Upgrading GPU; do i need to change MOBO and PSU?

CT1983

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Feb 27, 2014
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Dear Sifus,

I have a fairly old PC with below spec :
CPU : Intel Core 2 Quad
MOBO : Gigabyte ep45-ud3p
GPU : GeForce 8800GT
RAM : 4GB
PSU : Antec 650W

I play a certain MMORPG that demands high graphic, it was fine for a year or so then starting last few weeks, somehow things are slowing down. I get frequent graphic lag while playing, screen freeze, then GPU keep restarting (windows system warning shown) to the point of BSOD. Thought it was heating problem caused by dust, then i cleaned up the PC and the problem is gone, however graphic performance severely downgraded.
I upgraded to latest driver with clean install (334.89 WHQL) and things becomes even worse (5-10FPS while idling in remote town). So i rolled back to previous driver (320.18 WHQL i think) although not to original performance, but still barely playable.

After tinkering for quite sometime with no result, i decided i want to upgrade my GPU to the new GTX750Ti.
if i do this, with my current setup, would i need to upgrade my MOBO/PSU?

If i do need to upgrade MOBO, means i have to rebuild my whole system, i am going with below setup :
CPU : Core i5 4570
RAM : Kingston HyperX 1866Mhz (Pair) 8GB
GPU : Asus Geforce Gtx 750TI 2GB DDR5 OC
MOBO : MSI Z87-G45 (Gaming)
PSU : ?

Will this be a good setup? Although, rebuilding my PC will be my last-last resort.
Thanks in advance for the input!