Z800 power issue

[Snowey9]

I have a Z800 single CPU / 24G workstation.

I want to use it with Topaz software, which requires a reasonable video card.

I have bought a Radeon RX570, just about the only card you can currently buy.

This works perfectly when used with Gigapixel AI but if I run Video Enhancer AI the workstation immediatly falls over and reboots. Topaz believe this to be a power supply problem, which I agree with.

Since the Z800 is only using 200W of the 800W available how can I access a good power feed as the peripheral cable I have extended is obviously not up to it ? The power supply and motherboard do not seem to have another power connector.

thanks.

[DGroves]

the z800 uses a "multirail" type power supply, and you are overloading this rail with the 570 power draw,... unlike a singlerail design it's possible to exceed a single pwr rail rating (GPU in this case)  while still well under the power draw limits on the other rails

your best bet is to replace the current 300 watt video card with one that draws less power, i agree that your current card is most likely overloading the stock 800 watt power supply newer gen cards will provide same/better performance at less power draw

a nvidia 1080 ( not TI ) can be powered by the stock supply as it draws under 200 watts and is approx 90% faster

the 1080 TI is not suitable as it draws around 250 watts or more

or replace the stock 800 watt supply with the 1115 watt unit

[Snowey9]

Thanks for the reply

There seems to be a lot of mis-information going around about this card, incorect pictures, incorrect port descriptions and incorrect power requirements - My documentation states 150W max. If it had been any more I would not have bought it.

If the power unit is a typical one there will be multiple regulaters within the unit to independently feed various power lines. I know this design dates from 2008 but even in those days there were good video cards available, which is why the workstation was sold without any video card. So, I had assumed HP had an adequate power source to drive them. If they do, how do you access it ?

[DGroves]

if you have a AMD base card for the 570 it's indeed 150 watts and the 580 is 185 watts, however these cards are not that common compared to all of the 3rd party ones

your power various power ratings are due to who makes the board some 3rd party boards which are overclocked do draw more watts

HP posts video cards they have tested/certified in their z800 quickspecs, you can look at this note the highest end model card hp offered and note it's wattage, and if it required the upgraded power supply

if you have a AMD base card for the 570 it's indeed 150 watts and the 580 is 185 watts

i do know the HP AMD v7900 is a 150 watt card and is spec'd for the z800 800 watt supply PROVIDED YOU MEET THE SYSTEM SPECS of one low power cpu and only two 3.5 HD's and one or two pci-e cards that draw 25 watts or less each

https://www.dectrader.com/pdf/quickspecs/13278_na/13278_na.html

[Snowey9]

Thanks for the reply

I have never seen this quick Spec document, I thought I had every one but obviously not, thanks.

Reading the specs shows that all the listed cards pick up their power from the motherboard, which explains why there is no sepperate power feed. All the cards listed are of course obsolete, but probably available on e-bay, which is where I got all the bits for the Z800 anyway.

The problem now is that they all only support DirectX 11 whereas Topaz requires DirectX 12.

So now I need a good graphics card that takes all its power from the motherboard and supports DirectX 12. Not being a "gamer" or into graphics I find this whole busines confusing, There are two manufactures of GPUs, that bit is easy, but there are lots of users of these chips, all with different specs and many with missing information - like where they get their power from.

Is there a web site that actually lists them with all the facts please ?????

Thanks

[DGroves]

has your video card been tested? do you know for sure it's a working card?, again if it's a base 570 card without any overclock

and is a 150 watt supply it should work (post a pict of the card please)

the z800 DOES NOT get graphics power from the motherboard, the two six pin GPU AUX power connectors (800 watt supply or three (1115 watt supply) cables run along the right side of the case up to the power supply at the top

the nvidia 10xx series and up are dx12 compatible

you will need the 1115 watt supply and the 3 plug gpu wiring harness to upgrade your system, or just buy a used system with the 1115 watt supply

refer this post for the wiring harness part number, as they are the same between the z800/z820 as i recall

https://h30434.www3.hp.com/t5/Business-PCs-Workstations-and-Point-of-Sale-Systems/HP-Z840-with-850W-...