readygpu

NVIDIA GeForce RTX 3090 Ti vs AMD Radeon RX 7900 XTX

For running models locally, priced in the UK. At 8k context the first runs 28 models fully in memory, the second 28.

In short

Both have 24 GB of memory for models; the NVIDIA GeForce RTX 3090 Ti has 1,008 GB/s of bandwidth and the AMD Radeon RX 7900 XTX 960 GB/s. At 8k context both run the same 28 models we track fully in memory. On the models both run fully in memory, the NVIDIA GeForce RTX 3090 Ti is about 1.2× as fast as the AMD Radeon RX 7900 XTX (estimated, median across models). In the UK the NVIDIA GeForce RTX 3090 Ti costs £2,199 at Amazon and the AMD Radeon RX 7900 XTX £999 at Amazon: the AMD Radeon RX 7900 XTX is £1,200 cheaper.

Updated . Speeds are estimates; how they are worked out.

NVIDIA GeForce RTX 3090 Ti

£2,199

Amazon

Add to build
AMD Radeon RX 7900 XTX

£999

Amazon

Add to build

Specifications

SpecNVIDIA GeForce RTX 3090 TiAMD Radeon RX 7900 XTX
GPUGeForce RTX 3090 TiRadeon RX 7900 XTX
Memory24 GB GDDR6X24 GB GDDR6
Memory bus384-bit384-bit
Memory bandwidth1,008 GB/s960 GB/s
FP16 compute80 TFLOPS123 TFLOPS
SoftwareCUDAROCm
Board power450 W355 W
PCIe generationGen 4Gen 4
PCIe lanesx16x16

What each runs

Estimated decode speed with the most precise quant that fits each one est.

ModelNVIDIA GeForce RTX 3090 TiAMD Radeon RX 7900 XTX
Qwen 3.8 27B28tok/sUD-Q6_K23tok/sUD-Q6_K
Qwen 3.6 27B27tok/sQ6_K23tok/sQ6_K
Gemma 4 31B27tok/sQ5_K_M23tok/sQ5_K_M
Qwen 3.6 35B-A3B181tok/sUD-Q4_K_M153tok/sUD-Q4_K_M
Qwen 3.5 27B27tok/sQ6_K23tok/sQ6_K
Gemma 4 26B-A4B95tok/sUD-Q6_K80tok/sUD-Q6_K
Qwen 3.5 35B-A3B181tok/sQ4_K_M153tok/sQ4_K_M
GLM 4.7 Flash94tok/sQ5_K_M79tok/sQ5_K_M
Devstral Small 2 24B30tok/sQ6_K26tok/sQ6_K
gpt-oss 20B142tok/sMXFP4120tok/sMXFP4
Qwen3 Coder 30B-A3B128tok/sQ5_K_M108tok/sQ5_K_M
Qwen3 32B29tok/sQ4_K_M24tok/sQ4_K_M
Gemma 4 12B48tok/sQ8_040tok/sQ8_0
Qwen 3.5 9B64tok/sQ8_054tok/sQ8_0
Mistral Small 3.2 24B30tok/sQ6_K26tok/sQ6_K
DeepSeek R1 Distill Qwen 32B28tok/sQ4_K_M24tok/sQ4_K_M
Gemma 3 27B27tok/sQ6_K23tok/sQ6_K
Ministral 3 14B40tok/sQ8_034tok/sQ8_0
Qwen3 14B37tok/sQ8_031tok/sQ8_0
DeepSeek R1 0528 Qwen3 8B63tok/sQ8_053tok/sQ8_0
Qwen3 8B63tok/sQ8_053tok/sQ8_0
Phi-4 14B36tok/sQ8_031tok/sQ8_0
Qwen 3.5 4B130tok/sQ8_0110tok/sQ8_0
Ministral 3 8B62tok/sQ8_052tok/sQ8_0
Granite 4.2 8B59tok/sQ8_049tok/sQ8_0
Gemma 4 E4B74tok/sQ8_062tok/sQ8_0
LFM2.5 8B-A1B256tok/sQ8_0216tok/sQ8_0
Llama 3.1 8B82tok/sQ6_K69tok/sQ6_K
Qwen 3.5 122B-A10Boffloadoffload
Qwen3 Coder Nextoffloadoffload
Mistral Small 4 119Boffloadoffload
GLM 4.5 Airoffloadoffload
Qwen3 Next 80B-A3Boffloadoffload
Nemotron 3.5 Lightning 30B-A3Boffloadoffload
Kimi Linear 48B-A3Boffloadoffload
Llama 3.3 70Boffloadoffload
DeepSeek V4 Flashwon't runwon't run
GLM 5.3 Flashwon't runwon't run
Qwen 3.8 Flash Nextwon't runwon't run
MiniMax M2.7won't runwon't run
Nemotron 3 Super 120B-A12Bwon't runwon't run
gpt-oss 120Bwon't runwon't run

Questions

Which is better for local AI, the NVIDIA GeForce RTX 3090 Ti or the AMD Radeon RX 7900 XTX?
Choose the NVIDIA GeForce RTX 3090 Ti for speed. Choose the AMD Radeon RX 7900 XTX to spend less.
Which can run bigger models, the NVIDIA GeForce RTX 3090 Ti or the AMD Radeon RX 7900 XTX?
At 8k context both run the same 28 models we track fully in memory.
Which is faster for local AI, the NVIDIA GeForce RTX 3090 Ti or the AMD Radeon RX 7900 XTX?
On the models both run fully in memory, the NVIDIA GeForce RTX 3090 Ti is about 1.2× as fast as the AMD Radeon RX 7900 XTX (estimated, median across models).
What is the price difference between the NVIDIA GeForce RTX 3090 Ti and the AMD Radeon RX 7900 XTX?
In the UK the NVIDIA GeForce RTX 3090 Ti costs £2,199 at Amazon and the AMD Radeon RX 7900 XTX £999 at Amazon: the AMD Radeon RX 7900 XTX is £1,200 cheaper.

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