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Upgrade i5 2500K to coffee lake i3-8100?

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#1 sjs1978


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Posted 04 November 2017 - 11:04 AM

I want to build a new mini iTX system to save some space (this is my primary goal), right now I have a full ATX desktop built around the i5 2500k CPU.  


Now seems like a good time, the new i3 processors look pretty good performance (compared to previous generation i3)


But do you think a system using the i3-8100 processor would be any faster than my current system?  At the very least I'd want a small amount of performance improvement.   


I would consider the i3-8350K but if I can get a reasonable performance from the 8100 I'd rather save the money.

From passmark website I found the following scores


i5-2500K    6467

i3-8100      7918

i3-8350K    9603



Any thoughts?

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#2 Drillingmachine


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Posted 04 November 2017 - 12:04 PM

Generally Passmark is poor indication of CPU performance if higher accuracy is needed. It may show big picture but rarely better. For example:


AMD Ryzen 7 PRO 1700X 15,433
AMD Ryzen 7 1700X 14,642


Ryzen 7 Pro 1700X is exactly same CPU as Ryzen 7 1700, only difference is name so performance should also be same.


Performance improvement is very small and even smaller if you overclock 2500K. I also see no valid reasons to switch 4C/4T CPU into another 4C/4T CPU. Another reason i3-8100 is not very good choice for ITX system is fact that it has no soldered heat spreader and so needs good cooling.


For those reasons (and limited upgrade path) I recommend at least Ryzen 5 1600.

#3 jonuk76


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Posted 04 November 2017 - 12:23 PM

Assuming stock speeds, some improvement in performance, but not a massive amount.  The i5-2500K is overclockable, while the i3 8100 isn't.  Here's an alternative comparison - http://cpu.userbenchmark.com/Compare/Intel-Core-i5-2500K-vs-Intel-Core-i3-8100/619vs3942


If you wanted a more definite upgrade without a big cost increase consider the 6 core i5-8400 (along with the R5 1600). It's base clock of 2.8 Ghz is pretty irrelevant - it's a 3.8 Ghz chip.


I wouldn't build a system if I didn't need one at the moment. RAM prices are the highest they've been for years (where I am, prices have tripled over the last 2 years), and video card and SSD prices are also not great.  Who knows where they go from here, but in my experience RAM prices in particular are volatile and likely to fall at some point from where they are at the moment..

Edited by jonuk76, 05 November 2017 - 04:30 AM.


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