Hello, My ATI X850PRO AGP is running great at 520/540 with stock cooling and 16 pipes, ultra stable and fast !! I applied the same hack to another card, exactly the same model and P/N, similar motherboard (first one was a Intel D865PERL, this one D865GBF), same drivers (catalyst 6.3), Windows XP PRO SP2, the first CPU was P4 2.8Ghz, this one is a P4 3.2Ghz, same settings (128MB reserved in BIOS, 64ms latency, tried fastwrites on/off) The flash went OK showing 16 active pipes but the computer is now very unstable, hangs after some time when testing 3D apps, the temp. is ok. under 72C. Any help will be appreciated. Thanks Camilo.