Intel Core i5-6400 vs Intel Core i7-7700

The Intel Core i5-6400, based on the Skylake-S architecture, was introduced as a 6th generation desktop processor and was aimed at mid-segment users looking for a solid foundation for everyday tasks and lighter applications.

The Intel Core i7-7700, on the other hand, a 7th generation processor with Kaby Lake-S architecture, targeted more demanding users who required higher performance for multitasking, content creation, and gaming.

Both processors are manufactured using Intel's 14nm fabrication process. The Intel Core i5-6400 features 4 physical cores and 4 threads. In contrast, the Intel Core i7-7700 also offers 4 physical cores but 8 threads thanks to Intel's Hyper-Threading technology, which allows for more efficient processing of multiple tasks simultaneously.

Both CPUs use PCIe Version 3.0 for connecting expansion cards. In terms of performance, the Intel Core i7-7700 demonstrates noticeably higher single-core performance compared to the Intel Core i5-6400, resulting from its higher clock frequency and slightly refined architecture. For multi-core performance, the Intel Core i7-7700 gains a significant advantage over the Intel Core i5-6400's 4 threads thanks to its 8 threads and higher clock speed, making it superior for multitasking-intensive and demanding applications.

For gaming scenarios, the Intel Core i7-7700 is also the better choice, as games benefit from its superior single-core performance and higher clock frequencies. The Intel Core i5-6400 has 6 MB, the Intel Core i7-7700 has 8 MB of Level 3 cache and a higher maximum memory bandwidth of 38 GB/s compared to 34 GB/s.

Both feature an integrated graphics unit (Intel HD Graphics 530 and Intel HD Graphics 630 respectively). Both processors typically have a Thermal Design Power (TDP) of 65 watts, indicating similar cooling requirements and comparable energy efficiency in their class. As they are older generations of desktop processors, they are primarily found on the used market.

Overall, the Intel Core i7-7700 offers significantly higher performance for demanding tasks and gaming, making it the better choice for users who need more processing power. The Intel Core i5-6400, however, represents a more solid and usually more cost-effective option for everyday tasks, office applications, and light gaming.