E4400 Overclocking Help

I tried overclocking this CPU about 1-2 years ago to no avail and I gave up. After upgrading my gfx card recently, I've decided to give it another go, but I'm running into the same problem. I've reread almost everything I could find about overclocking to see whether I'm missing something, but I can't seem to figure it out.

Stock speed for the E4400 is 10x200 and I tried using the traditional "increase by 5-10mhz" method. 10x210 @ stock voltage works fine and passes p95 for 30 mins, but the computer fails to POST at 10x220 @ anything up to 1.5v. I tried increasing the NB/FSB voltages to +0.3v and it still doesn't POST.

I figured it might be an FSB wall or something, so I've tried bumping up to 10x280 and 10x300 @ 1.5v to see if I can achieve close to what I've seen others achieve. It still doesn't POST. I tried setting the NB/FSB voltages to +0.3v again and no POST.

During all of this, I set my PCI-E frequency to 100 and tried underclocking/leaving "Auto" settings on my RAM since I can't run them unlinked. The only other voltage settings are "DDR-2" and "PCI-E OverVoltage Controls" which I feel don't have much to do with my problem.

I've been told that it's probably a RAM issue and that I need to loosen my timings, but the only RAM options that it gives me control over are voltage and multiplier. I can't manually set the ratio aside from adjusting the multiplier. There's also this "High Speed DRAM DLL Settings," but the only options are "Option 1" and "Option 2" which I've tried at 10x220 and 10x280 with +0.3v to both FSB/NB @ 1.5v. Nothing.

Any help with this problem would be greatly appreciated as it's irritating to see people OCing to over 3ghz while mine sits at a measly 2. Thanks in advance!

CPU Core2Duo E4400 (L2 Stepping)
Motherboard Gigabyte GA-965P-DS3 rev. 3.3
Bios Award Modular BIOS v6.00PG Build F14
Memory 2x 1GB G.Skill DDR2 PC2-6400
Power Supply Enhance ENP-5150GH 500W
CPU cooling Thermalright Ultra120 Extreme (2x Silverstone 120)
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  1. try to see if there is something called divider (like 5/7) or something.
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