2 options id say for you.
have you ever tried the heatgun method?
basically heat up all the chips with a heat gun (not hair dryer) for about 10-15 secs each then hit the cpu and gpu for 30 seconds
let it cool down then flip it over and hit those 4 ram chips for 15 seconds each.
then put the xclamps back on
this is how i find my best success.. they last for a few months with this trick
option 2 would be a walmart scam. they are a little trickier now they they got the new warranty sticker but it can still be taken off with careful work.
http://www.youtube.com/watch?v=7UHwWB0f4gQ