NOTE: Slots two, four, and five are PCIe GEN3 slots. Slot two is the primary graphics slot; slot five is the
secondary graphics slot.
Slots three and four use open-ended PCIe connectors, so a PCIe x16 card can be inserted. This allows the
workstation to support more PCIe x16 expansion cards. A x16 card typically trains and runs at the maximum
lane width available by the expansion slot. The card runs at the reduced lane width, with a corresponding
performance decrease. Graphics cards greater than 75 watts require the use of an auxiliary power cable
adapter.
HP Z640 Workstation installation sequence recommendations
Load
order
Card description Slot 1 Slot 2 Slot 3 Slot 4 Slot 5 Slot 6
1
Second System Board
(Riser)
Only
2 First PCIe graphic card Only
3
Second PCIe graphic card or
High Performance GPU
Compute card
Only
4 PCIe 1394b card Only
5 Third PCIe graphics card Only
6 Fourth PCIe graphics card Only
7SAS card 1st 2nd 3rd
8 Z Turbo Drive 1st 3rd 1st 2nd
9 Z Turbo Drive 2nd 2nd 1st
10 PCIe audio card 4th 1st 2nd 3rd
11 PCIe Network (LAN) card 4th 1st 2nd 3rd
12 eSATA bulkhead kit 4th 1st 2nd 3rd
13 Serial port bulkhead 3rd 2nd 1st
NOTE: Slot sequenced from the rear I/O aperture to the board edge.
Component replacement guidelines 55
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