AMD RX 6600 XT vs AMD Strix Halo 128GB for local LLMs
2 reports on the AMD RX 6600 XT and 82 on the AMD Strix Halo 128GB
Which is faster for local LLMs?
Nobody has reported the same model at the same quant on both cards yet, so there's no measured head-to-head. Memory bandwidth, which caps how fast a card can write, is about the same on both (256 GB/s on the AMD RX 6600 XT, 256 on the AMD Strix Halo 128GB). The estimates below compare them on the models people run most.
AMD RX 6600 XT
- Memory
- 8GB
- Memory bandwidth
- 256 GB/s
- FP16 compute
- 21.2 TFLOPS
- Reports
- 2
AMD Strix Halo 128GB
- Memory
- 128GB unified
- Memory bandwidth
- 256 GB/s
- FP16 compute
- 59 TFLOPS
- Reports
- 82
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.
| Model | AMD RX 6600 XT | AMD Strix Halo 128GB |
|---|---|---|
| Qwen3.8 27B | 1.6 t/sQ6_K, layers on CPU | 3.5 t/sFP16 |
| Qwen3.8 125B · 6B active | doesn't fit at these settings | 12.6 t/sQ6_K |
| DeepSeek V4 Flash 284B · 13B active | doesn't fit at these settings | 33.5 t/sQ2_K |
| Qwen3.6 35B · 3B active | 14.3 t/sQ5_K_M, experts in RAM | 12.6 t/sFP16 |
| Qwen3.6 27B | 1.6 t/sQ6_K, layers on CPU | 3.5 t/sFP16 |
| Gemma 4 26B · 4B active | 9.1 t/sQ6_K, experts in RAM | 9.5 t/sFP16 |
Change the context, RAM or model in the calculator: AMD RX 6600 XT · AMD Strix Halo 128GB
Every report on each card, with its source: AMD RX 6600 XT · AMD Strix Halo 128GB