Mini PC FMP05B-i7-4558U was very hot sale in 2015, but as CPU too old, now no supply for long, hystou now using i7-5550U to replace it, model name FMP05B-i7-5550U.
Core i7-5550u processor was released in January, 2015 while core i7-4558U was released in July 2013. Specification for this CPU can be checked clearly from Intel directly: https://ark.intel.com/products/84992/Intel-Core-i7-5550U-Processor-4M-Cache-up-to-3_00-GHz
Below is comparation for the above two i7 cpu made by CPUboss, we can definitely find out i7-5550u is much better than i7-4558U, to get this i7-5550U fanless mini pc pls go to this link: https://www.topminipc.com/fanless-mini-pc-i7-5550
Here is some pictures for FMP05B-i7-5550U mini pc: