Will My Computer Work? (Upgrade)

[James-GP]

I have been thinking about upgrading my HP Computer to make it a gaming rig. I am new to this, but from the research I have done, I think these are the parts I want to get (See Specs Below). I am going to transfer all the hardware into a Cooler Mater case and replace the GPU and power supply. Basically, can I do this? Will it be compatible and will anything be bottle necked? Thanks

Current Computer- HP h8-1234
http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&dlc=en&docname=c03359045&lc=en&product=5231389

Specs:
* AMD FX-6120
* Gigabyte Micro ATX Motherboard -
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c03353629&lc=en&cc=us&dlc=en&product=5231389
* 10 Gigs of DDR3 RAM
*Radeon HD 7450
*1 TB 7200 RPM Hard Drive
*300 Watt Power Supply

New Parts:
*Cooler Master Half Tower Case
http://www.newegg.com/Product/Product.aspx?Item=N82E16811119197

*NVIDIA 660 TI GPU

*800 Watt Power Supply

 

[AMD Radeon]

sounds good

except for 800 PSU. get XFX 550 or corsair 600 instead

 

[James-GP]

sounds good

except for 800 PSU. get XFX 550 or corsair 600 instead

I am trying to learn more about computers, so can you explain why I should get a 550-600 PSU?

 

[AMD Radeon]

I am trying to learn more about computers, so can you explain why I should get a 550-600 PSU?

because they are nice spot for price/performance. even hardcore gamers hardly need above 700W. mostly just stay with 600W. you could spend more to SSD or upgrade the CPU

 

[James-GP]

because they are nice spot for price/performance. even hardcore gamers hardly need above 700W. mostly just stay with 600W. you could spend more to SSD or upgrade the CPU

Ok thanks a lot! I'm really excited to put this together and game without trouble!