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GPU comparison
Compared on the specs that decide a purchase: memory, bandwidth, power, and which workloads each card actually fits — gaming, creative, or local models when that is the job.
Specifications verified August 3, 2026.
AMD
Radeon RX 7900 XTX
24GB VRAM · 960 GB/s
NVIDIA
GeForce RTX 3090
24GB VRAM · 936 GB/s
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| Specification | Radeon RX 7900 XTX | GeForce RTX 3090 |
|---|---|---|
| Vendor | AMD | NVIDIA |
| Memory | 24GB | 24GB |
| Usable for a model | 24GB | 24GB |
| Bandwidth | 960 GB/s | 936 GB/s |
| Segment | consumer | consumer |
| Released | December 13, 2022 | September 24, 2020 |
| Launch MSRP | ~$999~£787 | ~$1,499~£1,180 |
| UK street price | Search Amazon UK(paid link) (opens in new tab) | Search Amazon UK(paid link) (opens in new tab) |
Local models
Computed from published VRAM and the memory each model needs at Q4, including runtime overhead.
| Model | Radeon RX 7900 XTX | GeForce RTX 3090 |
|---|---|---|
| Qwen 3 4B4B parameters | Fits | Fits |
| Llama 3.1 8B Instruct8B parameters | Fits | Fits |
| Qwen 3 14B14B parameters | Fits | Fits |
| Gemma 3 27B27B parameters | Fits | Fits |
| Qwen 3 30B-A3B30B parameters | Fits | Fits |
| Qwen 3 32B32B parameters | Fits | Fits |
| Llama 3.3 70B70B parameters | Does not fit | Does not fit |
| Muse Glimmer 30B30B parameters | Fits | Fits |
| Mixtral 8x22B141B parameters | Does not fit | Does not fit |
| Qwen 3 235B-A22B235B parameters | Does not fit | Does not fit |
| Qwen 3 Coder 480B-A35B480B parameters | Does not fit | Does not fit |
| DeepSeek V3.2671B parameters | Does not fit | Does not fit |
Common questions
Answered from the verified figures on this page rather than general guidance.
Radeon RX 7900 XTX launched lower at ~$999 against ~$1499 for GeForce RTX 3090. Launch MSRP is an anchor, not a live price.
Neither has a clear edge on paper — 960 GB/s against 936 GB/s is too close to call from specs alone. Compare dated game tests at your target resolution and verify VRAM (24GB usable on Radeon RX 7900 XTX, 24GB on GeForce RTX 3090).
Neither — both have 24GB usable and hold the same models at Q4. Decide on bandwidth and price instead.
Neither meaningfully — 960 GB/s against 936 GB/s is too close to notice. Token throughput will be similar once a model fits, so decide on memory capacity instead.
Neither. A 70B model needs about 42GB at Q4 including overhead, above both cards. The largest that fits is Qwen 3 32B on Radeon RX 7900 XTX and Qwen 3 32B on GeForce RTX 3090.
If one card holds a model the other cannot, that capacity difference usually outweighs a bandwidth advantage. A model that spills to system memory can be substantially slower, but the actual impact depends on the backend, transfer path, context, and workload.