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2017 21″ iMac 4K (RP560) [7th,4C,K] + RX Vega 56 @ 32Gbps-TB3 (Sonnet Breakaway 550) + macOS 10.14 & Win10 [semohe] // on external ssd – External GPU Builds
Using External Thunderbolt SSD to Speed Up Mid-2011 27" iMac: Mac Talk Forum: Digital Photography Review
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