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HP Recommended
HP Z420
Microsoft Windows 7 (64-bit)

Hi All,

I have some quesstion regarding HP z420 .I  have z420  motherboard version 1 with Intel xeon e5-2690 ver 1 and also with RAM's.
I want turn on it ,but I don't have the Hp z420 power supply. Instead I have z400 power supply, and connected it with 24 ->18 adapter to z420 motherboard and I have checked the pinout of adapter and board, all are right.This power supply fully works with z400.
When I turned on the z400 power supply without connected z420 board,I listen just one clicking voice from inside of supply and the coller of supply starts to run.
When I connected this supply to z420 board It doensn't works.I listen constantly clicking voice from inside of supply and coller of supply doesn't works.

Also I have checked short circuit between board pinout powers to GND.All is ok.
Maybe the wattage is low,as this power supply is 475W and the +12V wattage is about 456W ?
Could you please help ?

Thanks in advance.


HP Recommended

the HP z400 power supply is NOT ATX COMPATIBLE the 24 pin connector does not match the ATX 24 pin out


the power supply adapters/ converters for the z400/z420 are different and not interchangeable


you are currently shorting both the z400 power supply and the z420 motherboard and this will cause damage to both


buy a z420 adapter AND A STD ATX (not z400) Power supply




one last bit of info, avoid those cheap no name power supplies or those 700 watt for 30.00 units



HP Recommended



Actually there are 3 pins different for ATX and z400 power supply pinout and those pins aren't used in this adapter.
I have this adapter and checked it pins.
Please see the picture.If I mistaken let me know.




HP Recommended


HP Recommended



If the intention is to have a usable workstation, consider selling everything and buying a working z420 with a Xeon v2.  The complications of matching proprietary parts, and the cost of an additive system part by part is a considerable additional effort and expense. Starting with a working system, it's possible to have use of it almost right away and  improve it gradually.


For example:


Purchased for $136:


HP z420_3: (Original) Xeon E5-1607 v2 (4-core / 4 Thread @ 2.8GHz) / 4GB (1X 4GB DDR3-1866 ECC unbuffered / NVIDIA GeForce 7100 GS / WD Blue 500GB / 400W PSU > Windows 7 Professional 64-bit (HP OEM ) 
[Passmark System Rating: = 569 / CPU = 5492 / 2D = 538 / 3D = 60 / Mem = 1117 . Disk = 864 ] [Single Thread Mark = 1509 9.27.17


And, about $450  of mostly used parts later:


HP z420_3: (2015) (R12) Xeon E5-1650 v2 (6C@ 4.3GHz) / z420 Liquid cooling / 64GB (8X 8GB HP DDR3-1866 ECC registered / NVIDIA GeForce GTX 1060 6GB/ Samsung 860 EVO 500GB + HGST 4TB / / 600W PSU > Windows 7 Professional 64-bit (HP OEM )

[Passmark System Rating: = 5637 / CPU = 15217 / 2D = 776 / 3D = 10923 / Mem = 2901 Disk = 5163 /Single Thread Mark = 2382 [4.30.21]


The v2 version Xeon E5's have higher clock speeds, supports more cores, and should be useful longer as well.




HP z620_2 (2017) (R7) > Xeon E5-1680 v2 (8C@ 4.3GHz) / z420 Liquid Cooling / 64GB (HP/Samsung 8X 8GB DDR3-1866 ECC registered) / Quadro P2000 5GB _ GTX 1070 Ti 8GB / HP Z Turbo Drive M.2 256GB AHCI + Samsung 970 EVO M.2 NVMe 500GB + HGST 7K6000 4TB + HP/HGST Enterprise 6TB / Focusrite Scarlett 2i4 sound interface + 2X Mackie MR824 / 825W PSU / Windows 7 Prof.’l 64-bit (HP OEM) > 2X Dell Ultrasharp U2715H (2560 X 1440)

[ Passmark Rating = 6280 / CPU rating = 17178 / 2D = 819 / 3D= 12629 / Mem = 3002 / Disk = 13751 / Single Thread Mark = 2368 [10.23.18]


† The opinions expressed above are the personal opinions of the authors, not of HP. By using this site, you accept the <a href="https://www8.hp.com/us/en/terms-of-use.html" class="udrlinesmall">Terms of Use</a> and <a href="/t5/custom/page/page-id/hp.rulespage" class="udrlinesmall"> Rules of Participation</a>.