Hi, am inspired how you're able to use old HP workstation doing this. I was trying on old HP workstations but fail to get more than 3x GTX1050ti work (75w each). PCIE 1to3 or 1to4 expansion cards won't work either on both motherboard pcie slots.
I have tried slotting GTX1050ti into PCIE Slot 2 as well primary display (75w draw from motherboard direct) - not able go beyond 3x GPU as well. Actual GPU power draw should be much lower around 63w each.
- HP XW600 (475w) - Motherboard/CPU support: LGA 775
- HP Z200 (325w) - 503397-001 LGA 1156 motherboard
Generally,
- GPU0 in Slot 2 (tried on riser as well)
- GPU1 & 2 powered by PCIE 6P Y split pins + SATA (no split) on each riser
- GPU3 powered by SATA to riser (6P) - SATA should be able to supply 92w to riser ... Not able turn on.
Note: I didn't use Slot 4 PCIE (carries 75w) to connect to PCIE 1to3 expansion card though. Not sure whether the USB cable connected to riser does carry any wattage from motherboard to risercard though without need be powered via SATA/Molex.
Much appreciate your shared experience on this have a few of above workstations to repurpose.