The Intel Core i5-14400 wins in 9 out of 14 comparable specs, with 2 ties. Its biggest advantage is L2 Cache (533% better).
Core i5-8400 wins in 3 specs (Max Turbo Power: 56% better).
Recommendation
Choose Core i5-14400 if you want the best overall performance — especially l2 cache.
Choose Core i5-8400 if max turbo power matters more to you.
AI Versus Verdict
The Intel Core i5-14400 is the objective winner of this comparison, securing victories in nine out of fourteen measured specifications. Its most significant technical advantage is the L2 cache, which is 533% larger than that of the competing processor. This substantial increase in cache capacity provides the Intel Core i5-14400 with a clear architectural lead over the Intel Core i5-8400, which only outperformed its successor in three specific categories during the evaluation.
Users prioritizing modern architectural efficiency and the benefits of a significantly larger L2 cache should select the Intel Core i5-14400 for their build. Conversely, the Intel Core i5-8400 remains a viable option for those who specifically require a lower Max Turbo Power, as it holds a 56% advantage in that metric. Choosing between these two components depends entirely on whether your workload demands the expanded cache capacity of the newer model or the power profile of the older unit.
Generated by Gemini from the objective spec comparison above. AI advice is a summary, not a benchmark — always verify critical purchases.
