Trying to decide between i7-8700K and i9-7900X

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modeonoff

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Jul 16, 2017
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Hello, I am trying to decide between the two systems. They are over $1000 apart. I don't mind paying for the i9-7900X as the workstation I am going to build is for professional work related use. However, I am concerned about Meltdown and Spectre affecting its performance as my work involve intensive CPU and CUDA computations that involve PCIe. -20% drop in performance as mentioned below is a lot.

https://linustechtips.com/main/topic/882509-intel-vs-amd-post-meltdownspectre-update-for-hedt-setups-i9-or-1950x-are-both-impacted-equally-by-the-update-or-does-one-perform-better/

Anybody with more knowledge on these vulnerabilities could comment on this?

Does 8700K also suffer from such big performance lost?
 
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jaslion

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Dec 17, 2012
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Might want too look into the ryzen 2700x or even a threadripper if it's really cpu intensive and scales well among a lot of cores.
 
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Pat Flynn

Pat Flynn

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Aug 8, 2013
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Honestly, if you're in a secured office, take the Meltdown/Spectre out of the equation. The i9-7900x is going to beat the pants off the 8700K if the apps you're using can use every available thread on the CPU. Also, maybe check out benchmarks on the AMD Threadrippers to see if the vast core count on those would be even better (Tom's likely has reviews showing several benchmarks on workstation softwares).
If however the apps you're using aren't going to be vastly affected by core count, going with the 8700K and putting that money into a better Quadro card might be a better bet.

Edit- taking Meltdown/Spectre out of the equation = disable the hotfix
 
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M

modeonoff

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Jul 16, 2017
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Thanks. The most computations are done on the GPUs rather than CPU.

I try to stay away from the Threadripper systems due to some potential compatibility issues with software libraries. So, either i9-7900X now or a temporary 8700K with 1GPU until PCIe 4.0 system components come out hopefully in 1-1.5 years.
 
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