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- Nvidia Tesla k40 pci slot: which one?
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09-28-2020 07:27 AM
Hi to all, do you know if are there any differencies relating performance mounting tesla k40 in slot 2 or slot 5 (both pci 3.0). It is coupled with a nvidia k2000. Thanks for your help
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09-28-2020 11:06 AM - edited 09-28-2020 11:10 AM
Please download the Maintenance and Service Guide from the manuals section of the HP Z620 Support page.
Page 88
K2000 in slot 2, K40 in slot 5 - This is the recommended/optimum configuration.
09-28-2020 11:06 AM - edited 09-28-2020 11:10 AM
Please download the Maintenance and Service Guide from the manuals section of the HP Z620 Support page.
Page 88
K2000 in slot 2, K40 in slot 5 - This is the recommended/optimum configuration.
09-28-2020 01:09 PM - edited 09-28-2020 01:17 PM
do you guys know if slot 5 gives a sensible performance improvement? I mounted in opposite direction: slot2 for egpu and slot5 for primary card.
Tesla K40 is a very big card and i need to make cable arrangment on lower side to mount on slot5: in the picture I mounted nidec fans on back because this is a fanless k40
09-28-2020 01:45 PM - edited 09-28-2020 02:11 PM
I have a Quadro P2000 and a GTX 1080 ti in my Z620 system. The main use of the GTX card is for compute (CUDA) video rendering since it has 3584 CUDA cores and plenty of VRAM. I can also use the GTX card for occasional high-end gaming. I have installed the Quadro card (the primary GPU), in both slot 2 and slot 5, with the GTX being in the other slot, without any issues or noticable performance loss. Fortunately, the HP Z620 BIOS allows you to select which slot the primary GPU card is installed in. As you correctly pointed out, there isn't a lot of space to install a 'wide' GPU/compute card in slot 5. Therefor, I had the GTX card in slot 2 when it had the original blower cooler installed.
After I converted the card to liquid cooling, I moved the GTX card to slot 5, giving the air-cooled P2000 card plenty of room to breathe in slot 2.
P.S. Nice card modding.
09-28-2020 02:09 PM
You might find out that the BIOS screen will constantly flash on and off if you have the compute card in slot 2 and the BIOS has slot 2 selected as the primary graphics card. To be honest, I 'm not 100% sure if the BIOS option will be available on your machine since you are adding a compute card with a graphics card. In my set-up, I have 2 graphics cards, not a graphics and a compute card installed. With only 1 graphics card installed, the option is not visible in the BIOS, the option is only visible when a second graphics card is added (e.g. dual NVlinked Quadros, etc.). Check in the BIOS - Advanced / Device Options / VGA Configuration. If you see the setting, change it to slot 5.
09-28-2020 02:36 PM
Vga configuration is already set up to slot 5, but i don't understand what it means, beacuse my K2000 is on slot2.
Another question: I use Geekbench for testing and Gpu-Z to check during testing: I noticed that during test bus interface is limited to Pci-express x8 3.0. Could be an issue? it should be Pci-express x16 3.0
09-28-2020 03:22 PM
Sorry, starting to get a little confused now? The image in your post shows the K2000 card in slot 5 and the K40 in slot 2 - I assumed you had already installed the cards in these slots. If you now have the K2000 in slot 2 then swap them around so the K40 is in slot 2 and the K2000 in slot 5. Leave the BIOS setting 'as is' - do not change it.
I would recommend you give Octanebench (select version 4.00c) a try. It's a good way of confirming the GPU cards are performing as expected. You can test each GPU individually and also combined. Octanbench is pretty much a pure CUDA engine benchmark tool and is great when comparing compute/render performance with other GPU's .
09-28-2020 03:43 PM - edited 09-28-2020 03:46 PM
"I noticed that during test bus interface is limited to Pci-express x8 3.0. Could be an issue? it should be Pci-express x16 3.0"
Your K40 compute card has a PCIx16 3.0 interface, but your K2000 card only has a PCIx16 2.0 interface. Since PCI 2.0 is about half the speed of PCI 3.0 are you interpreting the results correctly? i.e. PCIx16 2.0 speed = PCIx8 3.0 speed
A PCI Express 2.0 x16 slot offers a maximum theoretical bandwidth of 8 GiB/s, while a PCI Express 3.0 x16 slot reaches 16 GiB/s.
09-28-2020 03:55 PM
It is what i read from gpu-z: k40 can go to x16 3.0, but is limited x8.
Moreover In bios setting i found a speed limit setting for pci slot: it is set to auto, do i have to change anything?
I will try octane as your advice