Z840 with (3) three 2080 Ti GPUs?

[zero-13]

So my first ASUS Turbo 2080 Ti is arriving tomorrow, which I ordered based on the kind advice I received from the awesome people in this post: https://forums.chaosgroup.com/forum/...occupy-2-slots

I had originally planned on having two 2080 Ti, but based on Muhammed_Hamed awesome quad setup, now I'm dreaming of eventually adding three 2080 Ti.

The thing is, I cannot find anyone online that has installed three 2080 Ti in their Z840.

I have the 1125W PSU in my Z840 but it only has (3) three 6-pin PCIE power connectors... I ordered 6-pin female to dual 8-pin male adapters but I'm kind of scared to connect a single 6-pin supply to the ASUS to test it out. Since I have no idea what the effect might be if the GPU draws more power than the single 6-pin line can supply, I imagine electrical fires and possibly portals spewing out monsters ala Half-Life?

This is a very popular and widespread workstation so hopefully someone in our great community might have at least attempted it or know if it's possible?

My two Titan blacks each had one dedicated 6-pin supply adapted to 8-pin and the third 6-pin supply I had split between the two with a 6-pin to dual 6-pin adapter and they ran flawlessly for years.

TL;DR: Has anyone successfully installed three 2080 Ti in a Z840, and if so how were they wired up for power?

Thank you in advance for any guidance and/or perspective you can provide.

[Muhammed_Hamed]

Unfortunately you cannot use splitters for your new 2080tis, they will crash in GPU rendering or any kind of workload really
each 8 pin cable has to be separately coming from your power supply. You cannot use 2 8pin coming from one cable.
This can affect your new cards on the long run if you attempt to run your setup this way
Needless to say your Power supply is not rated and probably unbranded. It is quite popular for HP, Dell and Lenovo to cheap out on their PSUs for their high end workstations..
Your only option is to buy an external modular power supply that has enough 8 pin cables for 3 GPUs. Then you can buy 24pin splitter as your external power supply will not start unless it is connected to your Mobo. This splitter will allow you to connect both your power supplies to your Mobo
I have tested this before and it works without issues, see below

[Muhammed_Hamed]

And of course make sure you have 3x PCIe slots that are x8 at least. You can check the manual for your board to see if this is the case

[zero-13]

Muhammed_Hamed Thank you very much for the very thorough and detailed knowledge you have been sharing, I really appreciate it!

I will definitely stick with just two GPUs, I installed the new Asus a little while ago and have it wired up as I had my Titans so far so good, thanks for the recommend.

I also ran Redshift benchmark @ 9:15 before closing up the case and I had a thirty second improvement over the previous failed Zotac, I'm excited to get into testing it out with some V-Ray scenes.