# Sparkle Arc Pro B60: only 150 GB/s VRAM bandwidth (spec 456)

> Source: <https://forum.level1techs.com/t/sparkle-arc-pro-b60-only-150-gb-s-vram-bandwidth-spec-456/259325#post_1>
> Published: 2026-10-23 10:54:53+00:00

I’ve been testing dense LLMs on my B60 and they seem to run at half the speed of some other reports - Qwen3.8-27B Q4_K_M at 8.6 t/s, against 16 t/s on other B60s with the same llama.cpp build and flags.

Troubleshooting with claude led me to a potential issue with vram bandwidth.

Testing with clpeak –global-memory-bandwidth I got the result - 150 GB/s.

If another B60 owner can run the same test and let me know I would really appreciate it.