Hi Please note there could be other graphics card that might work , however the tested and standard graphics on this unit is as given below for HP 280 G1 Microtower Business PC
GRAPHICS
Integrated
Intel Integrated HD Graphics or HD Graphics 4400 Varies by Processor
Discrete
NVIDIA GeForce 705 1GB DDR3 FH GFX 30W (optional)
It is suggested to use the hp tested graphics card to avoid any compatability issues.