What is the part number of your Mushkin RAM?
When you get up and running with another BIOS chip, I would manually set the RAM Frequency/Timing/Voltage to the Mushkin specs that are on the sticker of the RAM or from Mushkin's website and not use the Auto or X.M.P. profile settings..Using Auto or X.M.P. profile settings has been known to cause problems..I only see some 2400MHz Blackline stuff on the
Memory Compatibility List for your board, but that doesn't neccessarily mean that what you have now won't work..There have been a few BIOS updates to Improve Memory Compatibility and the Memory Compatibility List doesn't seem to reflect that as it should..If you
Contact EVGA Support, they may be able to tell you what RAM is added by the 'Improved Memory Compatibility' updates that may not be on the compatibility list.
Incompatible RAM will most certainly cause freezing in BIOS (and otherwise), I've been down that road before..If incompatible RAM causes a freeze during a BIOS update, you're done until it's fixed..Although an extremely good indication, just because RAM passes Memtest doesn't neccessarily mean it's guaranteed to work in real-world applications, another road I've been down before..Memtest doesn't just test memory modules, it also tests the memory subsystem too..
MemTest86 Technical Information..I'm leaning towards a RAM issue and suggest getting some known-compatible/tested RAM that's either on EVGA's or Mushkin's compatibility list or poke around the forum and see what others are successfully using..Just get a few cheap sticks for testing purposes at least.