RTX 5080 vs Arc B390 GPU
Short answer: which is best?
RTX 5080 is 445 % stronger than Arc B390 GPU. RTX 5080 ranks #3 of 74 measured graphics cards at WhatFPS (16,422 GPU score over 4 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 5 verified WhatFPS runs — not estimated, not self-reported.
Measured comparison
| Metric | RTX 5080 | Arc B390 GPU |
|---|---|---|
| GPU score (the card's own performance) | 16,422 | 3,013 |
| Best rig (GAMING — whole PC) | 15,624 | 4,693 |
| Earth II (Vulkan) | 72.7 FPS | 12.2 FPS |
| Mission to Earth II (DX12) | 87.2 FPS | 16.8 FPS |
| Earth II Landing (DX12 Ultimate) | 75.9 FPS | 14.3 FPS |
| Supernova (DX11) | 128.9 FPS | 27.5 FPS |
| Memory bandwidth | 326 GB/s | 21 GB/s |
| VRAM | 16 GB | — |
| Ray tracing | Yes | Yes |
Fragz' verdict
The RTX 5080 is the clear winner in this GPU showdown, outpacing the Arc B390 GPU by a massive 447.4% in overall GPU score. This translates directly to gaming performance, with the RTX 5080 delivering significantly higher frame rates across all tested scenes, such as 72.9 FPS in Earth II Vulkan compared to the Arc B390 GPU's 12.2 FPS. The RTX 5080 also boasts a much higher raw compute with an ALU index of 729727, vastly superior memory bandwidth of 313 GB/s, and 16 GB of VRAM, while the Arc B390 GPU measured with 0 GB of VRAM and only 21 GB/s bandwidth. For gamers, this means the RTX 5080 offers a vastly smoother and more capable experience, especially in demanding modern titles. However, it's important to note that the Arc B390 GPU's performance is based on a very thin sample of only one verified run, which introduces significant uncertainty.
Generated October 30, 2026 from the 5 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 5080 · All measurements for Arc B390 GPU