Radeon RX 7900 XTX vs Arc B390 GPU
Short answer: which is best?
Radeon RX 7900 XTX is 528.1 % stronger than Arc B390 GPU. Radeon RX 7900 XTX ranks #2 of 74 measured graphics cards at WhatFPS (18,924 GPU score over 2 verified runs). Arc B390 GPU ranks #51 of 74 measured graphics cards at WhatFPS (3,013 GPU score over 1 verified runs). The numbers are measured in 3 verified WhatFPS runs — not estimated, not self-reported.
Measured comparison
| Metric | Radeon RX 7900 XTX | Arc B390 GPU |
|---|---|---|
| GPU score (the card's own performance) | 18,924 | 3,013 |
| Best rig (GAMING — whole PC) | 13,434 | 4,693 |
| Earth II (Vulkan) | 79.8 FPS | 12.2 FPS |
| Mission to Earth II (DX12) | 101.6 FPS | 16.8 FPS |
| Earth II Landing (DX12 Ultimate) | 89.5 FPS | 14.3 FPS |
| Supernova (DX11) | 41.7 FPS | 27.5 FPS |
| Memory bandwidth | 122 GB/s | 21 GB/s |
| VRAM | 24 GB | — |
| Ray tracing | Yes | Yes |
Fragz' verdict
The Radeon RX 7900 XTX takes a commanding lead in this comparison, outperforming the Arc B390 GPU by a substantial 528.1% in overall GPU score, though both cards currently have thin sample sizes with 2 and 1 verified runs respectively. This massive difference is clearly reflected across all our GPU benchmarks, with the Radeon card delivering significantly higher FPS in Earth II (Vulkan), Mission to Earth II (DX12), and Earth II Landing (DX12 Ultimate). Delving into the raw hardware, the Radeon RX 7900 XTX boasts a much higher ALU index, considerably more memory bandwidth at 122 GB/s, and a significant 24 GB of VRAM compared to the Arc B390 GPU's 0 GB. For gamers, this means the Radeon RX 7900 XTX will provide a dramatically smoother and more powerful experience across modern titles. While the Arc B390 GPU does support ray tracing, mesh shaders, and VRS, its lower performance and unusual VRAM configuration suggest it would only be suitable for extremely light tasks or older games.
Generated November 7, 2026 from the 3 verified runs available then. The verdict is never silently rewritten — new numbers get a new verdict.
What the numbers mean
The GPU score is the graphics card's own performance — that is what we rank on. GAMING is the whole rig's score in the best PC we measured the card in, and depends on processor, memory and storage. We show both and never mix them.
All numbers come from our benchmark suite: four hand-built 3D scenes written directly against the graphics APIs in Rust, the same load on every PC. The methodology is open at https://whatfps.com/metodik
All measurements for Radeon RX 7900 XTX · All measurements for Arc B390 GPU