I consider myself a casual gamer; most of my time is spent in the on-line community "Second Life". I am experiencing a great deal of lag and though some of it may be on their side, I suspect it's time for me to upgrade. Here are my specs, sorry if I'm posting too much, not sure how much is needed for a good assessment. Please note that my psu is only 300 watts, so I am concerned that I will also have to upgrade it as well:
Windows Vista Home Edition/32 bits
Processor: Intel Core 2 Dual CPU @ 2.20 GHz
Disk Space Disk C: 342 GB Available, 455 GB Total, 342 GB Free
Disk D: 6266 MB Available, 10239 MB Total, 6266 MB Free
Upgrading to an 8800GT or 9 series would probably end up being more expensive for similar performance compared to the 5670 or 5570. They do use more power as well, though depending on the card, you may or may not need to upgrade the PSU. The 5570 and 5670 however will for sure run on your current PSU without problem.
The only thing about using an ATI is that they have a pretty bad rep with Second life users for some reason. Apparently they don't run SL as well as nvidia. Also, this particular one isn't on the list of recommended graphics card as stated here:
Well, use this ranking to judge that: http://www.tomshardware.com/reviews/best-graphics-card,...
The 5570 and 5670 are not on that list because they are newer and faster than many of the cards listed. The 5670 in particular is actually faster than all but the top of the 8800 series which is the top one they list on the requirements. Don't worry about it not being on the list- it WILL run it without a problem.