RX 6900 XT vs RX 7900 XTX

Best sourced output tok/s per model (single-stream generation) — engine and version, quantization, context and a source link on every row. Hover a value for the quant.

Sourced data on this pair is thin — most of the board is still partial. Submit your own run and help fill the matrix: one prompt, three steps, no downloads.

RX 6900 XT2 sourced runs · best 346.1 tok/s

RX 7900 XTX6 verified runs · best 550.2 tok/s

Specs and evidence

	RX 6900 XT	RX 7900 XTX
VRAM	16 GB	24 GB
Sourced runs on the board	2	6
Models measured	2	5
Best output tok/s	346.1 tok/s	550.2 tok/s
Highest measured peak VRAM	—	22.9 GB
Street price (latest snapshot)	—	—

Sourced rows only. Peak VRAM is recorded by the person who ran the benchmark, so it is a floor for what the card can hold, not a specification. Price snapshots.

Head-to-head

On the 2 models measured on both cards, RX 6900 XT leads on 0, RX 7900 XTX on 2. The widest gap is on Qwen3.5-0.8B: RX 6900 XT 346.1 tok/s vs RX 7900 XTX 550.2 tok/s (RX 7900 XTX 59% faster).

The measured matrix

Model	RX 6900 XT	RX 7900 XTX
Qwen3.5-0.8B	346.1 MQ4	550.2 MQ4
LFM2.5-350M	275.8 MQ4	398.4 MQ4
Qwen3.8-27B	—	154.2 MQ4
Qwen3.6-35B-A3B	—	150.0 MQ4R
Qwen3.6-35B-A3B-abliterated-v4	—	82.1 Q8_0

Head-to-head (models tested on both): RX 6900 XT 0 · RX 7900 XTX 2 · tied 0 · data as of Oct 30, 2026. Full rules: methodology.

Related reading: RTX 5090 vs 3090 · quantization · Value index · Full board