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AMD Radeon HD 7770M

AMD Radeon HD 7770M

The AMD Radeon HD 7770M is a 28nm DirectX 11 graphics card based on the GCN (Graphics Core Next) architecture. Built primarily for large laptops, the graphics card is positioned in the performance category as of 2012.

The design of the Radeon 7700M series has its roots to the Cape Verde chip as found, for example, on the desktop Radeon HD 7750 with 512 1D shader cores and 32 texture units. However it but has a core clock of only 675 MHz versus the 800 MHz of the HD 7750.  As a result, general performance of the HD 7770M is expected to be slower than the desktop 7750 cards.

The performance should be similar to the GeForce GT 650M and GT 740M and therefore in the mid-range class.

Features of the 7770M include the new UVD3 video decoder for decoding MPEG-4 AVC/H.264, VC-1, MPEG-2, Flash and now also Multi-View Codec (MVC) and MPEG-4 part 2 (DivX, xVid) HD videos directly from the AMD GPU.

The 7700M series also supports automatic graphics switching between the integrated GPU and discrete GPU. Called Enduro, the technology supersedes AMD's Dynamic Switchable Graphics and is similar to Nvidia's Optimus. Furthermore, the 7770M can directly support up to 6 connected monitors using Eyefinity Technology if Enduro is disabled.

Other features of the 7700M series include ZeroCore for reducing power consumption when the display is turned off and Power Gating to power down areas of the chip that are not used. PowerTune allows automatic overclocking and underclocking of the graphics card as long as the GPU is within its TDP range. For example, the chip may be underclocked when running FurMark and OCCT, but will overclock in certain games like Lost Planet, Crysis or Resident Evil 5.

The integrated HD audio processor is able to transmit HD Audio (TrueHD or DTS Master Audio) over HDMI and DisplayPort (e.g., for Blu-Ray videos). Additionally, it now allows audio to output simultaneously and in parallel to multiple devices with the new Discrete Digital Multipoint Audio (DDMA) feature.

Power consumption of the 7770M should be clearly lower than the desktop 7750 which is rated at an ACP (average power) of 55 Watt. 

Radeon HD 7700M Series

Radeon HD 7770M 512 @ 0.68 GHz128 Bit @ 4000 MHz
Radeon HD 7750M compare 512 @ 0.58 GHz128 Bit @ 4000 MHz
Radeon HD 7730M compare 512 @ 0.58 - 0.68 GHz128 Bit @ 1800 MHz
CodenameChelsea XT
Pipelines512 - unified
Core Speed675 MHz
Memory Speed4000 MHz
Memory Bus Width128 Bit
Memory TypeGDDR5
Shared Memoryno
APIDirectX 11.1, Shader 5.1, OpenGL 4.1
Power Consumption32 Watt
technology28 nm
Notebook Sizemedium sized
Date of Announcement24.04.2012


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3DM Vant. Perf. total +
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Class 1

Class 2

Radeon PRO W6600M *

Class 3

UHD Graphics 32EUs
UHD Graphics 750

Class 4

Class 5

* Approximate position of the graphics adapter