So i have a http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c01792852&lang=en&cc=us&taskId=101&contentType=SupportFAQ&prodSeriesId=3942792&prodTypeId=12454 HP e9150t and yes I know it was a bad decision to buy a pre-made crappy HP "gaming" computer but I can't undo that now so I'm trying to make the best of my bad decision. It has 8GB of RAM and is a i7 920 @ 2.67 ghz. The one I configured has a nVidia gts 250 in it and it cut the mustard for about a year but nowadays it's just not good enough to get decent frame rates at my 1920 x 1080 native resolution at decent settings. I want to maybe try and upgrade the GPU, I was thinking of maybe getting a GTX 460 as an upgrade as the nVidia website says that the minimum PSU requirement is a 450W. I'd LIKE to get a 560 Ti but the PSU requirement is 500W and I have a PSU with 460. My question is: even though I know the minimum required for the 460 is a 450W PSU do you still think it would be safe to run in my system? I mean my PSU meets the minimum requirements but is there still a potential problem? My other question would be: is it possible/advisable to put a new PSU in a crappy pre-fab system such as this? I mean, I could put a new psu in and go the 560 Ti route then but only if this is a viable option. Lastly: Are either of these option likely to present cooling or airflow problems in my loser HP case? If anyone has ideas I haven't thought of (short of buying a new PC which is not really an option right now) feel free to present them as well... Thanks!