Hardware Selection Advice: Difference between revisions
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===Multiple GPUs===
TUFLOW can use multiple GPU cards on a machine to run a single model (TUFLOW FV can currently use a single GPU only). This is useful for models that are too large for a single GPU, or for running a model as quickly as possible. In general terms the run time benefit of using multiple cards increases with model size.
* TUFLOW HPC-GPU does not support SLI for inter-GPU communications. It does (as of build 2020-01-AA) auto detect and utilise peer-to-peer access over NVLink or PCI bus on the motherboard. Note that not all GPUs support peer-to-peer access. In such case, or if peer-to-peer link is not present, multiple GPU cards will be automatically communicating through motherboard.
* When using multiple GPUs it is best to use cards of similar memory and performance. While it is possible (as of build 2020-01-AA) to re-balance a model over multiple GPUs, we do not recommend using cards with vastly disparate performance.
* Sufficient cooling and power supply should be considered if multiple cards are used. When installed in adjacent PCI slots, the preference is to use rear vented cards rather than side vented to avoid blowing hot air onto the neighbouring cards (which could lead to overheating).
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