StarTech.com 4 Port Triple Monitor DVI USB KVM Switch with Audio & USB 2.0 Hub - Multi Monitor KVM - USB DVI KVM Switch (SV431TDVIUA) - KVM / audio / USB switch - 4 x KVM / audio / USB - 1 local user - desktop - for P/N: SV431RACK, SVA12M2NEUA, SVA12M5NA

Switch between four triple head computers, while sharing three DVI displays, speakers & mic, USB Keyboard/Mouse, and USB 2.0 peripherals. The SV431TDVIUA 4-Port Triple Monitor DVI USB KVM Switch allows 4 PCs (each with 3 DVI video outputs) to share monitors, 1 microphone and set of speakers, 1 keyboard and 1 mouse, as well as an additional USB 2.0 peripheral such as an external hard drive, thumb drive, printer, or webcam.
The Triple DVI KVM switch enables you to switch back and forth between 4 multi DVI PCs at the touch of a button, while maintaining professional-level video quality on all monitors at resolutions up to 1920x1200. The triple DVI KVM switch also features an integrated USB hub port which allows USB 2.0 peripherals to be shared between attached systems, eliminating duplicate peripheral costs and offering the convenience of sharing stored data between PCs.
While the DVI connector on this KVM is DVI-I, the KVM only supports single-link DVI-D (digital only) video sources. It is recommended wherever possible to use DVI-D cables across all PC to KVM and KVM to console connections.
If you'd like to mount this KVM switch to your server rack, StarTech.com offers a 1U Rackmount Bracket (sold separately) that turns this KVM into a rackmountable KVM.

Switch between four triple head computers, while sharing three DVI displays, speakers & mic, USB Keyboard/Mouse, and USB 2.0 peripherals. The SV431TDVIUA 4-Port Triple Monitor DVI USB KVM Switch allows 4 PCs (each with 3 DVI video outputs) to share monitors, 1 microphone and set of speakers, 1 keyboard and 1 mouse, as well as an additional USB 2.0 peripheral such as an external hard drive, thumb drive, printer, or webcam.