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Intel Core i3 8121U vs Core i5 8400

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Specification Charts

Combined Speed (all threads combined)

Core i5 8400 16.8 GT/s
Core i3 8121U 8.8 GT/s
Difference: 8 (91%)

Core Speed

Core i5 8400 2.8 GHz
Core i3 8121U 2.2 GHz
Difference: 0.6 (27%)

Threads

Core i5 8400 6
Core i3 8121U 4
Difference: 2 (50%)

TDP

Core i5 8400 65 Watts
Core i3 8121U 15 Watts
Difference: 50 (333%)

Price Comparison

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Core i3 8121U

Amazon.com

Core i5 8400

Amazon.com

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model Core i3 8121U Core i5 8400
Manufacturer Intel Intel
Architecture Cannon Lake Coffee Lake
Core Speed 2.2 GHz 2.8 GHz
Hyperthreading Yes No
Cores / Modules 2 6
Total Threads 4 6
Turbo 3.2 GHz 4 GHz
L2 Cache
L3 Cache 4MB 9MB
GPU Model UHD 630
TDP 15 Watts 65 Watts
Socket LGA 1151
Released 2018 August 2017
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Core i3 8121U

Amazon.com

Core i5 8400

Amazon.com

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.