I stumbled across this video and found it really helpful; thank you. I have a Z800 and a Z840 but have never needed to change the Power/GPU harness out thankfully. I purchased the Z840 for £150, as it was missing a left side access panel (CPU/Memory/PCI slot side / with handle) and had damaged plastic feet. Searched eBay for months until a bare Z840 case appeared, so I snapped it up. Just replaced both side panels and the feet. The Z840 and Z800 Left Side Panel are physically interchangeable - obviously, different colours and with different system diagrams silk screen printed inside. The Z840 Right Side Panel includes the plastic foot (You can just see it in the video at 14:30 & 25:35) HP Spare Part Numbers are: HP Z840 Left Side Panel / Bezel (Has handle) HP P/N: 745065-001; 790088-001 HP Z840 Right Side Panel Assembly (Has the right foot) HP P/N: 745063-001; 790087-001 HP Z840 Left and Right Side Access Panel Set - 704998-001; 508043-002 and/or 508044-002
Thank you for making this video, taking the time to walk us through. This one is going to grow in popularity and go down into history of building a Z840 for the home ;-)
Clever option with the deep socket. Your description at the start of the vid didn't sound right, but watching you use it to remove those clips... it made it a breeze!
Hi, There are still 6 pins blank on the white connector on the feft hand side (at 19:05) once installed, could this possibly be space for another 6 pin connector made from carefully reusing/cannibalising the old cable? Do the pinouts match on the psu to enable this? If so, it would be a way of expanding the capabilities of this mod to enable a more power hungry graphics card, or perhaps even a Tesla card or or dual card sli setups, or something similar.
I love how you paid close attention to my video! Thank you for that! :-) Yes, I was in fact thinking the same thing as I was doing this video. I could remove the 6-pin from the old hardness and add it to those open 6-pins to add another 6-pin PCIe connector. I think it would work, but haven't tried it yet. The label on the PSU seems to indicate there's a "G4" that can also do 12.2v@18A.
@@ArtofServer Thank you, I would love to see a follow up video from you on this, as i have the same setup as you, just doing the psu swap, inspired by your video, and would like to power another GPU inside this Great Workstation.
You can also just buy a 450w atx compatible psu and run the pci-e rails through the back, done that in a pinch before. The top of the Z840 has a recess that allows a psu to sit up there neatly.
@@ArtofServer it's ugly, lol, but the width of a PSU fits snugly between the left and right "walls" up top. Two power cords, and the 450w needs a jumper to put it in the "on state"...it's a temporary solution while one waits on the correct parts to arrive, lol.
Thanks for the kind words. I don't have any video that goes into detail about the HP Z Turbo Drive G2. However, I typically use the Samsung PM981A M.2 SSDs in those.
Wow, it's always something isn't it? I'm sort of in a jam as my HPZ 230 PSU died and I want to install a non HP ATX PSU but am told it will be a hassle because of the 11 pin power connection on the MB, and even though there are adapters available, there is something about the OE PSU requiring a higher stand by voltage? then the 5v most non HP PSU's produce. Some say that after such a swap they must use the new ATX on/off switch instead of the computers original on/off button. So I'm trying to find info on my situation, but I watched this one till the end because I learned something new and you always make informative videos. Nice job.
Thanks for watching! Yes, HP does use a different standby voltage in some systems. They also change that between generations of their own machines. So for example, you cannot adapt a Z820 PSU to work in the older Z800. Or a Z840 PSU in a Z820. I don't know why they can't stick to the same and standard standby voltage - seems really silly.
@@ArtofServer - Thanks for your reply. I don't want to spend on a new ATX PSU and adapter if the swap won't work properly. Looks like I'll most likely roll the dice on a used OE HP PSU.
Just got the z840 and, despite having made sure it had the 1125W power supply, upon checking unfortunately the harness only had the one GPU cable. I looked at the links you provided and scoured the internet but the harness does not seem to be in stock anywhere. Any chance you can share the wiring diagram for the other 2 coming out of the back of the PS? I'm thinking of cannibalizing the wires from another single harness and adding them to the existing one. Provided I can find the single harness or a barebones z840 somewhere for parts/etc. Great video and thanks in advance!!!
oh no! i guess someone swapped the PSU on your Z840 and didn't change the wire harness! The 6-pin PCIe connector on the back is the same as your existing ones, you just need to add 1 or 2 more in the available spaces next to it. so, I would just follow the same pinout as the 6-pin you already have. double check with multimeter afterwards to check you're seeing 12V and GND on the expected pins on the side you plug into GPU. Should be 3x 12V in a row, and another row of GND.
@@ArtofServer Thank you sir! Yes I thought I'd do a continuity test on existing wires but also wanted to make sure the PS connector didn't have like a skipped column in between sets of wires for each GPU. Thanks again for the tip and for all the informative videos. So far you've helped me with my R720 and now the Z840
Update: After days of unsuccessfully searching for that harness I believe I found an alternate solution. My goal is to be able to run an RTX 3060 but with just one 6pin gpu power cable I could have used an additional one for sure. Per the manufacturer, the card is rated at 170 Watts. This may be overkill but rather than just going with a single 6to8 adapter, and to ensure there's enough power to feed it, I've decided to over engineer a bit: 1- PCIe should deliver 75 Watts off the bat 2- Use a 2x6pin to 8 Pin 3- Connect the existing gpu power cable (should be enough at 225 Watts BUT...) to one of the female 6pin in #2 4- Use a 2xSATA to 6pin and connect to the other cable in #2 and power from the 2 spare SATA cables already sitting unused. 5- Use the 8pin from #2 to the GPU Again, the math does indicate overkill but just wanted to make sure there are enough wires to handle currents (on an already relatively low power card).
Great video thanks! Very helpful. One quick question. Can I use a different model fan with the same size and volts but maybe slightly different amperes? What I have is 12v DC 0.60A Rev A 92mm x 25mm so can I buy another one which has the same specs but is 0.5 amperes maybe or slightly different amperes?
i did buy my PC with the 1125 w power supply, the only thing i had to do was leave out the bottom cover , my video card was bigger then the space needed, i am able to put the outside cover back on.
I'm surprised there is a full-on 850w MODEL of the z840. These machines are so large, and made to such massive enterprise bulk orders, you'd think they'd just prebuild the entire chassis and just swap out PSUs as needed.
I've had the Dell T7910 for a while. Everytime I saw my son's Z800, I just wished I had a Z8xx instead ... and then I had an idea of how to maximize an NVMe array's performance while still having data redundancy and the Z840 fit the bill a little bit better for me in that case. Future videos will provide details on this topic...
The PSU's for those are extremely expensive... Your sometimes better off buying splitter cables. I've been repairing many of the HP Z series Power Supplies including ones with 18 & 12 Pin non-standard pin outs.. They are worth fixing as some replacements are over $200 USD... DPS-750AB-36, DPS-1050DB & D12-925P1A
I don't think I need to upgrade the PS for my application; however, I recently upgraded the BIOS and/or restored to factory defaults. I believe it was at that time I began to get "525-Configuration requires Front Chassis fan(2) and this fan is not detected." during POST. I checked I have an 850 watt power supply, and there is no 2nd fan. BUT! it's been running for months without that post error? I've searched the web and explored the BIOS several time but can't seem to find how to eliminate that POST error. Any ideas how POST decides if I need the 2nd fan?
That's interesting. I only saw that error when I upgraded the PSU. I thought it was due to the PSU upgrade, as the error went away when I put the old PSU back in. So, I'm not sure how you got that error??? I would dig around the system setup menu and see if there's some setting there... please let me know if you figure it out!
@@ArtofServer For now I found a four wire CPU heatsink fan in my lab that inhibits the POST error :-) which allows me to stay on track trying to pass a display adaptor to a Windows VM in Proxmox and run a physical monitor on the VM, (I've got the mouse and KB passed through). The HP Z840 is way overkill for a workstation in this application I can use some of that excess performance for other eXperiments...
I was able to get them at a fair price. But I saw them selling for a lot more elsewhere. In general, it's a hard to find part, so prices may be volatile.
from the looks of it. it seems to me the connector has a lot of "blanks". wouldn't just replacing the connector with the new connector done the trick with out replacing the entire PSU?
No, the 850W PSU doesn't have the necessary rails for the GPU PCI-E power connections (6-pin). See this section of the video ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-HKSc5l0cvsw.html for 850W PSU specs.
@@the_retag will the 4090 work with the pci 3.0 slot? I thought those needed pci4. Not being snarky. Serious question bc that’s one of the issues holding me back on buying a z840
@@Sam-tb9xu yes, pcie is backwards compatible like usb. A pcie 3.0 device should also work in a pcie 5.0 slot. It simply runs at the lower speed. And with a gpu it should only cost you 5% or so performance as long as you have a full x16 connection. But if you have 4090 money i'd still go for a more modern Plattform with at least pcie 4.0, because it does make a difference for storage and may become more important for other stuff in the future as well (direct storage access for gpu or something like that is in development afaik, as well as fast usb 4 ports one might want to add)
He showed that in his video, if you have 3x6 pin connectors you have a 1150W. If you have only 1 it should be a 850W. Alternative is pulling it out and looking at the label. But if you have 3 6 pins, you are good for >1150 watts if I understood correctly,. Thanks, @Art of Server !
