HD 4830 will be launched on Oct 23, but several companies have already shown off the mid-range cards. The GPU is RV770LE, utilizing 640 shader processors, memory interface is 256bit. Because AMD will only supply chips to AIB partners, we can expect no reference cards on sale,  and different brands will have their different PCB designs.

Yeston HD 4830 (Palit)

Core clock: 575MHz

Memory clock: 900MHz

Memory module: K4J52324QE-BJ1A Samsung 1.0ns GDDR3

VRM: 3 phase VRM for GPU, 1 Phase for memory

Connectivity: 2xDVI + HDMI

Price: <150USD

PowerColor HD 4830

Core clock: 575MHz

Memory clock: 900MHz

VRM: 2 phase VRM for GPU, 1 Phase for memory

Connectivity: DVI + HDMI + D-sub

Price: 899RMB (132USD)

Pic via PCDVD

MSI HD 4830

Core clock: 575MHz

Memory clock: 900MHz

VRM: 4 phase VRM for GPU, 1 Phase for memory

Connectivity: 2xDVI + HDTV

Price: <150USD

Via VR-Zone