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Dual Xeon E56XX, E-5 2XXX or I7 CPU (with or without Intel QuickSync)
One or two CPU depending , depending on the number of concurrent channels/encoders.
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With GPU acceleration, up to 6 channels of 1080i HD H.264, or 8 channels of SD H.264 capture is are available.
DISK
Video disk should be a physically separate disk than the system disk. More separate video disks will have better I/O performance. For multiple channels of high bitrate HD capture, SAS/SSD drives or a RAID set of enterprise SATA/nSAS drives must be used. Alternatively, each channel can be captured to a different physical drive.
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