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I used it as a Certified Memory module on a first time when acquiring DDR Motherboard from EPoX. It was an EP-8KHA+ motherboard, and I shoehorned the PNY D256M6421OPT module, and got SPEEDY memory access and loading, it runs twice as fast as PC133 SDRAM, and I would use it for ANY DDR266 motherboards I build for my clients! As always, I'd recommend CERTIFIED (No KNOCK-OFFS) Motherboards AND Memory Modules for SEAMLESS operations regardless of the OS you use, such as Windows (98,NT,2000,XP), and Linux in all flavors. This is a must!