Hey Miha
Try running memtest 5 a few times and/or memtest 4. If both pass you make a good chance of having a stable
OC. Did you try upping the vcore some? It is not because your cpu can handle 200x11.5 that it will be able to pull off 235x9.5 at the same voltage. Cpu's tend to heat up some more upon upping the fsb as well so carefully watch your temps. My cpu can do 213x12 at 1.87v and it won't get unstable till 59°C. Though it will get unstable at 214x12 the second it hits 50°C.
And be careful on what you buy. A 420 Watt
PSU of no brandname might as well be as crappy as the one you had before. It costs much less but lot's of
OC'ers buy the moderate priced component, then hungering for more power end up buying the more expensive one.
As to the problems i have had, it seems i'm once again stable. The S3 and AGP aperture size of 64mb seem to have done it. I haven't crashed since i tried those settings. With the booster again in place. Though i used to be stable using 128mb aperture size together with the Merlin taipan mod bios before i tried playing with the booster. Now it won't seem to do that anymore at exactly the same specs as i had before, as still in sig. With the booster and 20 pin ATX cable extention for the booster plugged out. These strange things keep sneaking up on me with this board
