Replace the 3TB spinning HDD with the largest SATA drive that will physically fit inside the case (hopefully a 12 or 16TB drive - I need lots of storage).Replace the 128GB SSD with a 1 or 2TB SSD.I want to buy the high-end model iMac with the fusion drive and make the following upgrades: But imagine what Apple could do if it didn't insist on cramming fast new parts into a thin, stuffy cabinet.My old workhorse 17' MacBook Pro (circa 2011) finally gave up the ghost after 8 years of reliable service (may it rest in peace), and I'm looking into a 27' iMac to replace it. I'm not saying Apple should turn the iMac into a big, roomy system. To Apple's credit, while the air blowing out the back vent got hot - about 105 degrees Farenheit - the surrounding metal never did. the iMac at the 4.2GHz Turbo Boost max, which requires more power and cooling than the iMac can pull: The CPU package was drawing a sustained 119 watts at 64 degrees Celsius, compared with the iMac's hovering around 85 watts but running at 93 C. That reflects the overclocked system running at a steady 4.97GHz vs.

(The results for OpenCL were almost identical.) And in my own Lightroom test, an almost exclusively CPU-bottlenecking import of 42-megapixel Sony A7R2 raw files with 1:1 preview generation which maxes out all the cores, the Millennium took 25 minutes to the iMac's 30. And since Apple deprecated OpenGL, it's not a surprise that Nvidia RTX 2080 Ti-based Windows systems outperform it on the OpenGL test.īut in a quick-and-dirty test using the newer version of Cinebench (R20), which is theoretically better balanced, the iMac Pro got 4,272cb compared to the Millenium's 5,054cb on the Metal test. I wouldn't be surprised if the gap between the iMac 27 and iMac Pro we tested narrowed significantly if the 27 had 64GB RAM instead of 16GB. Keep in mind that benchmarks tend to be sensitive to the speed and amount of memory in a system.

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