Amfeltec GPU Rig rendering slow - normal?

[kopperdrake]

Hi all,

I'm using 4.04 LightWave plugin and have just jumped from two 1080 Ti to three. I have also bought an Amfeltec Multi GPU Cluster to house the excess cards, but I am finding that any card installed on the Cluster is running about 50% slower than an internal card. A scene that an internal card will render at 72s is taking 104s on a card on the Cluster.

Is this normal? Thanks for any advice!

[Lewis]

Could be problem of splitting PCI-E slots speed so GPUs on that cluster work on 1x-2x PCI-E speed on MB since all 4 share single PCI-E slot.

[glimpse]

Cluster has PCIe gen2 x1 host card, so that's where the hit comes from. However it should not be 50%. Could You give us more details on Your build?

[kopperdrake]

Thanks guys.

PC:

Asus X299 motherboard, i9-7940X, 64Gb, Windows 10 64-bit

2 x EVGA GTX 1080 Ti Founders Edition
1 x EVGA GTX 1080 Ti icx

PCIe Cluster rev 1.2 (2015)

What else do you need to know?