I just bought a Gigabyte DS3 v3.3 and a E4300. It can go above 350 with no problems, I only have tried 400 FSB though. I haven't played with the settings very much yet, so I don't know how high I can go.

First try setting your vcore to 1.5 (then you can try lowering it), fix the PCI-E to 100, and disable C1E and EIST. Also make sure your mem can do +800mhz.

However, I changed the northbridge heatsink with a HR-05 SLI, the southbridge with a Zalman heatsink.

Also the jmicron controller and the ICS (next to the battery) gets pretty hot too, so I have ramsinks on them. (And my case ventilation is good).

I don't think there is a FSB wall. I think is either the settings or the NB/SB/ICS are getting too hot.

Here are the pics of my bios settings, the things I changed on the MB and CPU-Z


I have 2 x 1 GB of Buffalo Firestix PC6400 @ 2.1v (seems like D9GMH), I haven't played very much with the timings yet.

HR-05 SLI on NB, Zalman on SB, ramsinks on ICS and Jmicron.

Might try higher later =)