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AMD Radeon RX 7800 XT vs AMD Radeon RX 7900 XT

For running models locally, priced in India. At 64k context the first runs 10 models fully in memory, the second 13.

In short

The AMD Radeon RX 7900 XT has more memory for models: 20 GB against 16 GB. At 64k context the AMD Radeon RX 7900 XT runs 13 of the models we track fully in memory and the AMD Radeon RX 7800 XT 10; only the AMD Radeon RX 7900 XT holds Gemma 4 26B-A4B. 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 7800 XT (estimated, median across models).

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

AMD Radeon RX 7800 XT

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AMD Radeon RX 7900 XT

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Specifications

SpecAMD Radeon RX 7800 XTAMD Radeon RX 7900 XT
GPURadeon RX 7800 XTRadeon RX 7900 XT
Memory16 GB GDDR620 GB GDDR6
Memory bus256-bit320-bit
Memory bandwidth624 GB/s800 GB/s
FP16 compute74 TFLOPS103 TFLOPS
SoftwareROCmROCm
Board power263 W315 W
PCIe generationGen 4Gen 4
PCIe lanesx16x16

What each runs

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

ModelAMD Radeon RX 7800 XTAMD Radeon RX 7900 XT
Gemma 4 26B-A4Boffload63tok/sUD-Q4_K_M
gpt-oss 20B51tok/sMXFP465tok/sMXFP4
Gemma 4 12B24tok/sQ8_031tok/sQ8_0
Qwen 3.5 9B29tok/sQ8_038tok/sQ8_0
Ministral 3 14Boffload23tok/sQ4_K_M
DeepSeek R1 0528 Qwen3 8B23tok/sQ4_K_M24tok/sQ8_0
Qwen3 8B23tok/sQ4_K_M24tok/sQ8_0
Qwen 3.5 4B51tok/sQ8_066tok/sQ8_0
Ministral 3 8B24tok/sQ4_K_M24tok/sQ8_0
Granite 4.2 8Boffload24tok/sQ6_K
Gemma 4 E4B34tok/sQ8_044tok/sQ8_0
LFM2.5 8B-A1B48tok/sQ8_062tok/sQ8_0
Llama 3.1 8B24tok/sQ5_K_M29tok/sQ6_K
Qwen 3.8 27Boffloadoffload
Qwen 3.5 122B-A10Bwon't runoffload
Qwen 3.6 27Boffloadoffload
Gemma 4 31Boffloadoffload
Mistral Small 4 119Boffloadoffload
Qwen 3.6 35B-A3Boffloadoffload
Qwen 3.5 27Boffloadoffload
Qwen 3.5 35B-A3Boffloadoffload
GLM 4.7 Flashoffloadoffload
Devstral Small 2 24Boffloadoffload
Nemotron 3.5 Lightning 30B-A3Boffloadoffload
Kimi Linear 48B-A3Boffloadoffload
Qwen3 Coder 30B-A3Boffloadoffload
Qwen3 32Boffloadoffload
Gemma 3 27Boffloadoffload
Mistral Small 3.2 24Boffloadoffload
DeepSeek R1 Distill Qwen 32Boffloadoffload
Qwen3 14Boffloadoffload
Phi-4 14Boffloadoffload
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
GLM 4.5 Airwon't runwon't run
Qwen3 Next 80B-A3Bwon't runwon't run
Llama 3.3 70Bwon't runwon't run

Questions

Which is better for local AI, the AMD Radeon RX 7800 XT or the AMD Radeon RX 7900 XT?
Choose the AMD Radeon RX 7900 XT to run bigger models. Choose the AMD Radeon RX 7900 XT for speed.
Which can run bigger models, the AMD Radeon RX 7800 XT or the AMD Radeon RX 7900 XT?
At 64k context the AMD Radeon RX 7900 XT runs 13 of the models we track fully in memory and the AMD Radeon RX 7800 XT 10; only the AMD Radeon RX 7900 XT holds Gemma 4 26B-A4B.
Which is faster for local AI, the AMD Radeon RX 7800 XT or the AMD Radeon RX 7900 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 7800 XT (estimated, median across models).

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