Over-clocking Intel Pentium Dual-Core E2180 @2.0Ghz?

ok heres the break-down: if been trying to get this thing to 2.6 GHz but i can only get it to 2.2 GHz all i did was to change the CMOS ratio from 200 to 220; anything above that and it won't boot into windows and maybe some post problems. My board is a ASRock G41M-VS2( so i get that it isn't a very good rig). However by chance there are possibilities to bump the clock, here are cpu-z's readings:

core voltage: 1.266-1.288 (varies seems i need to disable power saving options)

Core speed: 2199.2 MHz ( i have the CMOS ratio at 220 stable)

Multiplier: x 10.0

Bus Speed: 219.9 Mhz

rated FSB: 879.6 MHz

i don't see options to change these in bios only somthing abt DRAM timings

FSB:DRAM= 3:5

Cas# latency: 5.0 clks

RAS# to CAS#: 5 clks

RAS# precharge#: 5clks

cycle time# 15 clks

yeah i have 3Gs of DDRII-800 installed at DDRII-763 or sumthing like that

GPU: ASUS Radeon HD4870