I've a old PC with the following configuration :

MOTHERBOARD : Intel Desktop Board D945GCNL
PROCESSOR    : Intel® Core™2 Duo CPU E4500 @ 2.20GHz
RAM              : 3gb DDR3 RAM 667 (2+1)
HDD           : Seagate barracuda 500gb 7200RPM
PSU                   : zeb-450w sata plus

My Budget is 20k. I had an idea of buying a r9 270. Any ideas and suggestions ?