Help!

[VietTank]

I have a 500w power supply, and I'm planning to get a NVIDIA GTX 650 Ti Boost 2GB which requires 450w. Will I have enough wattage in my power supply since other things are using wattage.

[Domokun_index]

If it actually took 450w out of your PSU then no you wouldn't have space. but it only takes like ~150w-200w.

[[MPGH]Doc]

Depends what else you have running off the PSU.

[VietTank]

I have
My current Graphics Card
GIGABYTE GV-N430OC-1GL GeForce GT 430 (Fermi) 1GB 128-bit DDR3 PCI Express 2.0 x16 HDCP Ready Low Profile Ready Video Card

3 of these fans and 2 other fans that came with the computer
Rosewill RFA-120-K 120mm Case cooler

Heatsink
ARCTIC Freezer Xtreme Rev. 2 CPU Cooler - Intel & AMD, Twin-Tower Heatsink, 120mm PWM Fan

[Domokun_index]

I have
My current Graphics Card
GIGABYTE GV-N430OC-1GL GeForce GT 430 (Fermi) 1GB 128-bit DDR3 PCI Express 2.0 x16 HDCP Ready Low Profile Ready Video Card

3 of these fans and 2 other fans that came with the computer
Rosewill RFA-120-K 120mm Case cooler

Heatsink
ARCTIC Freezer Xtreme Rev. 2 CPU Cooler - Intel & AMD, Twin-Tower Heatsink, 120mm PWM Fan

and your CPU?

[VietTank]

and your CPU?

Amd Quad core fx-4100

[Domokun_index]

Amd Quad core fx-4100

I believe your PSU consumption for your CPU is ~100W.
So yeah, you'd need to upgrade your PSU.

[[MPGH]Doc]

Use this to calculate.

ASUSTeK Computer Inc. -Support- Recommended Power Supply Wattage Calculator

It's not very accurate but at least it overestimates your requirements rather than underestimate. Looks like you need around 550-600W based off that, but I'm sure you can survive off 500W for now.