Intel E2160 + Asus P5K Deluxe Question

[Fireball]

Hey guys!

I've dabbled with overclocking in the past, so I'm pretty comfortable poking around the BIOS, but I have never had the need to change voltages or memory speeds.

I have the following setup :

Intel Core2Duo E2160 @ 1.80Ghz
Asus P5K Deluxe Mobo
2 Gig Kingston ValueRAM
250 Gig HDD
Sparkle Nvidia 8500GT (512 MB DDR2)
450 Watt PSU
Stock cooling that came with the cpu

Now for the real question. I hear everyone talking about how easy it is to push the E2160 up to 3 Ghz and beyond without the need to adjust voltages or cooling. However, I can't seem to push mine beyond 2.48 Ghz. I'm no expert, but I think my setup should give me some decent headroom, so why won't my CPU go any further?

I usually just increase the FSB clockspeed without changing the multiplier (x9). Granted, I tend to be a bit too impatient to increase it in 10mhz increments, so I just crank it up from 200mhz to 250mhz. It gets as far as the POST, then resets.
What am I doing wrong? Do I need more cooling, to adjust voltages or what? I'm stumped.

Any help appreciated!

Thanks a bunch!

[Frozenfireside]

Ignore 2nd post. Mods please delete/lock this one.