I own a 450 and I tried the 1650 pro with no luck.
If it is possible to return it then do that.
I returned mine and bought the XFX Nvidia 7600 GS 256 agp 8x
If you can get the 7600 GT that is even better.
The 7000 series is known for low power consumption and the 7600GS runs in my system with
two dvd-rw 2 ide hd's 1 scsi drive 1 creative audigy sound card and 3 extra fans with no glitches so far and I ran torture test benchmarks to make sure.
The 7600 gs is equal to a 1650 pro and the 7600 gt will blow it away.
I love my "Ol' Beast". My friends with lower level dual cores are amazed by it.
I run Left 4 Dead 2 at high settings (1280 x 800 2xaa 2xaf) with no glitch same with
Far Cry 2.
It is also a beast at encoding video with Handbrake and DvdFlick,