I basically want to upgrade the GPU without causing any bottleneck. If you think I can get a better GPU when upgrading my PSU then please link of both of the upgrades.
Two years back I sent my comp to HP to fix an issue with the old GPU ATI 4650 HD (some sort of buzzing sound). They replaced it with a ATI Radeon 4670 HD but the same thing is happening now again. So this is why I want to buy a new and better one.
GPU without upgrading PSU:
Upgraded GPU and PSU:
This is my computer. The link at the bottom is a direct link to the website of HP and contains more details I guess.
Mainboard : PEGATRON CORPORATION Benicia
Chipset : Intel G31/G33/G35
Physical Memory : 8192 MB DDR2-SDRAM
Processor : Intel Core 2 Duo E7300
Frequency : 2666 MHz - (current : 1599.99 MHz)
Number of Core : 2
Support : Socket 775 LGA
Cache L1 : 2 x 64 KB
Cache L2 : 3072 KB
Voltage VID : 1.125 V
Thermal Design Power : 65 W
PSU is 300W.
Link to the website: