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HP Recommended

Set the K40 pci slot speed to gen3 in the BIOS.

 

P.S. What CPU and RAM do you have installed?

HP Z620 - Liquid Cooled E5-1680v2 @4.7GHz / 64GB Hynix PC3-14900R 1866MHz / GTX1080Ti FE 11GB / Quadro P2000 5GB / Samsung 256GB PCIe M.2 256GB AHCI / Passmark 9.0 Rating = 7147 / CPU 17461 / 2D 1019 / 3D 14464 / Mem 3153 / Disk 15451 / Single Threaded 2551
HP Recommended

I don't know how to set speed to gen3: the only options i found as said before is speed "limit" and I think it works in opposite way, limiting max speed. My cpu is e5 2667v2 but ram is ddr 1600.

HP Recommended

In the BIOS  - Limit PCIe Speed section, there is a drop down setting for Gen1, 2, 3 or Auto for each PCIe slot.

slot setting.JPG

HP Z620 - Liquid Cooled E5-1680v2 @4.7GHz / 64GB Hynix PC3-14900R 1866MHz / GTX1080Ti FE 11GB / Quadro P2000 5GB / Samsung 256GB PCIe M.2 256GB AHCI / Passmark 9.0 Rating = 7147 / CPU 17461 / 2D 1019 / 3D 14464 / Mem 3153 / Disk 15451 / Single Threaded 2551
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