HP Z4 G4/G6 power supply.

[Greybox]

HP Z4 G4/G6 PSU. According quickspec the 1000w psu has 2 variants (2x or 4x) 6+2 gpu plugs. Part# 851383-001/ L20514-001 is for the 2x. Anyone knows the part# for the 4x. Thanks All.

[SDH · Accepted solution]

I spent some significant time looking at the 1000W power supplies for the Z4 G4 and the Z6 G4, and never found one that has four 6-pin supplemental PCIe cables. I agree that is what it seems like HP is saying in those Z4 G4 QuickSpecs you show, but the same wording is not present in the Z6 G4 QuickSpecs, which uses the same 1000W power supply. I also went into HP PartSurfer and looked up highest wattage recent processor versions for those two G4 boxes. No unique 1kW power supplies were listed for them either. 

I've seen lingering mistakes in HP documentation, quite rare, but I think that is what is going on here. It could be related to the fact that the 1000W power supply you gave part numbers for have two of the 6-pin plugs plus each of those has a piggy-backed 2-wire plug leading off from each 6-wire plug end, to result in accommodation for video card(s) that have 8-pin female receptacles. That would negate the need for a special high amperage 6-pin to 8-pin adapter.

I assume you know about the high 18A rating of each of the two HP workstation PCIe supplemental power cables for these 1kW power supplies, which is higher than ATX standards. Plus, there is the 75W that comes up from each PCIe3 x16 slot, so there is quite a bit of total power available for 2 cards. Plus, I hope you know of the long-standing commentary here about use of the special HP-engineered adapters that can take the high amperage from each cable and convert each to two 6-pin plugs. Do the math... there is lots of wattage available to allow that and still meet ATX standards. Just use the HP adapters (or very high-quality equivalents) to avoid smoke and split the high amperage safely.

So, you can get four total 6-pin plug ends that way...

Probably just jumper wires...

[Greybox]

Thanks for the great info. Sounds like a documentation issue. The two 6-pin plugs do come with the extra 2-pin as shown in your picture. Gonna use a Cable Matters splitter to make a double 2+6 pin. Each plug provides 216W (18x12) + 75W from the slot giving a grand total of 291W. Going to run two Quadro RTX 5000 each draws 265W requires a 6-pin and 8-pin. So in total GPU 530W, CPU 140W and leave 330W for ram/others.  

[Greybox]

Found a Dell 8-pin to dual 6+2 from Dell T7920 1400W  PSU.  Any one knows a HP equivalent. 

[Greybox]

Just an update to show a 1000W  Z4 PSU with 4 GPU plugs (G1 thru G4).  Most models available for sale in eBay have 2 plugs. Wish I could read the PSU sticker hidden under the top cover.  I can only assume it would show 4 dedicated PSU rails similar to that a Z8.  Still looking for the model# of the 4 plugs variant.

[SDH]

Greybox,

Fascinating... If you have that Z4 G4 in your possession my recall is that you don't even need to disconnect any cables to slide the power supply out to the degree you could photograph the label. It is held in place by several rear screws that are pretty obvious and easy to reach from outside the case. Obviously, disconnect from the mains first. We'd all appreciate knowing this tidbit in greater detail.

Regardless, thanks much!

[Greybox]

The PSU label of this 4 plugs variant shows the  same part# as the 2 plugs variant. It appears HP uses the same part# for both variants which is odd. Most of the ones on eBay right now have 2  plugs. I have not seen one that has 4. From the label it is not clear how G3/G4 are wired internally unlike a Z8 PSU where G3/G4 has their own rails.