Rather than make a thread I will address the problem here. The rig in question is WCG0 in my system specs.
After installing the Megahalems, booting into the BIOS on my EVGA P55 SLI (A51 BIOS) showed that there was only 2040MB RAM installed. Exiting and booting into Win 7 x64 shows that 4GB is installed but only 1.99gb is usable. Under resource monitor the remaining 2gb is listed as "hardware reserved". Apparently many believe this is due to some error in the remapping feature, im not so sure.
What I attempted to fix it and the results:
-Clear the CMOS via reset button on MB
Result: No help, same issue still persists
-Reflash the A51 BIOS using EVGAs Windows based Flash Utility
Result: No help.
-Reflash to Legacy BIOS (A39)
Result: No help.
-Reflash from A39 to A51 BIOS
Result: No help.
-Remove CPU and inspect for proper pin contacts on CPU and no broken or bent pins on motherboard
Result: Everything looked good marks on all contacts, no change in situation.
-Complete removal of all heatsink mounting hardware
Result: No help.
-Multiple reseatings of CPU and Heastsink including hardware
Result: No help.
-Complete removal of RAM and reseating of modules in all slots (at least 15 times)
Result: No help.
At this point I'm at that WTF moment and getting ready to request an RMA on the board. Out of desperation I reflash the BIOS again to A51, remove the entire MB from case, and put everything back together as if it were a new install. Machine posts with 4 GB RAM in BIOS, but Win 7 will not boot. Use the recovery option and do a system restore and Win7 boots fine, shows all RAM is avail.
Got my dual GPU F@H software setup again (system restore kindly removed it) and redid my OC in the BIOS- so far so good. I can't really determine what the heck happened to the board or what part actually fixed it. My apologies to whoever else has this problem. Im not so sure that I will not have to RMA this board later if the problem comes back up.
On the brighter side even with a not so great application of AS5 and slightly cooler ambient temps this is what the Mega is accomplishing (HT on):
http://img.techpowerup.org/100122/Mega.jpg
I will see about editing this later with some more detail in hopes it will help someone else, but right now Im tired of working and thinking about it.