readygpu

AMD Radeon RX 7900 XT vs AMD Radeon RX 9070 XT

For running models locally, priced in Canada. At 8k context the first runs 23 models fully in memory, the second 14.

In short

The AMD Radeon RX 7900 XT has more memory for models: 20 GB against 16 GB. At 8k context the AMD Radeon RX 7900 XT runs 23 of the models we track fully in memory and the AMD Radeon RX 9070 XT 14; only the AMD Radeon RX 7900 XT holds Qwen 3.8 27B. On the models both run fully in memory, the AMD Radeon RX 7900 XT is about 1.3× as fast as the AMD Radeon RX 9070 XT (estimated, median across models). In Canada the AMD Radeon RX 7900 XT costs $2,175 at Amazon and the AMD Radeon RX 9070 XT $1,200 at Amazon: the AMD Radeon RX 9070 XT is $975 cheaper.

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

AMD Radeon RX 7900 XT

$2,175

Amazon

Add to build
AMD Radeon RX 9070 XT

$1,200

Amazon

Add to build

Specifications

SpecAMD Radeon RX 7900 XTAMD Radeon RX 9070 XT
GPURadeon RX 7900 XTRadeon RX 9070 XT
Memory20 GB GDDR616 GB GDDR6
Memory bus320-bit256-bit
Memory bandwidth800 GB/s640 GB/s
FP16 compute103 TFLOPS195 TFLOPS
SoftwareROCmROCm
Board power315 W304 W
PCIe generationGen 4Gen 5
PCIe lanesx16x16

What each runs

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

ModelAMD Radeon RX 7900 XTAMD Radeon RX 9070 XT
Qwen 3.8 27B26tok/sUD-Q4_K_Moffload
Qwen 3.6 27B25tok/sQ4_K_Moffload
Qwen 3.5 27B25tok/sQ4_K_Moffload
Gemma 4 26B-A4B88tok/sUD-Q4_K_Moffload
GLM 4.7 Flash76tok/sQ4_K_Moffload
Devstral Small 2 24B24tok/sQ5_K_Moffload
Qwen3 Coder 30B-A3B100tok/sQ4_K_Moffload
gpt-oss 20B100tok/sMXFP480tok/sMXFP4
Gemma 4 12B34tok/sQ8_027tok/sQ8_0
Qwen 3.5 9B45tok/sQ8_036tok/sQ8_0
Gemma 3 27B25tok/sQ4_K_Moffload
Mistral Small 3.2 24B24tok/sQ5_K_Moffload
Ministral 3 14B28tok/sQ8_028tok/sQ6_K
Qwen3 14B26tok/sQ8_026tok/sQ6_K
DeepSeek R1 0528 Qwen3 8B44tok/sQ8_036tok/sQ8_0
Qwen3 8B44tok/sQ8_036tok/sQ8_0
Phi-4 14B26tok/sQ8_026tok/sQ6_K
Qwen 3.5 4B92tok/sQ8_073tok/sQ8_0
Ministral 3 8B43tok/sQ8_035tok/sQ8_0
Granite 4.2 8B41tok/sQ8_033tok/sQ8_0
Gemma 4 E4B52tok/sQ8_042tok/sQ8_0
LFM2.5 8B-A1B180tok/sQ8_0144tok/sQ8_0
Llama 3.1 8B57tok/sQ6_K46tok/sQ6_K
Qwen 3.5 122B-A10Boffloadoffload
Gemma 4 31Boffloadoffload
Mistral Small 4 119Boffloadoffload
Qwen 3.6 35B-A3Boffloadoffload
GLM 4.5 Airoffloadwon't run
Qwen 3.5 35B-A3Boffloadoffload
Nemotron 3.5 Lightning 30B-A3Boffloadoffload
Kimi Linear 48B-A3Boffloadoffload
Qwen3 32Boffloadoffload
DeepSeek R1 Distill Qwen 32Boffloadoffload
Llama 3.3 70Boffloadwon't run
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
Qwen3 Coder Nextwon't runwon't run
gpt-oss 120Bwon't runwon't run
Qwen3 Next 80B-A3Bwon't runwon't run

Questions

Which is better for local AI, the AMD Radeon RX 7900 XT or the AMD Radeon RX 9070 XT?
Choose the AMD Radeon RX 7900 XT to run bigger models. Choose the AMD Radeon RX 7900 XT for speed. Choose the AMD Radeon RX 9070 XT to spend less.
Which can run bigger models, the AMD Radeon RX 7900 XT or the AMD Radeon RX 9070 XT?
At 8k context the AMD Radeon RX 7900 XT runs 23 of the models we track fully in memory and the AMD Radeon RX 9070 XT 14; only the AMD Radeon RX 7900 XT holds Qwen 3.8 27B.
Which is faster for local AI, the AMD Radeon RX 7900 XT or the AMD Radeon RX 9070 XT?
On the models both run fully in memory, the AMD Radeon RX 7900 XT is about 1.3× as fast as the AMD Radeon RX 9070 XT (estimated, median across models).
What is the price difference between the AMD Radeon RX 7900 XT and the AMD Radeon RX 9070 XT?
In Canada the AMD Radeon RX 7900 XT costs $2,175 at Amazon and the AMD Radeon RX 9070 XT $1,200 at Amazon: the AMD Radeon RX 9070 XT is $975 cheaper.

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