by Davide Piumetti. How to build your own computer: a recent ( March 2012 ) step by step italian guide on assembling and building by hand your personal computer. 490 euro for a high performances system: Intel Core i5 2320, ASRock H61M/U3S3 motherboard, AMD Radeon HD 7750 graphic card, Crucial Ddr3 1.333 MHz ( 2 x 4 GB ) memory, Western Digital Caviar Blue 500GB HD.