need power supply help, pls

[KarmaKills]

Yo, just was about to buy a 750Ti Graphics card and it said it required a 400wat power supply, i blindly looked on some forum of my pc specs and allegedly had 500wat so i was like mmkay,

turns out i cracked it open and only got a 350 wat power supply, how do i go by getting a bigger power supply, how much are they and do i gotta find one dependant on my pc? im guessing a power supply is basically just a transformer so the pc doesn't explode

where or what should i look into

or is there a graphics card equivilant to a 750ti that could do the job?

[Wicked]

There is a tech and PC subforum in General, better to post there.

[KarmaKills]

There is a tech and PC subforum in General, better to post there.

thanks mate

[fl4zh]

Just go for a 550W, that's what I run with.
My specs:
CPU: Intel i5-4460
Motherboard: MSI B85M-E45, Socket-1150
Ram: Crucial DDR3 BallistiX Sport 1600Mhz 8GB KIT
GPU: Asus GTX 750 Ti 2GB OC
Hard Drive: Shitty Hard Drive (SHD)
Case: BitFenxi Shinobi
Power Supply: Some shitty 550watts