By the way, the gtx 770 will fit in that case/mobo but will be bottlenecked by the old processor not to mention you most likely need a new PSU can you post full system spec?
motherboard: gigabite EP45-UD3P ultra durable 3
currently a nvidia gforce 9500 gt
memory: 4096 MB
OS:Windows 7 Ultimate
and i think thats it...
oh and i will change the power supply unit when i get the graphics card