What's the advantage of hardware compression card?

Outstanding Stability: Hardware Compression DVR System is more stable than Software Compression DVR system due to the low cost of system CPU and RAM resources.
Record Video and Audio Simultaneously: Hardware compression Card records video and audio synchronously but software compression board can't.
More Beautiful Color Image: Hardware Compression Card usually uses high performance DSP chipset.
Fast Network Access: Due to the low cost of system resources, Hardware Compression System has better performance in network connection. Particularly shown as fast transmit speed and up to 25 channels connection simultaneously.
Up to 64 channels in one PC: Hardware compression system can support more than 64 channels in one PC with real time monitoring and real time recording. (Every channel is 25fps in PAL or 30fps in NTSC). Meanwhile most software compression system supports only 16 channels.