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09-13-2018 02:12 AM
I wanted to add GTX 1080ti graphics card to my HP z820 system .. how can I do that and the card need 6 & 8 pin power connectors ?
09-13-2018 05:32 AM
unlike the stock 1080 cards which draw 180 watts, the "TI" cards draw 230 watts due to this you can not run the "TI" card on the stock HP 850 watt supply you will need the 1250 watt optional supply for reliable operation. while the system may power up using the card/850 watt supply it will be exceeding it's design limits and may not run reliably.
the reasion is due to HP using what is called a multirail power supply instead of a single rail. in a multirail supply each part is a seperate section which means that the cpu 12v is seperate from the GPU 12v and so on for the +5 +3.3 volt rails due to this it's possible to overload a single rail, while still being under the supply's total wattage
nowadays, most of the indurstry has moved to what is called single rail, where all voltages come from one main 12 volt supply with digital chips regulating the main 12v down to all othe other needed voltages. this design does not care about each 12v/5v3.3v since it all comes from one source
the "TI" cards use two 8 pin power connectors unlike the normal 1080 cards that have one 6 pin and one 8 pin
so a "TI" card requires two 6 to 8 pin adapters
there is also the ASUS 1080 "TI" card that uses 3 eight pin connectors and draws over 330 watts
09-13-2018 09:24 AM
The NVIDIA specification for GeForce GTX 1080 Ti requires a minimum 600W power supply and connects using 1X 6-pin + 1X 8-pin connectors.
Forum friend Brian1965 uses a GTX 1080 Ti + Quadro P2000 in a z620 running an overclocked Xeon E5-1680 v2 on an 825W power supply. In Passmark baselines there are 10X z820's, 6X z620's, and even 5X z420's running GTX 1080 Ti's on a 600W PSU.
When buying a GTX 1080 Ti, watch for cards that are taller than two slots and.or very wide. I had dimensional issues with both GTX 1070 (MSI = too wide) and GTX 1070 Ti (ASUS Strix = too tall) in a z620. The Founder's Edition GTX 1080 Ti is among the most compact.
09-13-2018 12:25 PM
Here is the link to my original post.
As per BambiBoomZ post above, I would recommend the founders edition (FE) version of the GTX 1080ti.
04-03-2019 05:46 AM - edited 12-07-2019 01:15 PM
To assist those who come across this old post in the future, I would like to offer my experience with the 1080 Ti GTX GPUs and modifications to an HP Z820. As mentioned above, to have multiple Nvidia GTX 1080 ti video cards inside an HP Z820 workstation, you will need the 1125 WATT power supply or PSU. If in Europe the 1125 automatically becomes 1400 Watts due to higher voltage EU grids.
The Z820 will accept up to three Nvidia 1080 Ti cards. You will be able to use three of the existing 6 socket power cables and purchase from HP an adapter to create 8-pin connectors. The 6 pin will power up to 150 watts, so this is within wire gauge and power draw safety. The 1125W PSU will theoretically power up to three 250W GTX 1080 Ti cards, however the legacy cables inside the Z820 do not configure well for the third GPU. For the third card you can install a second PSU inside the case with a second power cable. The motherboard has three full PCIe X16 slots and the dual CPU and quad RAM is ample to handle three video cards.
If you would like assistance or clarity on adding three 1080 Ti video cards, feel free to message me or ask here and I will explain the exact procedure.