Actually, leaving it on 16 threads performs a bit better than setting it to 32 threads. 16 threads: https://0x0.st/XaDB.png https://0x0.st/XaDB.png 32 threads

Actually, leaving it on 16 threads performs a bit better than setting it to 32 threads. 16 threads: https://0x0.st/XaDB.png https://0x0.st/XaDB.png 32 threads: https://0x0.st/XaDM.png https://0x0.st/XaDM.png But still not as fast as it ran on your 7700(X) and NumPy is 2-3x faster than matmul.c on my PC. I also changed KC to some other values (500: https://0x0.st/XaD9.png https://0x0.st/XaD9.png, 2000: https://0x0.st/XaDp.png https://0x0.st/XaDp.png), but it didn't change much performance wise.