi 31 XT Navi 21 KXTX
Process Node 5nm+6nm 5nm+6nm 7nm
Die Size 308mm2 (single GCD)
533mm2 (with MCDs)
308mm2 (singleGCD)
533mm2 (with MCDs)
Transistors 58 Billion 58 Billion 26.8 Billion
Compute Units 96 84 80
Raytrace Units 96 84 80
Stream Processors 6144 (12288) 5376 (10752) 5120
TMUs/ROPs 192 192 128
Game Clock 2.3 GHz 2 GHz 2100 MHz
Boost Clock 2.5 GHz 2.5 GHz 2310 MHz
FP32 TFLOPs 61 TFLOPs 52 TFLOPs 23.65 TFLOPs
Memory Size 24 GB GDDR6 20 GB GDDR6 16 GB GDDR6
Infinity Cache 96 MB 80 MB 128 MB
Memory Bus 384-bit 320-bit 256-bit
Memory Clock 20 Gbps 20 Gbps 18 Gbps
Bandwidth 960 GB/s 800 GB/s 576 GB/s
Effective Bandwidth 3500 GB/s 2900 GB/s 1794 GB/s
TBP 355W 300W 335W
PCIe Interface PCIe 4.0 x16 PCIe 4.0 x16 PCIe 4.0 x16
Price $999 $899 $1099 US

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 

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