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AMD Radeon RX 6900 XT - ROCm vs Vulkan - Gemma 4 and Qwen 3.5 speed benchmarks

Via r/LocalLlama
Tuesday, Apr 28, 2026 · 9:53AM
Summary

Did some quick tests after building llama.cpp with ROCm 6.4.2 and latest Vulkan for my 6900 XT gemma4 E2B Q4_K ubatch ROCm pp512 Vulkan pp512 ROCm tg128 Vulkan tg128 32 1536.60 1423.49 151.92 174.59 64 1590.65 1930.60 151.41 173.76 128 2651.11 2998.42 151.53 173.71 256 3653.19 3233.44 151.45 173.45

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