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

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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 3233.44 151.45 173.45 512 3807.60 3950.71 151.47 173.67 1024 3806.77 3948.27 151.49 173.35 qwen35 4B Q8_0 ubatch ROCm pp512 Vulkan pp512 ROCm tg128 Vulkan tg128 32 1368.32 706.18 77.57 88.58 64 1841.68 1323.46 77.65 88.57

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