alu7616 :
as far as i know the CPU is an AMD FX-6300, 2x4gb of Corsair ram, a Gigabyte motherboard and a corsair cx430w psu. price for the card would be optimally under £100. Honestly anything is better than the 9400gts in it at the moment
95W power consumption of your CPU
430W bronze 80% = that will take 400W max from the wall.
Your system without graphics card will consume about 150W ( max usage )
400-150-100( 100W in a reserve so you won't get any PC crashes or your system won't shut down when playing )
= 150W consumption max for a graphics card
*
Recommendations :
GTX 650 ti ( 110W power consumption ) - 100£
+ higher performance
+ lower power consumption
+ kepler based GPU ( that is used in the high end card )
- cost
R7 250 (140W power consumption ) -80£
- mid performance
+ lower cost
+ higher power consumption
- weaker than 650 ti
Buy GTX 650 ti if you can afford it, in my country it costs 3300 Crone wich is 100£