Ditto for the recent models of iMac, MacBook Pro, Mac mini with four Thunderbolt 3 ports.Īs for eGPU boxes, we used a mix: AKiTiO Node Pro (500W), Sonnet Breakaway eGFX (650W), and OWC Mercury Helios FX (650W). It's probably best to stick with just two eGPUs on the iMac Pro - one on each Thunderbolt 3 controller. (The iMac Pro has four Thunderbolt 3 ports, each pair sharing a controller.) If two GPUs using a shared controller saturate the bandwidth, the performance gain can be limited. We hesitated to add the Vega Frontier as a third eGPU box since it is forced to share a Thunderbolt 3 controller with the eGPU box connected to the adjacent Thunderbolt 3 port. But then nobody wants to invest in faster GPUs with or without eGPU boxes without knowing the benefits or lack thereof. It is a mixed bag so you must experiment. And each model of Mac reacts differently to the presence of eGPUs. Not all let you choose the active GPU(s). Not every pro app takes advantage of multiple GPUs - especially if they are external. Resolve gives you the choice of Metal and OpenCL. And they don't require additional displays to take advantage of the external GPUs. The beauty of Blender and DaVinci Resolve is that they give you full control of what GPUs will be used for rendering. We chose tests that fully stress the GPU (and that can use all available). Though the optional factory AMD Radeon Pro Vega 64 is powerful, we wanted to show how the iMac Pro can benefit from adding eGPUs with even more powerful GPUs. The GPU intensive effect is rendered on the fly using Metal during looping playback. Three Nodes of Noise Reduction was applied to the Candle Project "Parrot" clip. Rendered the BMW (bmw27_gpu.blend) demo scene using only GPU(s) redering using OpenCL. The Vega and VII GPUs were installed in eGPU Boxes and connected to the iMac Pro's Thunderbolt 3 Ports.
TEST MULE: 2017 iMac Pro 8-core 3.2GHz Xeon W-2140B, 32GB of 2666MHz DDR4 ECC memory, Internal Radeon Pro Vega 64 (16GB HBM2) GPU, 1TB PCIe-based flash storage. Vega64 + VII = Radeon Pro Vega 64 GPU + Radeon VII GPU V64 + Dual VII = Radeon Pro Vega 64 GPU + dual AMD Radeon VII GPUs V64+VegaF+Dual VII = Radeon Pro Vega 64 GPU + Radeon Vega Frontier Edition GPU+ dual AMD Radeon VII GPUs
How fast can GPU intensive apps run when all four GPUs are 'cooking'? We connected THREE eGPUs to the iMac Pro. August 16th, 2019 by rob-ART morgan, mad scientistĬorrection August 20th: Blender renders using OpenCL.
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