Buying a New Computer- Need a Little Help (Powersupply, GPU)

[Ceetee]

So, I have decided I will be buying a new computer and finally replace my Mid 2011 Intel Core i5 iMac (due to the screen not working, I am currently using an external monitor and the main computer is far to bulky). I have been using macs for quite a while now but, as a gamer, they are far to limiting and expensive to upgrade. So, I am looking to buy a new computer.

I am looking at this computer here . I am a little concerned however that the GTX 660 I buy may not work with the power supply due to the fact I can't find any information on this kind of thing. Does anyone have any advice on how to find out if the power supply (and motherboard) will support the GPU?

Thank you,
Calletha

Quick edit: More specifically, I can't find out what the powersupply used in this computer is!

[chazus]

It's always dicey on prebuilts what power supply they'd have. I'd recommend doing something like this. $100 cheaper, and a better CPU

PCPartPicker part list
CPU: Intel Core i3-4130 3.4GHz Dual-Core Processor ($119.99 @ Newegg)
Motherboard: Asus H81M-K Micro ATX LGA1150 Motherboard ($42.99 @ Newegg)
Memory: G.Skill Sniper Series 8GB (2 x 4GB) DDR3-1866 Memory ($68.00 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($59.98 @ OutletPC)
Video Card: MSI GeForce GTX 660 2GB Video Card ($164.99 @ Newegg)
Case: Antec One ATX Mid Tower Case ($29.99 @ NCIX US)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply ($59.99 @ NCIX US)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer ($14.99 @ Newegg)
Operating System: Microsoft Windows 8.1 - OEM (64-bit) ($94.98 @ OutletPC)
Total: $640.90

[Ceetee]

It's always dicey on prebuilts what power supply they'd have. I'd recommend doing something like this. $100 cheaper, and a better CPU

PCPartPicker part list
CPU: Intel Core i3-4130 3.4GHz Dual-Core Processor ($119.99 @ Newegg)
Motherboard: Asus H81M-K Micro ATX LGA1150 Motherboard ($42.99 @ Newegg)
Memory: G.Skill Sniper Series 8GB (2 x 4GB) DDR3-1866 Memory ($68.00 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($59.98 @ OutletPC)
Video Card: MSI GeForce GTX 660 2GB Video Card ($164.99 @ Newegg)
Case: Antec One ATX Mid Tower Case ($29.99 @ NCIX US)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply ($59.99 @ NCIX US)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer ($14.99 @ Newegg)
Operating System: Microsoft Windows 8.1 - OEM (64-bit) ($94.98 @ OutletPC)
Total: $640.90

I have always been paranoid about building my own PC. I am scared I will screw something up. Changing ram was one thing but doing all that mess is just really intimidating. Do you think the new-egg guide is a good one for general build instructions?

[chazus]

The newegg guide is pretty good, IMO. Building now is a lot easier than before... especially with quality parts. A lot of people mistake crappy DOA parts for "I broke it"