HP / PNY K5000 diffrence? should work on HP z800

[3dimensionproject]

hello
there are any problems with running it (Part No: VCQK5000-PB by PNY or C2J95AA by HP)

on the hardware platform HP Z800 (PN: FF825AV) ??

2x xeon 5550 with 24 GB RAM

quick specs Z800 tell me this card k5000 not supported with z800
http://h18000.www1.hp.com/products/quickspecs/13278_na/13278_na.PDF
in this situation i'm frustrated, HP support is not able to answer me

also i know on the market are two manufactures this card k5000: by HP and PNY
there any diffrence ??

i'm know SLI not working on Z800
http://www.nvidia.com/object/quadro_sli_compatible_systems.html

Best regards
Artur Kucznier