To any and all! The AMD 80486 40MHz CPU runs at a true 66MHz clock speed (NOT DOUBLED) in motherboards that have socketed oscillators which will support this speed! We have run it for well over two weeks now, 24 Hours a day with no crashes! Just look at the screen captures of benchmarks that I have included! The following programs were used to generate the files: SI.TXT =====> NORTON UTILITIES v. 6.0 SYSINFO LANDMARK.TXT =====> LANDMARK CPU v. 2.0 PMIPS.TXT =====> POWER METER MIPS v. 11 There have been many people that have challenged that I have this CPU truly running at 66MHz, and and all are welcome to call or visit me at work! Please not that the price of the CPU is less than $380! An Intel DX/2 50 is $100 - $150 more! A DX/2 66 is $250 More! Vincent J. Bono At-Lan-Tec, Inc. 7901 Beechcraft Rd Gaithersburg, MD 20879 (301) 948-7070 (301) 948-0658 FAX