RTX 4080 vs Arc B390 GPU
Short answer: which is best?
RTX 4080 is 381.9 % stronger than Arc B390 GPU. RTX 4080 ranks #4 of 74 measured graphics cards at WhatFPS (14,521 GPU score over 5 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 6 verified WhatFPS runs — not estimated, not self-reported.
Measured comparison
| Metric | RTX 4080 | Arc B390 GPU |
|---|---|---|
| GPU score (the card's own performance) | 14,521 | 3,013 |
| Best rig (GAMING — whole PC) | 14,765 | 4,693 |
| Earth II (Vulkan) | 63.1 FPS | 12.2 FPS |
| Mission to Earth II (DX12) | 78.4 FPS | 16.8 FPS |
| Earth II Landing (DX12 Ultimate) | 67.1 FPS | 14.3 FPS |
| Supernova (DX11) | 105.7 FPS | 27.5 FPS |
| Memory bandwidth | 204 GB/s | 21 GB/s |
| VRAM | 16 GB | — |
| Ray tracing | Yes | Yes |
Fragz' verdict
The RTX 4080 is the undisputed champion in this matchup, leading the Arc B390 GPU by a massive 381.3% in overall GPU score, though we must note the Arc B390 GPU's score is based on a thin sample of just one verified run. This performance gap is evident across our benchmarks, with the RTX 4080 delivering significantly higher frame rates: 62.9 FPS in Earth II (Vulkan) compared to 12.2 FPS, 77.9 FPS in Mission to Earth II (DX12) versus 16.8 FPS, and 67.3 FPS in Earth II Landing (DX12 Ultimate) against 14.3 FPS. These superior results are backed by the RTX 4080's much higher raw compute, boasting an ALU index of 539839 compared to 220037, a memory bandwidth of 195 GB/s versus 21 GB/s, a peak clock of 2895 MHz, and a substantial 16 GB of VRAM, whereas the Arc B390 GPU reports 0 GB. For serious gamers seeking top-tier performance, especially at higher resolutions and settings, the RTX 4080 is the clear choice. The Arc B390 GPU's incredibly low performance and reported 0 GB VRAM make it unsuitable for modern gaming.
Generated November 7, 2026 from the 6 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 RTX 4080 · All measurements for Arc B390 GPU