If it shows 12 instead of 16 I would guess the kit is 4x4 gb. Try to remove the ram to find the faulty one and then run memtest on that one if you boot, if it fails rma it.
| Chassi: Phantom Fulltower White Edition | Mobo: Maximus V Extreme | CPU: i7 3770k
| Memory: 2x8gb G.Skill Trident X 2400mhz | GPU: PNY Geforce GTX 670 | PSU: NZXT Hale 90 750w
| SSD: Intel 120gb 330 series (OS) | Intel 120gb 330 series (Games n stuff)
| Monitor: LG 29EA93 | Cooling: Custom Loop