HP z640 Workstation and Nvidia GeForce GTX 1080 Card

[MtothaJ]

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@Fandel wrote:

I have a Z620 with a GTx 1080 and when I play BattleField it gets crap FPS.  If you look at thsi site they saying this shoudl work fine.  Why is this thing not using my of my GPU and pumping out more FPS.  The CPU does not look like i tis holding anything back. 

https://zworkstations.com/products/z620/

70% CPU

30-40 % of GPU 

20% Mem use

FPS end up at 40-60 in game all drives clean installed nothing running in background

I have done all the different BF Setting 

Enable performance

Sync off

Change Med HIgh Ultra

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What CPU do you have?

Also, check GPU-Z to see if you are running the card at 3.0x16. If its a v1 Sandybridge CPU it is likely that you will have this as 2.0x16 and in that case you need to download a patch from Nvidia to enable 3.0x16. Not that this will make a significant difference (guessing 2-5fps tops) but every little bit helps.

[Fandel]

I have the Intel® Xeon® Processor E5-2603 4C 1.80GHz with the aditional CPU so 8 Cores 2 CPUs in total.  I have looked at the slot and it is runing at 3 and not 2.  It has slot 2 and 5 for 2 cards if you wanted and slot 1 is being used by the aditional CPU.  I also changd it in the BIOS from Auto to be sure at one point and nothing.  

It is like the CPU is not pushing the informatoin to the video card.  Neither one of them are working that hard with CPU at 70% and Video usage at 40%. 

[MtothaJ]

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@Fandel wrote:

I have the Intel® Xeon® Processor E5-2603 4C 1.80GHz with the aditional CPU so 8 Cores 2 CPUs in total.  I have looked at the slot and it is runing at 3 and not 2.  It has slot 2 and 5 for 2 cards if you wanted and slot 1 is being used by the aditional CPU.  I also changd it in the BIOS from Auto to be sure at one point and nothing.  

It is like the CPU is not pushing the informatoin to the video card.  Neither one of them are working that hard with CPU at 70% and Video usage at 40%. 

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A couple of things:

- the card should be in the number 2 slot

- download GPUZ-Z and check the PCIe speed. Most likely you are running the card at 2.0x16 and need the patch to unlock 3.0x16

- your CPU speed is very slow. For gaming you would be best advised to go for a single CPU setup and get something with more single core speed e.g. E5-1650 

[Smeden]

This question is most likely outdated by now. But here's my 2 cents....

Bear in mind:

Power rating PCIe: 75W

Power rating 6-pin connector: 75W

Power rating 8-pin connector: 150W

Both the Z420 & Z620 PSU has 2 * 6-pin power for GPU => PCIe+ 2 * 6-Pin = 225Watt.

( Which is the highest consumption for a GPU in Z420/Z620 according to specifications )

AFAIK all GTX 1080 cards needs at least 6+8 or dual 8-pin supply = 300W minimum.

The GPU's input power-rails are not nessessary connected in parallel =>

If a 6-pin supply is plugged into a 8-pin slot ( and for some odd reasons it fits ), you might "starve" some of the GPU-VRM's or some VRM's could be without power at all.

This could lead to malfunction or like in Fandel's case just a performance decrease / throttling.

The PSU in Z420 and the Z620 are 600W/800W respectively.

Depending on the power requirements in the system, a 2*Molex -> 8-pin + 2*6-pin -> 8-pin adapter might work.

However. This is an experimental suggestion and should be done on own risk.