Only seeing 4GB out of 8GB may be a voltage problem, try raising the CPU/NB voltage to 1.2 and DRAM to 1.6 just to test and let us know if it clears it up...Could also be a problem with the MC or Mobo, might check for bent/broken pins
I'll try that man, but i'm hoping its not the pins because i am NOT doing that. It was difficult getting that CPU in and it's not coming back out
wish me luck
Did you solve your problem? If so, how? I have a similar problem, only showing 8 of 16 GB memory, have been researching a fix for most of a week! Unlike you though, after trying a couple more changes in the BIOS, my next step is reseating the CPU ... as much as I hate to go there again. But I've read enough posts to know that it could solve the problem.