I've been getting a C1 post error on my EVGA 680 board so I picked up the exact mobo here on the forums from Farlo.
Same error! It's gotta be the RAM. Mushkin RAM isn't exactly known for it's lifespan... I've already had to RMA it twice and now I've misplaced one stick after it was removed a year or so ago because it died on me.
If anyone has any PC2 6400 on the cheap, please let me know.