Help with SLI

I'm kinda new to the whole build it yourself, and I was just gonna upgrade a couple parts and now it has turnt into a whole new system, so got a few questions, but first (here is what I ordered so far, can still be canceled since I just ordered most of it if theres a reason to cancel and change something).

Mother Board: ASUS P7P55D-E Pro LGA 1156 Intel P55 SATA 6Gb/s USB 3.0 ATX Intel Motherboard

CPU: Intel Core i5-750 Lynnfield 2.66GHz LGA 1156 95W Quad-Core Processor

Ram: G.SKILL ECO Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600

Video Card: GTX 480

Main purpose of the system is for gaming. I'm now planning to order a 2nd gtx 480 but I need some advice.

a.) I know nothing about 64-bit and what makes a system 64-bit. Will this system be 64-bit? assuming I install a 64-bit version of windows of course?

b.) What power supply should I get? My current OCZ 600watt power supply surely will not handle 2 gtx 480 gpu's
In case you need to know what else will be on the system power wise, there will be a sound card, a dvd burner a blu-ray burner, nvidia 3d glasses/rf emitter, 3 monitors (dont think monitors consume power from computer but just in case). and other then that I can't think of anything besides 6-8 usb items that could be plugged in at any given time.

c.) Cooling.... Here is what I currently have:

case: ENERMAX Uber Chakra ECA5001B Black Aluminum / Steel Trim w/250mm Intake/Exhaust LED Monster Fan ATX Full Tower Case w/Front I/O 1 eSATA, 4 USB2.0, Audio I/O

rear fan: 120mm 6000 rpm
front fan: the one that came with the case
side fan: the one that came with the case
cpu cooler:

Thanks for any help in advance.
4 answers Last reply
More about help
  1. a) A 64-bit system consists of a 64-bit processor & and a 64-bit operating system really.

    b) To play it safe, a 850W PSU is what you'd want - a good power supply is the Corsair HX850W.

    c) Another cheap cooler (not from newegg, it's there but overpriced) is the Cooler Master Hyper 212 Plus which should be available for around $35 on other sites.
  2. Will the i5-750 bottleneck me? with 2 gtx 480's?
  3. Also can I still SLI even if there not the exact same card? there both evga and there both gtx 480's but there different models/clock speeds

    I switched my processor to the i7-875k
  4. You need a 1000W power supply to safely run GTX480's in SLI. Just one uses around 375. You'd really be pushing an 850w. I have a Kingwin Mach1 1000w and enjoy it. The military style modular connectors plus good reviews is what did it for me. Also Corsair, Silverstone, Antec, & Thermaltake all make nice 1000W PSU's. And yes you can run the same chipset from diff vendors. I have 2 BFG GTX260/216's in SLI and they are set at diff clock speeds.
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