Okay, so is there a big difference between existing iMac and 8th gen (assuming this is what we might get)?
TL, DR - both 8th and 9th gen chips will offer substantial improvements over the current 7th gen.
Here’s a comparison chart I made from what I could find online. Geekbench scores for 9th gen are still coming in, so i’ve excluded those until we have better data. According to UserBenchmark, there is a major difference between the 7700K and 8700K, but the only major difference between 8700K and 9700K would be for gaming, which is not necessarily the iMac’s focus. Workstation (multi-thread) performance seems to be roughly the same.
7th Generation i7 7700K
4 Core // 8 Threads
Geekbench: 5696 (Single) 18812 (Multi)
CPU Benchmark: 12043
UserBenchmark: 95% (Gaming) 97% (Desktop) 71% (Workstation)
8th Generation i7 8700K
6 Core // 12 Threads
Geekbench: 5897 (Single) 25988 (Multi)
CPU Benchmark: 15974
UserBenchmark: 108% (Gaming) 105% (Desktop) 96% (Workstation)
9th Generation i7 9700K
8 Core // 8 Threads
CPU Benchmark: 17425
UserBenchmark: 114% (Gaming) 109% (Desktop) 96% (Workstation)
9th Generation i9 9900K
8 Core // 16 Threads
CPU Benchmark: 20460
UserBenchmark: 121% (Gaming) 117% (Desktop) 125% (Workstation)
4 Core // 8 Threads
Geekbench: 5696 (Single) 18812 (Multi)
CPU Benchmark: 12043
UserBenchmark: 95% (Gaming) 97% (Desktop) 71% (Workstation)
8th Generation i7 8700K
6 Core // 12 Threads
Geekbench: 5897 (Single) 25988 (Multi)
CPU Benchmark: 15974
UserBenchmark: 108% (Gaming) 105% (Desktop) 96% (Workstation)
9th Generation i7 9700K
8 Core // 8 Threads
CPU Benchmark: 17425
UserBenchmark: 114% (Gaming) 109% (Desktop) 96% (Workstation)
9th Generation i9 9900K
8 Core // 16 Threads
CPU Benchmark: 20460
UserBenchmark: 121% (Gaming) 117% (Desktop) 125% (Workstation)
It’s also important to note that real-world experiences vary greatly. There are a lot of reviews out there that say 8700K & 9700K chips are not very different since the 9700K only has 8 threads. Also thermals are important to note as well. The 7700K is a 91W chip, while the 8th and 9th gen chips are 95W. However, many users are reporting that 9th gen chips can get extremely hot when using max turbo frequency, so even though the 9900K has great results, if they do not use proper cooling in the iMac, there won’t be as much of a benefit as you would expect.
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