Originally Posted by FtW 420;12133945
Memory usually has several JEDEC specs, but same as the video card, if you buy 1600Mhz 8-8-8 24 2t @ 1.65V memory & you run it at that speed & timings, you're running at it's max rated stock speed.
If the 1600Mhz memory specs are from 1.5 to 1.65 volts it isn't necessarily being run out of spec as soon as you step it up to 1.52V at 1066 9-9-9 27 27 2t.
Those jedec specs are there that way you can adjust the RAm to suite the CPU. its not there as different "OC" settings.
Take a word from intel
Originally Posted by Intel.com
Intel® Extreme Memory Profile (Intel® XMP) is a performance-packed expansion of the standard DDR3 memory specification, enabling a robust, overclocking solution designed to take advantage of the mega-gaming features built into Intel® technology-based PCs. If you like to overclock and squeeze every possible ounce of performance from your PC, then memory based on Intel® XMP is the solution you need to destroy your enemies and save the universe without breaking a sweat.
Even intel said it. Its a over clock setting.
if you look up the IC on the chips you will see they arent rated for the timings in the XMP.