AMD Radeon 780M vs AMD RX 7900 XTX for local LLMs
5 reports on the AMD Radeon 780M and 28 on the AMD RX 7900 XTX
Which is faster for local LLMs?
On Gemma 4 26B · 4B active at 4-bit, the AMD Radeon 780M runs at 25.0 tokens per second (one run) and the AMD RX 7900 XTX at 142.8 (one run). Those are community reports whose engines and settings differ, so the gap is a rough sign, not a controlled measure of the two cards. Memory bandwidth, which caps how fast a card can write, is 8.0x higher on the AMD RX 7900 XTX (120 GB/s on the AMD Radeon 780M, 960 on the AMD RX 7900 XTX).
- Memory
- shared memory unified
- Memory bandwidth
- not on record
- FP16 compute
- not on record
- Reports
- 5
- Memory
- 24GB
- Memory bandwidth
- 960 GB/s
- FP16 compute
- 123 TFLOPS
- Reports
- 28
Measured on both
Median tokens per second from plain runs (one device, one request, no speculative decoding, the whole model in the device's memory) of the same model size at the same quant level. Engines and context lengths can still differ between the runs. How to read these
| Model | AMD Radeon 780M | AMD RX 7900 XTX |
|---|---|---|
| Gemma 4 26B · 4B active4-bit | 25.0one run | 142.8one run |
Estimated by the calculator
The quant the calculator recommends for each card and its estimated speed at a 32,768-token context with 32 GB of system RAM, from memory bandwidth and the model's shape. Where a model was also measured above, the measurement wins.
| Model | AMD Radeon 780M | AMD RX 7900 XTX |
|---|---|---|
| Gemma 4 26B · 4B active | not in the calculator yet | 78.4 t/sQ5_K_S |
| Qwen3.8 27B | not in the calculator yet | 34.8 t/sQ4_K_M |
| Qwen3.8 125B · 6B active | not in the calculator yet | 19.5 t/sQ2_K, experts in RAM |
| DeepSeek V4 Flash 284B · 13B active | not in the calculator yet | doesn't fit at these settings |
| Qwen3.6 35B · 3B active | not in the calculator yet | 123.2 t/sQ4_K_S |
| Qwen3.6 27B | not in the calculator yet | 34.8 t/sQ4_K_M |
| DeepSeek V4.1 Flash 552B · 16B active | not in the calculator yet | doesn't fit at these settings |
Change the context, RAM or model in the calculator: AMD Radeon 780M · AMD RX 7900 XTX
Every report on each card, with its source: AMD Radeon 780M · AMD RX 7900 XTX