No No No Nooooooooooooooooo.
Get yourself 7950 please buddy, you can over clock it without voiding warranty and it'll come close to gtx Titan performance all for a measly price tag of £173.
In addition you'll get 3 free games from never settle forever.
7950 over clocked at 1150mhz will be about 3 times the performance of 7790.
http://www.hwcompare.com/13966/geforce-gtx-titan-vs-radeon-hd-7950-3gb/
You see stock 7950 has 80% of Titan bandwidth. You can over clock 800mhz to 1150mhz for about 40% more power.
http://m.novatech.co.uk/products/components/amdradeongraphicscards/amdhd7950series/fx-795a-tdjc.html
You can get saints row 4, tomb raider, far cry 3 etc for free.
For the love of god please don't buy 7790.
Intel core i7 930 OC @ 4.0 ghz
XFX Double dissipation Radeon HD 7950 356 bit 3gb GDDR5 OC @ 1150 MHz core + 1575 x 4 memory
Triple channel DDR 3 12gb RAM 1600 MHz








