I already have reflown it 2 times, well to be honest first time I soldered it I slightly knocked it while the solder was still melted and it shifted. One hour of way too excessive cursing on my clumsiness later I have reballed it and then reflown it again (reflow was after 3034).
Now that I think of it I did the 65nm with slightly smaller thermocouple, that was able to go under the substrate; the one I have now cannot do that, at least with lead-free solder. I probably have reworked it with new one being under the RX/TX pins - my TC needs to be on the back left side, closer to CELL, that might have messed things up. Pads on that mobo are probably begging me to stop reworking it, but I have to try again, at least BE is still at ~3ohms.
Also, kind of a off-top question, but do You guys rework RSX with IHS still on top of it? I tried delidding 40nm GPU when it was already delsoldered and I had to leave it on, because I couldn't even stick anything between RAMs and IHS. Even after soldering it delid was an absolute nightmare compared to 65/90nm RSXs.
Well, today I took off the RSX aaaand... one of Nx or Px solder balls was just missing. I just hope that's the only thing wrong with it, mobo besides these little resistors on which RSX sits looks like new, looks promising so far.