Hi can someone please help me with two problems with this motherboard? thanks in advance

(1) Crucial Ballistix 2GB 8500 would run fine at the stock speed if the cpu (E6400) is run at stock speed, however when I push the cpu to 3.2Gb, I would get all sorts of problems in WINXP even at 8500 5-5-5-15 @ 2.2v, doesn't help if the voltage is increased to 2.3v, very strange! Corsair Dominator 2GB 8500 ver 4.1 wouldn't even post!! is this motherboard plagued with memory incompatibility problems?

(2) this is a more recent problem, my pc would freeze at WINXP (SP2) boot screen, I figured out that if I turned off Jmicron in BIOS things would return to normal, is this a software conflict or hardware issue?

I am using BIOS ver 2602. thanks again