Radeon RX 7800 XT reference review

Introduction

Radeon RX 7800 XT review
With 16GB and a proper amount of raw shader performance

AMD has introduced the Radeon RX 7700 XT and 7800 XT, expanding its product lineup within the mainstream to the high-end graphics segment. The launch of these GPUs signifies a substantial addition to AMD's offerings. Despite the delay in their release, the cards boast impressive shader horsepower, complemented by 12GB and 16GB GDDR6 graphics memory. These attributes position the cards to have a significant impact, particularly within the WQHD monitor resolution domain. Hoever even the WQHD comes at a price these days as the 7700 XT starts at 449, and the 7800 XT model starts at 499 USD. This review is based on the latter product in a reference model. For a while now, rumours have been flooding the graphics card arena, and as so often, most of them become an actuality. Meet the new Navi 32-based GPU models. The Radeon 7800 XT with its 16GB 256-bit memory configuration at 19.5 Gbps, is bound to impress. This particular iteration is poised to utilize the complete 60 CU / 3840 Shader processors setup of the GPU and boasts a Total Board Power (TBP) of 263W. The AMD Radeon RX 7800 XT GPU is built upon the Navi 32 SKU framework and thus chiplets, incorporating four Memory Controller Domains (MCDs). The GPU core boasts 3840 cores, meticulously distributed across 60 Compute Units to enhance performance. Additionally, the GPU incorporates a substantial 64 MB Infinity Cache, functioning at an 18 Gbps pin speed, thereby yielding a commendable total bandwidth of 576 GB/s. The second Navi 32 variant, aka Radeon RX 7700 XT, sees a friendly 54 CU/3456 shader processor configuration, complemented by 12GB memory on a 192-bit bus running at an effective 18 Gbps data rate. This points towards a Navi 32 iteration with one of the four MCDs disabled, resulting in 48 MB of Infinity Cache. The core setup of the RX 7700 XT is anticipated to encompass approximately 54 Compute Units, housing a total of 3456 stream processors.


Img_2144

AMD Radeon RX 7000 Specifications
Radeon RX  7900XTX 7900 XT 7800 XT 7700 XT 7600
Architecture RDNA3 (TSMC N5) RDNA3 (TSMC N5) RDNA3 (TSMC N6) RDNA3 (TSMC N6) RDNA3 (TSMC N6)
GPU Navi 31 XTX Navi 31 XT Navi 32 XL Navi 32 XT Navi 33
GPU Clusters 96 CUs 84 CUs 60 CUs 54 CUs 32 CUs
FP32 Cores 6144 5376 3840 3456 2048
Game Clock 2.3 GHz 2.0 GHz 2.124 GHz 2.171 GHz 2.25 GHz
Boost Clock 2.5 GHz 2.4 GHz 2.43 GHz 2.54 2.625 GHz
Memory 24GB G6 20GB G6 16GB G6 12 GB G6 8GB G6
Memory Bus 384-bit 320-bit 256-bit 192-bit 128-bit
Memory Speed 20 Gbps 20 Gbps 19.5 Gbps 18 Gbps 18 Gbps
L3 Cache 96 MB 80 MB 64 MB Gen2 48MB Gen2 32 MB Gen2
Board Power 355W 315W 263W 245W 165W
Power Connectors 2 × 8-pin 2 × 8-pin 2 × 8-pin 2 × 8-pin 1 x 8-pin
PCIe Interface Gen4 x16 Gen4 x16 Gen4 x16 Gen4 x16 Gen4 x8
MSRP $999 $899 $499 $449 $269
Launch Date December 2022 December 2022 September 2023  September 2023 May 2023

AMD's recent product aims to achieve optimal performance levels. One method employed is the enhancement of voltages and clock speeds, a straightforward approach to improving speed. Nevertheless, this decision has repercussions. A noticeable outcome is the GPU's elevated power consumption, which stands at 263W, marking a ~30% uptick when juxtaposed with the RTX 4070 from Nvidia. Given these figures, it's reasonable to speculate that third-party cards might adjust their TGP (total graphics power) to approach 300W, especially in models with overclocking capabilities. This could suggest a trend toward heftier designs.


Printed from: https://www.guru3d.com/review/radeon-rx-7800-xt-reference-review/