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09-05-2018 05:46 AM
I'm having my HP Z800 since around a year and a half now and wanted to include a new GPU into it.
A friend of mine and me opened the Z800 today to see about the PSU and how it looks in there in general (I only knew it from videos so far).
I read quite a few forum posts about this matter so far but none of them seemed to fit to my problem exactly.
My Z800 includes:
PSU: 850 W
48 GB RAM
1x Intel Xeon x5650 2,66 GHz
Nvidia Quadro 2000 1GB
I'm actually unsure now if it is possible to run for example an Gtx 1080 on it due to the PSU (from what I read in other posts)
Product no. is FF825AV if that helps
09-05-2018 09:31 AM
for the z800 (and z820) systems HP requires the optional 1100 watt supply when using two high power cpu's (over 120 watts)with a high end HP approved video card, and either a sec video card or video coprocessor, 4 HD's and all memory slots filled
the stock 850 watt supply is for one or two 80 watt or lower cpu's one hp approved video card cd rom, 2-3 hard drives and half, to all memory slots filled
what you have to understand is that because the HP power supplies are multirail, removing the total draw from the CPU 12 volt rail will not help with the wattage draw on the 12 volt GPU rail
in a multirail power supply each voltage is seperate from the others, and you can not draw more that the max stated amps
from each rail so even if the CPU 12 volt rail is under the max wattage/amps, you can still trip the supply off if the draw on the GPU 12 volt rail is to high
the HP z800/z820 power supplies pop out very easy and should have a label showing each rails max amps
09-05-2018 09:50 AM - edited 09-05-2018 09:51 AM
both the 970/980 and 1070/1080 cards will work, as long as they are not overclocked or factory overclocked (TI) versions
a overclocked video card or "TI" model can draw over 230 watts compared to the 180 watts of the factory stock models
you will need a 6 to 8 pin power splitter if using the stock 850 watt power supply which has only two 6 pin gpu cables on the z800
i currently run a GTX 970 on my z800, but i have the 1100 watt supply
09-05-2018 02:41 PM
Checking Passmark 3D baselines, the eleven highest performing GPU's in z800's are: Radeon ProWX 9100 (230W), GTX 980 Ti, GTX 1070, GTX 1080, GTX 980 Ti, GTX 980 Ti, GTX 1080 Ti, GTX 1070, GTX 980 Ti, GTX Titan Black. Ten of the systems had 3X CPU's, 6 are 56XX series and 5 are 55XX series. The W5590 and X5690 have the majority of the high 3D marks as they have higher clock speeds.
The highest 3D mark using the Xeon X5650 has a GTX 1070, scoring 3D of 8305, the second mark is 8178 from a Titan X, and third is 7963 using a GTX 980 Ti. Those are all dual X5650. The fastest single X5650 system runs a GTX 570 (specs for 550W PSU) for a 3D of 4446. I would suggest staying with GTX 7XX or newer series as they use less power, have more CUDa cores, higher clock speeds, and more modern Direct X and OpenGL.
I don't know the specifcation of the z800 power supply but the PCIe slot provides 75W and the GPU power supply rail is likely to run at least at 11A, as it does in the 825W z620. As 11A x 12V = 132W and 132W + 75W = 207W explains how the z800's above can run these high performance cards. However, if running dual CPU's, it's definitely advisable to change the PSU to the 1125W.
Our forum friend Brian1965 has a z620 overclocked to 4.8GHz and on the 825W power supply, runs a GTX 1080 Ti and a Quadro P2000. The Quadro P2000 is 75W and runs on the PCIe slot power only. I have a z620 overclocked to 4.3GHz and was running a Quadro P2000 + GTX 1070, but at the moment am running only a GTX 1070 Ti (3D = 12132).
As the CPU clock speed will impose some limits on 3D performance, In my view the best cost/performance choice for the z800 would be the GTX 980 Ti, but the GTX 970 is very good as well.
If you need strong GPU performance in 3D, consider upgrading the CPU to higher clock speed. I had very good results in Dell Precisions T5500 (similar to z600 and T3500 (similar to z400) using the Xeon X5680 6-core @ 3.33/ 3.6GHz and the 4-core X5677 @ 3.47 /3.73GHz.