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HyperX Genesis 4GB 2133MHz - KHX2133C9AD3X2K2/4GX - http://www.valueram.com/datasheets/KHX2133C9AD3X2K2_4GX.pdf
Kingston HyperX H2O 4GB 2133Mhz - KHX2133C9AD3W1K2/4GX - http://www.kingston.com/datasheets/KHX2133C9AD3W1K2_4GX.pdf
DDR3-2133 9-11-9-27-2N @ 1.65v | DDR3-1600/1333 9-9-9-27-2N @ 1.5 - KHX2133C9AD3X2K2/4GX
DDR3-2133 9-11-9-27-2N @ 1.65v | DDR3-1600/1333 9-9-9-27-2N @ 1.5 - KHX2133C9AD3W1K2/4GX (2 XMP Profiles)
First, mix-match two (2) sets and especially at that Rated frequency 9.9/10 won't happen and for the 0.1/10 at voltages that are CrAzY.
CPU: | Genesis | H20 | Genesis | H20 |
Procedure, unplug the PSU for 5 minutes, using the 'Jumper' menthod follow the directions in this video - http://www.youtube.com/watch?v=rdHH9KrceR0
Boot into the BIOS and press (F5) to Load Optimized Defaults, and set the other BIOS tweaks needed i.e. SATA -> AHCI (if you used AHCI before), etc.
IF the PC successfully posts and boots into Windows now then look at the Resource Manager for any excessive 'Hardware Reserved' i.e. >2048MB. See -> http://i1013.photobucket.com/albums/af254/Jaquith/RM_7PRO6GB.gif
Let me know if that fixes the missing RAM, if it does then I'd manually set the RAM at DDR3-1600 9-9-9-27-2N @ 1.5v~1.55v and a VCCIO of 1.15v~1.20v.