Can my e4600 go further?

Hi, im new to this forum and was wanting to ask a question.

I finally bought a new cpu cooler yesterday and then decided to overclock my cpu. I have got it to 250x12 giving me 3.00GHZ. But here is my question, can it go further? I tried to go to 260MHZx12 but it wouldnt post? Do i need to adjust voltages or timings?

Sorry for my n00bness.

Any help is appreciated!

CPU: Intel Core 2 Duo E4600 OCD ~ 3.00GHZ
MB: Fatality f-i90HD
RAM: 2x1GB Kingston DDR2-800
GPU: HIS Radeon HD5770 OCD ~ 900/1350MHZ
HDD: 1X500GB SATA Seagate Internal
1X1TB SATA External
PSU: Coolermaster 650W
Case: Coolermaster WaveMaster

Part of the problem, besides the fact that the BIOS has very limited overclocking related options, is that at a FSB of 250MHz the lowest FSB : DRAM ratio available besides 1:1 at 500MHz is 3:5 (200/667 NB strap) for an effective 833MHz DRAM frequency. At a FSB of 260MHz the DRAM frequency jumps to 866MHz, so either make sure the DRAM ratio is 1:1, or bump the DRAM voltage and / or loosen the DRAM timings (tCL, tRCD, tRP, and tRAS) to compensate for the 200/667 strap; depending on the quality of your RAM. After making any DRAM frequency, timing, or voltage related adjustments, make sure to run Memtest86+ before attempting to boot into the OS. Also at a FSB of 260MHz the overclock is equal to 720MHz (compared to 600MHz at a FSb of 250MHz), so chances are you'll need to up the Vcore at that bus speed.