We have some HP G4 Z4 Core i9 7900X workstations. These are fine since they allow compact dual slot dual gpu setup plus additional pcie 8x slot for special purpose hardware. We require this for some demo setups.
Equipped them with 2x slim RTX 2080 Ti from Gigabyte plus Quadro RTX HB nvlink bridge. Buying Quadro RTX is not necessary and quite price intensive since Geforce fulfils our requirements.
Both Geforce RTX are X16 PCIEv3 connected and individuially work fine with CUDA.
System is certified by HP for Quadro SLI, but it is not mentioned that Geforce would not work… Geforce SLI cannot be enabled / does not show up in the NVIDIA Control panel.
Additionally there comes the missing P2P over PCIE on RTX cards into place which is only available with NVLINK!!! But since NVlink cannot be activated, xfer between the cards is incedibly slow.
With nvidia-smi the links are shown as enabled and even SLI capable - see info below.
So I thinke there is no technical reason refusing this option. Is there any beta driver or tweak available just to enable this upon our own risk?
Thanks, in hope of a solution,
Enrico
C:\Program Files\NVIDIA Corporation\NVSMI>nvidia-smi.exe nvlink -s
GPU 0: GeForce RTX 2080 Ti (UUID: GPU-e91516bc-6040-c0fd-e07e-50a1b08f12fd)
Link 0: 25.781 GB/s
Link 1: 25.781 GB/s
GPU 1: GeForce RTX 2080 Ti (UUID: GPU-6396582e-aeb1-a471-068c-07d510b519be)
Link 0: 25.781 GB/s
Link 1: 25.781 GB/s
C:\Program Files\NVIDIA Corporation\NVSMI>nvidia-smi.exe nvlink -c
GPU 0: GeForce RTX 2080 Ti (UUID: GPU-e91516bc-6040-c0fd-e07e-50a1b08f12fd)
Link 0, P2P is supported: true
Link 0, Access to system memory supported: true
Link 0, P2P atomics supported: true
Link 0, System memory atomics supported: true
Link 0, SLI is supported: true
Link 0, Link is supported: false
Link 1, P2P is supported: true
Link 1, Access to system memory supported: true
Link 1, P2P atomics supported: true
Link 1, System memory atomics supported: true
Link 1, SLI is supported: true
Link 1, Link is supported: false
GPU 1: GeForce RTX 2080 Ti (UUID: GPU-6396582e-aeb1-a471-068c-07d510b519be)
Link 0, P2P is supported: true
Link 0, Access to system memory supported: true
Link 0, P2P atomics supported: true
Link 0, System memory atomics supported: true
Link 0, SLI is supported: true
Link 0, Link is supported: false
Link 1, P2P is supported: true
Link 1, Access to system memory supported: true
Link 1, P2P atomics supported: true
Link 1, System memory atomics supported: true
Link 1, SLI is supported: true
Link 1, Link is supported: false