Hello everyone. I'm trying to OC my E8400 on a Gigabyte ep43-ud3L (as shown in signature) just to see what I can get out of it. I've been running it at 3.6GHz and stock voltage for some time (idles down to 2.4GHz) and it is perfectly stable. I started fiddling around and noticed that I could only get the FSB up to 419MHz. The problem is that it can do 10 runs of Intel Burn Test at 3.771GHz and STOCK VOLTAGE (1.25V) no problem. I have a 120mm Xigmatek tower cooler and core temps are under 56C under load at that setting. However, it won't even boot at 420MHz (=3.78GHz) even with 1.35V on the Vcore. I've seen people do 4.4GHz on E8400's using 1.38V so it seems odd that I'm hitting a hard limit here.
The lowest ram multiplier I can set on my board is 2x which equates to 840MHz on my 800MHz DDR2 dimms. I've had the memory over 900MHz before, running Prime 95 blend overnight just fine, so I feel like the RAM isn't the problem. So, I'm thinking that the mobo is not okay with running the FSB any higher than 419MHz at this point. Any ideas to help me get over the wall?