AMD introduces new mobile GCN-based Radeon HD 7700M, 7800M and 7900M GPUs

By Abhinav Lal | Updated 24 Apr 2012
AMD introduces new mobile GCN-based Radeon HD 7700M, 7800M and 7900M GPUs

AMD has announced the latest additions to the AMD Radeon HD 7xxx series of graphics cards, with three new mobile GPU series, the Radeon 7700M, 7800M, and 7900M.

So far, apart from the Radeon HD 7970 in December, AMD has already shown off other Southern Islands GPUs, with what some are calling paper-launches – HD 7750 and HD 7770 in February, the Radeon HD 7870 and HD 7850 in March – as well as three other mobile graphics cards, the Radeon HD 7400M, 7500M, and HD 7600M series, in back in September last year, though these didn’t strictly follow the new Southern Islands architecture.

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The AMD Radeon 7700M, 7800M, and 7900M however, featuring the company’s new Graphics Core Next architecture. The top-of-the-line mobile GPU, the Radeon HD 7970M, is based on a Pitcairn core, and is best compared with Nvidia’s GeForce GTX 675M offering, while the HD 7870M is best compared to the GTX 560M. AMD has provided its own benchmarks the performance difference below, though of course, they must be taken with a pinch of salt.

vs. GTX 560M
vs. GTX 675M
vs. 6990M

Two of the three new series introduced, the HD 7800M and HD 7900M, support native PCIe 3.0, based on the Cape Verde die. The HD 7700M series however, has sacrificed the feature – it will probably not be missed anyway, with the bandwidth the card is given (check out specifications below).

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With the Graphics Core Next architecture making it to AMD’s mobile graphics platform (which brought ZeroCore technology, DX11.1 support, AMD Video Codec Engine, Unified Video Decoder 3.0, Steady Video 2.0, and power gating), the company has added new technologies like AMD App Acceleration (which we’ve seen in many forms before), and AMD Enduro technology.

AMD Enduro is the company’s latest attempt at dynamic switchable graphics technology, competing with Nvidia Optimus. PowerTune technology has also been added, first introduced on the HD 6970, which uses a hardware chip to control power consumption and heat, keeping in mind work load and environmental factors, to ensure the GPU doesn’t burn out, or over reach its power consumption.

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Model

Radeon HD 7900M

Radeon HD 7800M

Radeon HD 7700M

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Core Name

Wimbledon
Heathrow
Chelsea

Stream Processors

1280
640
512

Texture Units

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80
40
32
ROPs
32
16
16
Z/Stencil
128
64
64

L2 Cache

512KB
512KB
512KB

Core Clock

850MHz
800MHz
675MHz

Memory Clock

4.8GHz
4.0GHz
4.0GHz

Memory Type

2GB GDDR5

2GB GDDR5

2GB GDDR5

Memory Bus Width

256-bit
128-bit
128-bit

Memory Bandwidth

153.6 GB/s

64 GB/s

64 GB/s

PCI Express

3
3
2.1
Abhinav Lal
https://plus.google.com/u/0/118371002657670425415/posts
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