QUOTE(Grifter357 @ Nov 28 2010, 12:41 AM)

Where do you get those heatsinks for the ram chips and how do you stick them on, with apoxy..?
Thanks,
BTW, I like to use the heatgun method and a flux pen.
Flux underneat the chip is always recommended when doing a reflow. The flux will get burt underneat the chip so doing another reflow in the future probably wont do anything anymore.
My last xbox went RROD after a reflow a few months ago. I pour alchol underneat the GPU and blow it dry using warm air hoping it will clean the old flux entirely. Did a heatgun reflow and still no luck. I know it was dead so I went ahead and remove the GPU completely. The old burnt flux is still there and there is no way another reflow would ever work with all the junk left underneat the GPU. Reball would be the only option in that state.
So I would say reflow with flux once and proper. Avoid getting any thermal paste underneat the chip as this would reduce the chance of successful reflow.