Should I get a higher wattage PSU?

[Vinny54]

I'm had a 500w PSU in mind for my first build, but since then have changed a few parts in favor of others and was wondering if I need to get a higher wattage PSU to accommodate the changes.

Board: Gigabyte h77
CPU: Intel i3570k
GPU: GeForce GTX770
RAM: Corsair Vengeance Blue 8 GB (2x4)
PSU: Corsair CX500m
SSD: Kingston 120GB
HDD: WD Blue 1TB
Disc Drive: Asus Black BC-12B1ST
Tower: Corsair Carbide 200R

Also, should I choose the H77 or Z77 for this build? I don't plan to overclock or use SLI/Croosfire either. Any other comments and help with the overall components list would be much appreciated. Thanks!

 

[MasterMace]

Should be fine on the CX500m, it offers 38A (456W) on the 12v, graphics (246) and CPU (121) should pull well under that.

I would wait to make this build a couple months for DDR4.

 

[inzone]

For the GTX 770 a 600w power supply is recomended as the minimum in the specs of the card. So I would go with a 600w Corsair.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817139048

or a 650w pus from Corsair.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817139020 This one has a $20 rebate.

 

[VincentP]

For your build, you need a power supply with at least 434W available on the combined +12V rails.
The CX500M is rated at 456W on the +12V rail.
This is OK, but only just.
Pushing it like this, the CX series may not last.

I would recommend the XFX Pro 550.
Much better quality supply.
Rated at 528W on the +12V rail.

If you need modular cables, then look at the Antec HCG 520M.
Quality is almost as good as the XFX and much better than the Corsiar CX series.
Rated at 480W on the +12V rail.

Most of the time you end connecting most of the cables to a modular supply so I don't think it offers much of a benefit.

How I calculated your power draw:
Core i7 3770K TDP = 77W
GTX 770 rated power = 230W
Allow 40W for other components
Total = 347W
Most of this is on the +12V rail, and we only want to draw 80% of the rated power.
347 / 0.8 = 433.75
Hence a power supply with at least 434W available on the +12V rail.