GTX 460s SLI: Newegg choices = very confused

Now I'm confused. I was planning on getting a pair of Evga 460s. But I don't know if there is a difference besides the core clock and shader clock on each card? Can all these cards be OC to 850mhz?

1) A+B = OK i figured (A) has lifetime warranty and (B) has 2 yrs. Do I really need the lifetime warranty if I don't plan to use the 90day step-up program?

2) A + B + C = can I clock them them to be stable at 850 clocks?

3) D = it has the highest core and shader clock, why is the cost lower?

4) I have Cosair 650w PSU on my main computer or should I switch the Antec 750w that I have on my other computer, is it enough power to clock to 850mhz on SLI?

5) Instead of 460s, if I went to do SLI 480s, how much power or PSU wattage would I need to be safe? >>>2 EVGA GTX 480's (regular cards non superclocked) with Bitspower Black Freezer pro water blocks.

A) EVGA 01G-P3-1373-AR GeForce GTX 460 (Fermi) Superclocked EE $170

B) EVGA 01G-P3-1373-TR GeForce GTX 460 (Fermi) Superclocked EE $157

C) EVGA 01G-P3-1371-AR GeForce GTX 460 (Fermi) FPB EE $146

D) EVGA 01G-P3-1380-KR GeForce GTX 460 (Fermi) SSC+ $140
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More about 460s newegg choices confused
  1. Get it here instead of newegg. No mail in rebate BS. Their pricing has been lacking of late.

    Warranties on video cards don't need to be that long considering gamers usually replace then every 2-3 years anyways.

    GTX 460s in SLi will use 550-600W max load with an overclocked system. 480s in SLi would require something like a 900W PSU.
  2. Thanks you so much for the link and info, newegg just sold out today, but has this software bundle I can resell to offset the cost so I would have to see what's best.
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