In addition to the HD 3870 X2 card, Diamond has also announced its HD 3650 and HD 3450 Series. The HD 3650 from Diamond will be available with either 512MB or 1GB of DDR2 memory, while the HD 3450 will be available with 512MB of DDR2 memory.
The HD 3650 Series core works at 725MHz, while either the 1024MB or 512MB of DDR2 memory will be clocked at 800MHz. The HD 3450 core works at 600MHz and it will be available with 512MB of DDR2 memory clocked at 500MHz. The HD 3650 is a full size PCB card, while the HD 3450 is a low-profile solution and both cards will end up with active cooling.
These two cards aren't yet listed, but we expect them to show up soon.