HP z 840 pci-e and versions

[Tony_atfpodcast]

I'm looking at the spec sheet and it is saying the PCI-e is only x2?  There is no x3? Also how many generations of the 840 are there? I know for my z420 there are 2. One you can run v1 and other v2 xeons.

[CinéMatica]

The HP Z840 only runs on v3 and v4 Xeon processors.

There is no PCIe gen 3 available on any Z840. If you want PCIe gen 3 you have to step up to the HP Z8 G4.

[SDH · Accepted solution]

1.  Below is what HP says about the Z840 slots... most are PCIe3.  You'll be able to see this cut/paste image from the HP technical and service manual shortly (page 56).  Go google "c04823811 pdf" and take a look yourself:

2.  Unlike the ZX00 and ZX20 families of HP workstations there are no two versions for the ZX40 family, which is nice.

[CinéMatica]

You are completely correct! My bad.

I got it mixed up with the HP G4 Z8. 

The Z8 has no PCIe 2 slots.  Therefore I bought a refurbished HP Z840.

My apologies for the misinformation!

[Tony_atfpodcast]

Wow my z420 has gen 3. odd

[Tony_atfpodcast]

How would I know if the 840 I want to get has a x3 and not the x2? Is there a motherboard code?