first off Im new...to anyone whos e answered this before im sorry but i did check 25 pages of archives.Any ways i installed the 1900 plus xp into my a7m 266 mobo..I traded out my t bird that was clocked at 1.4.Any ways i have tried numerous benchmarks and have not noticed anything more than a marginal increase...I was wondering if my mobo is not fully compatible with the processor as it relates to cpu and mobo instructions.I have installed the 1007 bios update from the asus website.(im running win xp and use a 133 fsb)