If you have lots of money to burn, go ahead and try it, but it is an absolute waste of money on such an old system. A GTX 660 Ti for only $ 260 performs about the same as this $ 1700 card.
i'm agree but i need a professional OpenGL (not gaming card: geforce) with 4GB memory
i want use it in 3D software (cinema4D) and i have 2 display 27" working on 10bit content, geforce currenty have 8bit output content
K5000 have 1536 CUDA, should be work great in AE and Premiero Pro and video content will be on 10bit content (color grading)
In that case, go for it. See Tweakers Page - Balanced Systems and scroll down till you come to the video card table. The Quadro K5000 or the K4000 are the cards of choice, but pricey when 10 bit output is required. No reason the Z800 could not handle them. PCIe-3.0 is backward compatible with PCIe-2.0.
as i know quadro with kepler work on PCIe v2.0 (both HP and PNY)
PCI Express 2.0 x16:
only new FirePro card example W7000 works on PCIe 3.0
you have right, PCIe-3.0 is backward compatible with PCIe-2.0.
quick specs Z800 tell me this card k5000 not supported with z800
It's just not on a list of supported devices. Doesn't mean it won't work. In fact it does work on a Z800.
also i know on the market are three manufactures this card k5000: by HP, PNY and Fujitsu Siemens
there are any diffrence ??
Not that I know of; warranty and support are different of course: HP parts are covered by the system warranty (if it's from HP) - e.g. a 3-year on-site warranty in the US. PNY and others are only covered by their own warranty (usually 3-years depot).