... adapter, dvr adapter,usb dvr adapter,dvr card,4 channels usb dvr,security dvr cardCharacteristicSize is ... Audio ADC, does not need record by sound card; Lower noise, Anti-interleaving display and eliminate ... : 128MB or above (Recommend 256MB DDR or above)5. Graphics: PCI/AGP bus with 16MB graphic memory or ... 8.0 or above6. Audio: Full-duplex sound card or integrated chips on mainboard7. Hard Disk: ...