The 750W one uses a ton of other caps, too, which I can't identify:
How come only the primary cap concerns you? I thought the secondaries fail quicker, hence why 85C rated secondaries are absolutely unacceptable but 85C rated primaries are somewhat acceptable.
As quoted from here http://www.jonnyguru.com/forums/showthread.php?t=9477
"Personally, I find that the secondary caps are the most commonly failed component of PSU (If they're a junk brand like fuhjyyu or capxon, that is)."

How come only the primary cap concerns you? I thought the secondaries fail quicker, hence why 85C rated secondaries are absolutely unacceptable but 85C rated primaries are somewhat acceptable.
As quoted from here http://www.jonnyguru.com/forums/showthread.php?t=9477
"Personally, I find that the secondary caps are the most commonly failed component of PSU (If they're a junk brand like fuhjyyu or capxon, that is)."