I don't see any single slot 460 from evga, only one from galaxy and kfa. But they are long so I have my doubts of it with the air duct around your heatsink. Your computer is low end and you never stated your cpu. You might be better off going with a 450.
bottlenecks ??!!! i have a friend who is using the same card on CPU Daul Core 3.00 Cashe 2MB ( Without OC ) and he was running whole games like COD OPS and Battlefield Bad Company 2 at Highest Performance and it was Smooth Very Smooth i saw that with my own eyes and couldnt believe it