the 9600GT uses a bit more power than the 8600GT, which is probably a bit more than the 8500GT, though I had trouble finding anywhere that had similar tests with numbers for both 9600 and 8500 so I could get comparable numbers (they all did total system draw with different systems). What is your PSU now? You may need a little more for a 9600GT, but your current PSU might be enough.
Well at the moment I have a 450 Watt PSU which is working 100%, just don't know if it will still be able to work that fine if I swap my 8500GT with a 9600GT in its place.
The current hardware I have in my pc is
CPU: Dual-Core E5200 @ 2.50Ghz
Motherboard: Eletegroup G31
RAM: 1 x 1GB DDR2
Hard Drives: 1 x 250GB SATA & 1 x 500GB SATA
Graphics card: GeForce 8500GT 1024mb
CD/DVD Rom: 1 x DVD RW PATA
My system case also has 3 fans, 1 x 80mm LED fan along with 2 x 120mm LED fans.
Basically I listed everything in the case that consumes power that I could think off quickly that makes a difference.
Please give me your opinions on if it will work if I swap the 8500 with the 9600 or do you think I need more then a 450 watts psu?
+1 to Shadow- a good quality 450W will be plenty for your system with a 9600, or even something more powerful. The 5670 is faster and still uses about the same power as the 9600GT as well. The 5750 or 5770 are faster still, and should still be totally acceptable on that PSU.
It covers every card made in the last 5 years or so. It can get a little tough to read when things overlap, but down below the charts there are links to reviews for each card model.
You can use it to safely find replacement cards by finding the card you currently have, then finding others in it's wattage range. By doing so you should not have a problem when using any of them. It's quite the resource.
5750's barely need the PCIe cable. 4870's need two
And yeah, I go to it often when recommending things. I don't share it all that much, though do I have some rather aged posts where I cited it a few times. Most of the time it serves as my Trump card when some idiot's claiming some BS wattage and amperage figures