i dont know the specs but SLI-DR is probably a revision or the SLI-D
it appears the DR has more
SLI-DR
# 2 connectors for 4 additional external USB 2.0/1.1 ports
# 1 connector for 1 external IEEE 1394 port
# 1 connector for 1 external serial port
# 1 front audio connector for external line-out and mic-in jacks (on the Karajan audio module)
# 1 CD-in internal audio connector (on the Karajan audio module)
# 1 S/PDIF connector for optical cable connection
# 1 IR connector
# 8 Serial ATA connectors
# 2 IDE connectors
# 1 floppy connector
# 1 24-pin ATX power connector
# 1 4-pin ATX 12V power connector
# 2 4-pin 5V/12V power connectors (FDD-type and HDD type)
# 1 front panel connector
# 5 fan connectors
# 4 diagnostic LEDs
# 1 diagnostic LED connector for external 4 diagnostic LEDs display
# EZ touch switches (power switch and reset switch)
SLI-D
# 2 connectors for 4 additional external USB 2.0/1.1 ports
# 1 connector for 1 external IEEE 1394 port
# 1 connector for 1 external serial port
# 1 front audio connector for external line-out and mic-in jacks (on the Karajan audio module)
# 1 CD-in internal audio connector (on the Karajan audio module)
# 1 S/PDIF connector for optical cable connection
# 1 IR connector
# 4 Serial ATA connectors
# 2 IDE connectors
# 1 floppy connector
# 1 24-pin ATX power connector
# 1 4-pin ATX 12V power connector
# 2 4-pin 5V/12V power connectors (FDD-type and HDD type)
# 1 front panel connector
# 5 fan connectors
# 4 diagnostic LEDs
# EZ touch switches (power switch and reset switch)
the DR has more Serial ATA connectors and an extra LED for diagnostics.. thats all i see.