Core i5-10400 vs Core i5-12400

The short answer

On paper, the Core i5-12400 is the stronger processor, ahead of the Core i5-10400 in 5 of the specs we compare (the Core i5-10400 leads in 0).

• The Core i5-12400 is 2 generations newer (12th gen, launched Q1'22) than the Core i5-10400 (10th gen, Q2'20). The newer chip uses a newer core design that generally gets more work done per clock, so clock speeds alone understate the gap.
• Both have 6 cores and 12 threads.
• The Core i5-12400 reaches 4.40 GHz with turbo, 2% higher than the Core i5-10400's 4.30 GHz. Higher clocks help games and everyday apps that lean on a few fast cores.
• The Core i5-12400 has 18 MB of cache versus 12 MB.
• They use different sockets (FCLGA1200 vs FCLGA1700), so each needs its own motherboard: you can't swap one into the other's board.
• The Core i5-12400 supports DDR5 as well as DDR4 memory (depending on the motherboard); the Core i5-10400 is limited to DDR4.

This verdict is generated from official specifications only. We haven't benchmarked these processors, so it doesn't measure real-world speed in games or apps; check independent benchmarks for your specific use.