Sorry I don’t understand the first part of your question. As far as the differences between the Intel® Core™ i5-2400, Intel Core i5-2500, and the Intel Core i5-2500K check below for a quick answer or see this site
http://ark.intel.com/compare/52207,52209,52210
.
Intel Core i5-2400:
-TXT (Trusted Execution Technology)
-VT-d (Virtualization with directed I/O)
-Intel HD 2000 Graphics
-3.1GHz clock speed
Intel Core i5-2500:
-TXT (Trusted Execution Technology)
-VT-d (Virtualization with directed I/O)
-Intel HD 2000 Graphics
-3.3GHz clock speed
Intel Core i5-2500K:
-Unlocked multiplier (allows the overclocking of the core clock speed)
-Intel HD 3000 Graphics (improvement over the HD 2000 graphics)
-3.3GHz clock speed but can be overclocked
Christian Wood
Intel Enthusiast Team