I have heard that the HD5770 takes up more than one slot. Do I have enough room for it? Also, should I measure how much space I have in my computer before purchasing the card? I believe the HD5570 is around 8". Also, I'm afraid that my 450W PSU is a no name brand since I did not custom build this computer. I bought it from bestbuy. Do you think the my PSU actually has an output of 450W or something more like 300W?
Here is some more information:
This is the PCI-E 2.0:
Of my three PCI-E's, only one currently has no device.
Here is more information on my 4 CPU's: