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i have ended up getting case with 850 psu. now stuck at heathinks.
is the re any alternatives to expensive original (G0J48AA) ones?
thx.
P.S. have found this rather questionable alternative. dont feel enthusiastic tho:
http://www.ebay.com/itm/HEATSINK-FOR-HP-Z820-WORKSTATION-636164-001-with-Fan-647113-001-/232232385612?hash=item361220fc4c:g:Dg8AAOSwopRYmeVJ

P.S.S. ram is another point. got myself Atech 32GB KIT (2 x 16GB) DIMM DDR3 ECC Registered PC3-12800 1600MHz Dual Rank RAM Memory. with single cpu (ES 2670) post reports a ram error in ANY upper slot (5-8). modules swap ain help. similar issue could be found on hp forums using other ram manufactures. perhaps glauder could comment on this. pls share ram options who have tested already. cheers.

Your cabinet has the fan assemby? If you do not have the rams overheat and make mistakes. I had this problem and solved with cooling.
The Z820 has the VRM heatsink very near to the cpu0 rams.
My ram is this:

http://www.ebay.com/itm/48GB-12x-4GB-HP-500658-B21-500203-061-501534-001-PC3-10600R-DL360-G6-G7-RAM-/182461591849?hash=item2a7b8ef129:g:e2wAAOSwtfhYq2N5

I buy it for Z800, but I gave up on him and then I got another 16GB for Z820. Low voltage memories (1,35v) are useless, the Z800 and Z820 use them at 1.5v so they spend the same energy as ordinary memory.

I still have to troubleshoot the warnings, but press F1 and ok.

I never bothered eliminating them and to this day I'm still pressing F1 on startup!

The usb and 1394 dont is critical, but the fan error i need solve. I'm doing reengineering in the fan conector, i already buy the male connector in digykey, end of the month should be coming.

yeah, 12v rail, makes sence. care to share the purchase link for 1125@150ish? i couldn find 1125 on US ebay less then 350ish.
i ve foud a deal at amazon for 275USD /case+850/:
https://www.amazon.com/Z820-Chassis-Power-Supply-642163-003/dp/B018WRL6I2/ref=sr_1_2?ie=UTF8&qid=1487253780&sr=8-2&keywords=z820+power

hoping 850 will cover 2x2670/ram and single 1080.
cheers.

I bought at mercadolivre.com a brazilian auction site. I was lucky because I bought when I posted that first message and there were no chinese cables, so the power supply dont sell well. The seller was a year advertising and lowered the price for me buy.
Who does not buy the cabinet, i recommend getting a Z420 motherboard is ATX size dont need case mod. The Z820 need case mod and has serious heat problems, the memories fry! I had to buy nine 12cm fans to put on the sides of the cabinet, plus two 14cm inside and one 8cm fan to blow air into the power supply. Not counting the two hyper 212s for the cpus.

dear glauder - bravo and grazie!
have u considered taking that original PS apart to clone it with regular PS? i can imagine more then just 5-11v difference, so, someone tech savvy should give a try.
cheers.

No i dont considred it. The original power supply have 1125w and 90% eficiency. Power supply for Z820 has got a lot of power at 12v rails , (Z820 use only 12v rail). ATX power supply with this feature are very expensive and the original cost me cheap, only 150U$ in my country.
I plan to redo the cables, I'm extracting the pinout from the original cables.
And good news the 18 pin connector pinout has been posted on the HP foum:

https://h30434.www3.hp.com/t5/Business-PCs-Workstations-and-Point-of-Sale-Systems/HP-z420-motherboard-18-pin-layout/td-p/5835021

this is strange as the z820 uses the same 850W as the z800: Delta DPS-850DB A

Both Z800 and Z820 850W PSU have different PN# That may explains the different pin out.

In the end I bought a Z820 barebone, to save cost and time. I'll try to do a trace on the main harness loom when I get a chance.

hi Dan,

Please the front usb 2.0, usb 3.0 and 1394 have a grounded pin to detect the presence of the cables. Would you like to check which ones are?
thanks!

Yes its works, have a step-up voltage converter for convert the 5v to 11v, see the big retangle in the midlle of cable.

how about this?
too good to be true? or maybe it works?

https://www.aliexpress.com/item/PSU-ATX-Power-Conver-Cable-24-Pin-to-18-Pin-8-Pin-to-8-8-6/32778125250.html?spm=2114.01010208.3.26.8wxmvO&ws_ab_test=searchweb0_0,searchweb201602_2_10065_10068_10501_10503_10000032_119_10000025_10000029_430_10000028_10060_10062_10056_10055_10000062_10054_10059_10099_10000022_10000012_10103_10000015_10102_10096_10000018_10000019_10000056_10000059_10052_10053_10107_10050_10106_10051_10000053_10000007_10000050_10084_10083_10000047_10080_10082_10081_10110_10111_10112_10113_10114_10115_10000041_10000044_10078_10079_10000038_429_10073_10000035_10121-10503_10501,searchweb201603_3,afswitch_2,single_sort_1_default&btsid=b717394b-36e5-4670-962f-0b43b7726bd4

Hi,

Power supply are incompatible, lousy sellers!  Z800 have 5v sb, z820 have 11vsb, different pinout too.
I buy the cables:
HP Z820 Memory and CPU Power Cable New 647111-001 - cpu and memory power.
HP Z820 Motherboard and ODD Power Cable Assembly 647108-001 - power the board/memory fans.

and make the mod using the original power supply.
the front panel pinout is posted in HP forum.

The details are in this blog that I did, because I had nowhere to put the pictures.
use google translator.

http://glauderghinozzi.blogspot.com

I still have to troubleshoot the warnings, but press F1 and ok.

hi obnauticus!

• The pinouts are completely different. I do not have access to a Z820, just have a motherboard and power supply.
  I post pictures of them tomorrow.
  For make a z820 mod you need buy the original power supply and motherboard, and someone needs to buy and extract this cable connections:
  HP Z820 Memory and CPU Power Cable New 647111-001 - cpu and memory power.
  HP Z820 Motherboard and ODD Power Cable Assembly 647108-001 - power the board/memory fans.
  HP Z820 Power Button with Speaker New 644320-005 - front panel cable
  



• The board size is 33,1cm x 36,2cm, tomorrow i make the measure of holes.
  



• I got the pinouts using a multimeter in continuity mode. Measure the continuity between the power supply housing and the pins to find the GND ( ground lines).
  Then I turn on the source (connected to power because it activates alone) and measure the voltage in the pins. Pins that were in near 0v and were not GND, were identified as signal.
  

No Problem!, thanks Andy!

Hello Davidk!

The power supplys are different, I bought a 1125w. The main differences are that the Z800 has 5v standby (5VSB) and Z820 11v, making it incompatible  with all ATX power supplys of market. The power supply starts without even being connected to the motherboard, which means that it PS_ON pin is unlike ATX it shuts down the source, would be a PS_OFF.
I measure the voltages of 3 connectors (C1, C2 and C3), below are the outputs, they were numbered by looking at the front of connectors, left to right:



                                   C1

   1 |  2  |    3  |  4  |  5  |  6  |  7  |  8  |  9 |  10 | 11  | 12  |
-12V |  X  | 11Vsb | 12V | 12V |  X  | 12v | 12v | GND|  X  | GND | 12V |
GND |  S  | 12V   | GND | GND |  X  | GND | GND | GND|  X  | GND | 12V |

                                   C2

  1  |  2  |  3  |   4 |   5 |   6 |   7 |   8 |   9 |
GND | GND | GND | GND | GND | GND | GND | GND | GND |
12V | 12V | 12V | 12V | 12V | 12V | 12V | 12V | 12V |

                                   C3

  1  |   2 |   3 |   4  |  5  |  6  |  7  |  8  |  9  |  10 | 11  | 12  |
   S | 12V | 12V |  12V | 12V | 12V | 12v | 12v |  S  | 12V | 12V |  S  |
GND | GND | GND |  X   | GND | GND | GND | X   | GND | GND | GND | 12V |

X - missing pin
S - unknown signal pin, there are 4 of them, three of them should be the PS-OFF, PSU_ID, PWR_OK, the last i have no idea.

Before you can connect the following cables are necessary:

HP Z820 Memory and CPU Power Cable New 647111-001 - cpu and memory power.
HP Z820 Motherboard and ODD Power Cable Assembly 647108-001 - power the board/memory fans.
HP Z820 Power Button with Speaker New 644320-005 - do not know if the power button is the same as the z800. It has a great chance of being equal!

If someone buys the cables please share the pinout!

From the maintenance guide was possible to extract the following information:

C1 - Has three SATA power connectors (D1, D2 and D3), 2 IDE (D4 and D5) and a HDD bay (H1) these are not important, it what matters is the P1 output that goes to motherboard .
C2 - Is just three outputs PCI-standard and strength so it is an easy out to do.
C3 - Are the connectors P2, P3 and P4 that feed both CPU and memory.

After we get the pinout of these connectors, will be possible to connect the card to the original source. If we discover the function of the mistery pins I think it will be possible to make changes to connect to a common  ATX power supply.

Sorry the English, automatic translation!