I build my current desktop pc in 2012. It’s pretty old but still efficient. Only things that I have updated are graphic cards and SSDs. I mainly use my desktop computer but when I’m traveling I use 13″ MacBook Pro (mid 2014).

My computer’s specifications:
Operating System: Windows 7 Ultimate 64-bit
CPU: Intel i7 3930K @ 3.20 GHz Sandy Bridge-E 32nm
RAM: 32,0 DDR3 @ 1333 MHz
MOBO: Asus P9X79 Deluxe LGA2011
GPU: 2x Nvidia GeForce GTX 980
Storage: 2x Samsung 850 EVO 518GB SSD, 14TB Sata III HDD
PSU: Corsair AX850 – 80 Plus Gold
Case: Cooler Master Cosmos 1000
Fan: Noctua NH-D14

Other stuff on my table:
Sound Card: RME Babyface Pro
DAC: Cambridge Audio DacMagic Plus
Microphone: Shure SM7B
Headphones: Sony MDR-7506
Speakers: Genelec G Ones
Display: 2x Dell UltraSharp U2711
Pen Tablet: Wacom Intuos 3 Medium
Mouse: Logitech G900
Keyboard: Logitech K800