The GV-Tower NVR system comes with 4 hot swap drive bays for the storage up to 12TB. This system has two CPU options i3 and i5. The Intel Core i3 processor is based on sandy bridge architecture, while the Intel Core i5 processor is based on Ivy Bridge architecture. It features the latest upgraded NVR system and 64-bit Microsoft Windows 7. GV-Tower NVR system supports up to 32 channels of GV-IP devices or third-party IP devices (license required). Can also bring the surveillance on the HDTV with a HDMI cable. It is a towering, affordable and efficient NVR system that have ever seen.