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Intel Core i5 10400 vs Intel Core i3 2100 Legacy Series
The Intel Core i5-10400 and the Intel Core i3 2100 are merely passable for their respective price points and don't stand out from their competition in any meaningful way. We recommend that you take a look at some other CPUs that cost around $180.
However, if you're still interested in learning more about these two options, we wrote a short summary of what we know about them:
Windows Central, a review site with a history of doing objective hands-on testing, has great things to say about the Intel Core i5-10400. In fact, it's "Great For Productivity" in its "Best Processor (CPU) for Your Custom PC in 2021" roundup, which points toward it being a good CPU.
As for the Intel Core i3 2100 - Techradar, a source that conducts reliable hands-on testing, has featured it in its Intel Core i3 2100 review roundup. However, it didn't make it to any of the top spots.
We tried doing a direct Intel Core i5-10400 vs. Intel Core i3 2100 review score comparison but couldn't find any sources that tested both.
Next, we took a look at which sources liked them best and found that the Intel Core i5-10400 most impressed the reviewers at PCmag, who gave it a score of 7, whereas the Intel Core i3 2100 did best in its Techradar review - it scored 6 points.