A year ago, I purpahsed a cheap PC (200-250 euros).
These are it's components:
CPU: Intel(R) Celeron(R) Dual-Core 2.66GHz
Mobo: Gigabyte GA-H61M-S1 (I'm not sure)
GPU: Non-Intergrated Intel(R) HD(R) Graphics 4500
RAM: Kingston Hyper X Fury blu 4 Gb stick 1333MHz
PSU: I don't know
Today I bought a Gigabyte(R) GeForce(R) GTX 650 OC with 4GB VRAM (there wasn't any gtx 650 with less vram)5000Mhz VRam frequency and 1110 MHz clock speed. I read that it needs at lest 400W from the power supply. I am not sure if the PSU have them, but I hope this. The PSU model number is on it's top and I don't want to pull out the PSU, so how many watts do u think the PSU have from that build (~200-250 euros)?
The only way to be absolutely sure is to read the label. Of course I can't see you setup, but it could be as easy as removing the 4 screw that hold the PSU in the case and rotate it until you can see the label. You shouldn't even have to unplug any of the cables from the motherboard, drives, etc.