The Radeon HD 3400 series includes the HD 3450 and the HD 3470, they both have a core clock of 800MHz and have 40 stream processors.
The HD 3450 will have 256MB of DDR2 500MHz memory and the HD 3470 will have 256MB of GDDR3 950MHz memory both of them with 64-bit memory interfaces. The HD Radeon 3400 series will be priced between $49 and $65.
The new mainstream graphics card is the Radeon HD 3650 with 120 stream processors. The HD 3650 will have two variations, the first with 256MB of GDDR3 800MHz memory and the second will feature 3 tiers of 500MHz DDR2 memory at 256MB, 512MB, and 1GB all of which will have a 128-bit memory interface. All of the HD 3650 cards will be clocked at 725MHz and will not support hybrid corssfire. The HD 3650 will be priced between $79 and $99.
AMD/ATI also announced immediate availability of the new high end Radeon HD 3870 X2 graphics card. This is the first graphics processor to break the Teraflop processing barrier. The HD 3870 X2 combines two Radeon HD 3870s on a single graphics board connected through integrated CrossFire technology. The new graphics card will be priced at $449, which is a fairly good deal considering the recent high end cards being priced at nearly $700 from Nvidia.