Hello All, I have also been trying to overclock a Cyrix PR200 which my motherboard (a P5V580-B with 580VPX chipset) will let me use 2 x 75mhz or 2½ x 66mhz. The problem comes when I try to run it at 2½ x 75mhz, The system reports it as a Cyrix PR233 and boots OK and works in DOS mode but Windows (95) won't load. It just freezes at the splash screen. I have tried re-installing W95 but same problem persists. By the way, I can't find a manual for my motherboard, which makes changing jumper setting a real pain Any suggestions ? -----Original Message----- From: David Olds [SMTP:[log in to unmask]] you cannot overclock Cyrix CPUS with any success...Also, they do not allow .5 settings...they are either 2x or 3x.... -----Original Message----- From: Sami Al-Mohssen <[log in to unmask]> Subject: [PCBUILD] Overclocking the Cyrix CPU >When i change the multiplier jumper to 2.5 (the bus speed is fixed at >75MHZ) to overclock the cpu to 187MHZ the computer runs at half the speed >it reports that it has cyrix PR 90. why is this happening? how can i >overclock it then? The PCBUILD web site always needs good submissions. If you would like to contribute to the website, send any hardware tech tips or hardware reviews to: [log in to unmask]