GTS 450 1 Gb on optiplex 760

Solution
The gx 760 mini tower has a compatible slot for the GTS 450 (one full height PCIe x16 slot) so you're okay there, but the GX 760 shipped with only a 305w PSU installed which is "borderline" for a GTS 450 as GeForce recommends a 400w PSU.

So be prepared for a PSU upgrade too if the card doesn't work through insufficient power being available to drive it. It only needs 106w but there may not be that amount available from a 305w PSU after everything else in your system has taken it's share.
The gx 760 mini tower has a compatible slot for the GTS 450 (one full height PCIe x16 slot) so you're okay there, but the GX 760 shipped with only a 305w PSU installed which is "borderline" for a GTS 450 as GeForce recommends a 400w PSU.

So be prepared for a PSU upgrade too if the card doesn't work through insufficient power being available to drive it. It only needs 106w but there may not be that amount available from a 305w PSU after everything else in your system has taken it's share.
 
Solution