What to upgrade first GPU or CPU?

[passo1987]

Hi every1. Not sure if thats the right section but I have question about upgrading my pc . ATM I have :
Cpu: Phenom x4 9750 2.4 Ghz
Mobo: Acer da078l boxer (aka piece of ****)
Ram: 4gb (2x2gb) ddr2 800 mhz
Gpu: Sapphire Radeon HD 7770 Ghz edition
Psu: WinPower 500w
Case: NZXT Phenom 240
I want to make some upgrades but atm I can't spend to much (£250 max) ,
So not sure what first cpu+mobo+ram or gpu+psu.
Can u please help me with that? Thx

 

[passo1987]

Not more than £250 . Thats why I want to do it in 2 .
For gpu and psu I was thinking about r9 280x plus psu or gtx 770 and psu .
For cpu I want i5 , mobo + 8gb ram . Just not sure which one first

 

[passo1987]

I use pc for gaming , rpgs most of the time , far cry (also 4) , lords of fallen , skyrim ,witcher . I playing on 1080p , even now but with low graphics

 

[passo1987]

Thx for ur advice , I'll have a look on 2nd hand gpus atm and save more money to upgrade all in one go in future