The "e5300" likely refers to an Intel Core i5-5300 CPU, which is part of the Intel Broadwell microarchitecture family. It was released in 2014 and is a dual-core, quad-thread CPU with a base clock speed of 3.2 GHz and a maximum Turbo Boost speed of 3.6 GHz. The i5-5300 has a 6 MB L3 cache and is compatible with Intel's Z97 and H97 chipsets.
This CPU is generally suitable for everyday tasks, light gaming, and some video editing or other multi-threaded applications. It is not as powerful as more recent Intel processors, but it can still be a decent choice for budget builds or upgrades for older systems.