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  1. 7-Jan-2015 Tech Inferno Fan>> originally it was thought that this configuration would provide 32Gbps of performance. Unfortunately that is not the case due to the Thunderbolt chip being hosted off a x4 2.0 bus, limiting performance to 16Gbps as noted. I'm excited to unveil the first ever (to my knowledge) eGPU SLI configuration. 2x 780 Ti's + 2x Sonnet SEL's running on a 2013 MacBook Pro. This was thought to be impossible, in fact Nando and I were certain it was a lost cause, but I was determined to prove otherwise. Thousands of dollars and months later, it happened.There are a number of factors that went into making this possible. The combination of hardware is the most important. The other key ingredients include software and a particular boot process that until discovered almost put an end to the whole project. As much as I would enjoy keeping this information to myself, I will happily disclose everything I know for any other lunatics out there that want to create the ultimate eGPU solution.Configuration:2013 13" MacBook Pro (15" preferred) *Iris-only graphics required!2x EVGA 780 Ti (Any matching EVGA GTX cards should work)2x Sonnet SELCorsair RM450 PSU w/2x 8pin to 8+6pinWindows 8.1External display (Optimus is not an option with SLI)*Secret step for SLI (revealed below)*Secret boot process (revealed below) – Performance Results – 3DMark 11SLI Graphics score: 22095 linkSingle 780Ti score: 125763DMark - Fire StrikeSLI Graphics score: 19395 linkSingle 780Ti score: 104103DMark06*Older benchmarks would not run with both GPUsGamesAlmost every game experienced CPU bottleneck on the 13" MBPThe above benchmarks provided static rendering and thus realistic SLI results*Please do not request benchmarks on specific games, I do nothave a 15" Iris-only MBP to give you a legitimate GPU-centric result,however, just like the benchmarks, I'm confident the results would be impressiveCUDA-Z Bandwidth (TB Device 1 and 2)Host to Device: ~1250 MiB/sDevice to Host: ~1360 MiB/sDevice to Device: ~135 GiB/s– The Secret Sauce –1. HyperSLI 1.0 (installation is simple, adds a boot option)2. Boot process:- Shutdown (not a restart)- Unplug TB cables- Wait 10 seconds- Plug in TB cable #1- Wait 10 seconds- Boot Mac and hold alt- Wait 5-10 seconds- Plug in TB cable #2- Select Windows and choose HyperSLI boot option- Should work! Open Nvidia Control Panel and enable SLI– Limitations –- CPU. 15" w/maximum quad-core CPU will provide the best SLI performance- Games that require more CPU will experience capped FPS quickly- GPUs in SLI crunch massive amounts of data @32Gbps and low-spec CPUs will not keep up- MBPs w/Iris-only graphics is required. MBP w/discrete GPU + 2 eGPUs will not boot or will result in a Code 12- External display required- Optimus is not an option. Believe me, I tried
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