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I would highly recommend NOT overclocking any of the cards that were "repaired" by removing the shorted MOSFET. Until someone does some power calculations for what is dissipated in each MOSFET at load with one MOSFET removed and referring to the datasheet for maximum input power, current, voltage as well as dissipation, I'd be very careful.
I wonder if these MOSFETs can be bought online and soldered back on as long as the traces and pads are not destroyed. If someone had a schematic of the voltage regulator sector of this card then it might be possible to reconstruct your own circuit and bypass the original traces (i.e. ghetto wiring job). I doubt microwave frequencies are present within the MOSFET network so electrical length doesn't matter much.
Good luck with the ones that work though - it sure is a deal! Hopefully they continue to work after a year .
I just did a search on 32N03S, which I believe is what the top of that ship reads (looking at the OPs pictures) and came up with this part number: BSC032N03S. It is a surface mount component with eight pins and these are not that difficult to solder one just needs to get some solder paste.
I'm sure you can OC the card, you just need some decent cooling for the remaining mosfets. There are waterblocks available to replace the little black heatsink but its just not worth doing because they're so damn expensive.
so very very tempting... just not sure if it's worth the risk