Have you tried running your memory and CPU unlinked? I don't know if I told you to try that or not.
I know that my E8400 does 4.4GHZ @ 1.385V. You are probably giving it too much voltage. Also update to the latest BIOS and set all the voltages except for CPU to 'Auto'.
BIOS Update:
SZ1I BIOS is available now, the major highlights are listed below:
    * Improves support for CPU's with unlocked multipliers.
CPU Fast Read is a new option that is introduced with the SZ1H/SZ1E BIOS. A setting of 'Enabled' gives the fastest memory/CPU performance. A setting of 'Disabled' is highest compatibility mode for those that experience the video corruption bug.
BIOS updating can be accomplished VIA the below methods:
FLOPPY Installation - Recommended installation method
    * Download the following executable: 
ftp://ftp.evga.com/bios/E175_SZ1I.exe
    * Insert blank floppy disk into drive and run executable
    * Restart machine, and set floppy as the primary boot device
    * Press "Y" to program BIOS
    * After flash, power off PC completely, on reboot load defaults in BIOS
CD/DVD Installation - Recommended installation method
    * Download the following .iso file: 
ftp://ftp.evga.com/bios/E175_SZ1I.iso
    * Use a CD Burning software to burn the .iso image onto a blank CD (Nero, Alochol 120%, MagicISO etc.)
    * Restart machine, and set the CD Drive as the primary boot device.
    * The BIOS flash process will begin, Press “Y” to program BIOS.
    * After flash remove the CD, power off PC Completely.
    * Turn on the PC and load defaults in BIOS.