Ok.. use Real; Temp to monitor CPU core temps and post those here ( idle and load ).
Use orthos to test the stability of your OC.
Set Bus speed to 220 Mhz and this will bump up the memory speed to 880 Mhz - set mem speed voltage to 1.9V ( use this only if you have DDR2 800 Mhz ram modules )
increasing mem voltage will keep you memory stable when it's running in high frequency due to OCing - if you find you rams are running fine with stock voltage of 1.8V then there's no need to increase mem voltage.
post some cpu-z screenshot of CPU, Memory and SPD tab - I wanna see those.
looking at the temps of of you cpu I think you can push more ( around ~3-3.1 Ghz ) - just keep the cpu temp below 68C under load.
BTW, what app you are using for cpu load testing ?
@ reflexx20 - that's a nice plan you have and if you can take your cpu around 3 Ghz or more there should not be any bottleneck.
Btw, HD6850 can be powered even using a FSP Saga II 500W or Corsair CX 400 - cost is Rs. 2.2 and 2.4K respectively.
Corsair VX450W costs Rs. 3.5-3.8 or so - So by going with FSP Saga II 500/ Corsair CX400 you can save a some money and get a good CPU cooler like CM Hyper TX3 @ ~1.2k for your CPU - this will keep your CPu cool and you might be able to OC it more ( 3.6 - 3.8 Ghz ) easily.