GPU HEAD-TO-HEAD

AMD Radeon RX 7900 XT vs AMD Radeon RX 7800 XT

Which graphics card is better for running local language models? Here is how the AMD Radeon RX 7900 XT (20 GB) compares against the AMD Radeon RX 7800 XT (16 GB) in real memory headroom, supported model architectures, and generation speed.

AMD · RDNA 3 20 GB VRAM

AMD Radeon RX 7900 XT

Memory Bandwidth: 800 GB/s (GDDR6 320-bit)
Fits fully in VRAM: 36 popular models
Power Draw (TDP): 315W
Largest recommended (Q4): 20B–22B

View all AMD Radeon RX 7900 XT models →

AMD · RDNA 3 16 GB VRAM

AMD Radeon RX 7800 XT

Memory Bandwidth: 624 GB/s (GDDR6 256-bit)
Fits fully in VRAM: 33 popular models
Power Draw (TDP): 263W
Largest recommended (Q4): 20B–22B

View all AMD Radeon RX 7800 XT models →

The AI Local Check Verdict: Which GPU should you buy for AI?

The AMD Radeon RX 7900 XT is the clear winner for local AI. It provides both 4 GB more VRAM and higher memory bandwidth (800 GB/s vs 624 GB/s).

This allows it to run larger model architectures entirely in video memory while also delivering faster token generation speeds on models of all sizes.

Models that fit on AMD Radeon RX 7900 XT, but NOT on AMD Radeon RX 7800 XT

These models run entirely in GPU VRAM on the AMD Radeon RX 7900 XT, but require slow system RAM offload on the AMD Radeon RX 7800 XT:

Model	Size	Downloads	AMD Radeon RX 7900 XT	AMD Radeon RX 7800 XT
ggml-org/NVIDIA-Nemotron-3.5-Lightning-30B-A3B-GGUF	31.58B	217,411	Fits in VRAM	Offload (Slow)
bartowski/Llama-3.3-70B-Instruct-GGUF	70.55B	210,869	Fits in VRAM	Offload (Slow)
unsloth/Qwen3-Coder-Next-GGUF	79.67B	179,196	Fits in VRAM	Offload (Slow)

Other Popular GPU Comparisons