HP Z800 RTX 2080 Ti - cutting out issue (full stop) Update

[dava4444]

Hi

In this thread (which is since locked) I was having problems with a Z800 and Palit RTX 2080ti..

The TL DR is... It was an incompatible PCIE revision.. the card doesn't work properly with PCIE 2.0 power (75w).

I marked a solution in the other thread.. and while that helped things.. three months later it burned through those cables too.

I now own a Z840 w/ dual Xeon E5 2660v3 and 1150w 80Plus Silver and the 2080ti has worked from DAY ONE of owning the new system. (July 2020)

I write this to help the community ..  maybe you can avoid the troubles I had.

peace Dava

[DGroves]

the poster said he tried to run a 250 WATT 2080TI on a z800 with the stock 850 watt supply, i'm not surprised he had problems as this overloaded the stock 850 watt supplies GPU power rail, it has nothing to do with the PCI 2.0 bus

also cheap no name 6-8 pin gpu adapters will cause issues like melted adapter wires. 

the fastest/ most power hungry card HP approved for use was The "FX5800" which was a 190 watt card

AND HP REQUIRED THE OPTIONAL 1110 / 1250 WATT SUPPLY IF THIS CARD WAS USED

the hp z800/z820 workstations unlike today's single rail power supplies use multi-rail power supplies

on a multirail supply, each rail has a preset wattage that can not be exceed,

and the total of all rails equals the supplies max wattage

on a single rail supply the GPU wattage is whatever free wattage that is not being used for other things is available for GPU use up to the supplies max wattage

here's someone who posted that the 2080TI does indeed work fine when using the upgraded 1115/1250 watt supply and a quality 6 to 8 pin adapter

https://h30434.www3.hp.com/t5/Business-PCs-Workstations-and-Point-of-Sale-Systems/HP-Z800-RTX-2080-T...

[dava4444]

Hi DG

I'm the OP for both threads. Perhaps you didn't read the OP thoroughly as this was just meant to be an update .. to help anyone with the same issues,

I actually upgraded the Z800 to the 1250w. same problem.

I was going round in circles for a long time.. I switched to the Z840 and everything was solved. I can only assume it's the power drawn from the PCIE 2.0 slot of 75w.. I'm pretty well versed with Computers.. but even I took it to a local professional, he said what I am saying.

[DGroves]

as i stated "quality" 6 to 8 pin GPU adapters are a problem problem in that's it's impossible to visually look at a adapter and determine if said adapter is using thinner copper strands in the wires and substandard metal for the actual connector pins and a cheap plastic body most people are unaware that "MOLEX" is a actual brand/product and that cheap GPU adapters use knockoff molex look alikes

the only way to get around this is to either buy the HP adapter for around 20.00-50.00 usd

https://www.cdw.com/product/hp-power-cable-8-pin-pcie-power-to-6-pin-pcie-power-3.5-in/3821590?cm_ca...

or buy the "MOLEX" branded parts from a electronic distributor like mouser or digikey and roll your own if you require a custom adapter

some major pc venders try to sell quality adapters, but it's hit or miss as the company buyer usually  has little to no knowledge in the field of determining what makes a good 6/8 pin adapter

i personally ran a factory overclocked evga nvidia 1080 TI (FTW3)which draws 280 + watts  in a z800 with the optional 1115 watt supply using the HP 6 to 8 pin adapter

if you want another confirmation, you can contact any major video card vender (or nvidia) directly and ask tech support if their 2000/3000 series video cards are PCI-e 2.0/3.0 compliant

https://greenpcgamers.forumbee.com/t/36nrak/hp-z800-gaming-computer-blog