AMD’s Radeon HD 6300M and Radeon HD 6500M have been announced for a
while now. AMD has now added to the 6000M family (dropping the
“Mobility” tag for an “M” suffix) with no less than 6 different chips and 7 series.
Restricted to the 40nm process, the 6000M family is a strange mix of
re-brands from the Mobility Radeon HD 5000 series and new refreshes. The
Radeon HD 6300M, 6500M and 6800M feature the same chips as Mobility
Radeon HD 5400 (Cedar), HD 5600/5700 (Redwood) and HD 5800 (Juniper)
respectively. The new products are Radeon HD 6400M, 6600M/6700M and 6900M.

AMD’s Radeon HD 6300M and Radeon HD 6500M have been announced for a
while now. AMD has now added to the 6000M family (dropping the
“Mobility” tag for an “M” suffix) with no less than 6 different chips and 7 series.
Restricted to the 40nm process, the 6000M family is a strange mix of
re-brands from the Mobility Radeon HD 5000 series and new refreshes. The
Radeon HD 6300M, 6500M and 6800M feature the same chips as Mobility
Radeon HD 5400 (Cedar), HD 5600/5700 (Redwood) and HD 5800 (Juniper)
respectively. The new products are Radeon HD 6400M, 6600M/6700M and 6900M.

The HD 6900M series, codenamed Blackcomb, is based on Barts, the same chip powering the desktop Radeon HD 6800 series. It features upto 960 SP (thus two SIMDs disabled) over a 256-bit memory interface with a clock speed of ~675 MHz. Under the HD 6900M will be a Juniper based HD 6800M – a rebrand from HD 5800M. HD 6600M/6700M is codenamed Whistler, and is based on Turks, featuring 480SP at 725 MHz.

The final “new” product is HD 6400M, codenamed Seymour, based on Caicos. It doubles up on HD 5400M’s single SIMD, with 160SP clocked at 800 MHz. However, it retains the same 64-bit memory interface as the HD 5400M.

The old/rebrand products HD 6300M, HD 6500M and HD 6800M lack the new features in HD 6400M, HD 6700M and HD 6900M, including UVD3, Tessellation performance improvements, etc.

The HD 6400M and HD 6700M specifications also hint at what is coming in the desktop arena, in terms of replacements for AMD’s Radeon HD 5400, 5500 and 5600 series. Also, like the previous generation, the top desktop chip fails to make it to the notebook arena.

Designs featuring the HD 6000M graphics are being previewed at CES 2011. Radeon HD 6000M is hardly a big leap forward from the Mobility Radeon HD 5000 family, with confusing branding and six different chips from two different generations. However, it should bring in mild performance boosts till the GPUs finally move to 28nm.

Source: AMD Press Release