AMD Radeon HD 6990M vs AMD Radeon HD 7770M

VS

AMD Radeon HD 6990M

AMD Radeon HD 7770M

We compared two Mobile platform GPUs: 2GB VRAM Radeon HD 6990M and 1024MB VRAM Radeon HD 7770M to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 6990M 's Advantages

More VRAM (2GB vs 1024GB)

Larger VRAM bandwidth (115.2GB/s vs 64.00GB/s)

608 additional rendering cores

AMD Radeon HD 7770M 's Advantages

Released 9 months late

Lower TDP (32W vs 100W)

Score

Benchmark

FP32 (float)

Radeon HD 6990M +131%

1.602 TFLOPS

Radeon HD 7770M

0.691 TFLOPS

Radeon HD 6990M

VS

Radeon HD 7770M

Graphics Card

Jul 2011

Release Date

Apr 2012

Vancouver

Generation

London

Mobile

Type

Mobile

MXM-B (3.0)

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

900 MHz

Memory Clock

1000 MHz

Memory

2GB

Memory Size

1024MB

GDDR5

Memory Type

GDDR5

256bit

Memory Bus

128bit

115.2GB/s

Bandwidth

64.00GB/s

Render Config

14

Compute Units

8

-

1120

Shading Units

512

56

TMUs

32

ROPs

16

-

8 KB (per CU)

L1 Cache

16 KB (per CU)

512 KB

L2 Cache

256 KB

-

Theoretical Performance

22.88 GPixel/s

Pixel Rate

10.80 GPixel/s

40.04 GTexel/s

Texture Rate

21.60 GTexel/s

-

1.602 TFLOPS

FP32 (float)

691.2 GFLOPS

-

FP64 (double)

43.20 GFLOPS

Board Design

100W

TDP

32W

-

No outputs

Outputs

No outputs

None

Power Connectors

-

Graphics Processor

Blackcomb

GPU Name

Chelsea

Blackcomb XTX (216-0811030)

GPU Variant

Chelsea XT

TeraScale 2

Architecture

GCN 1.0

TSMC

Foundry

TSMC

40 nm

Process Size

28 nm

1.7 billion

Transistors

1.5 billion

212 mm²

Die Size

123 mm²

Graphics Features

11.2 (11_0)

DirectX

12 (11_1)

4.4

OpenGL

4.6

1.2

OpenCL

1.2

N/A

Vulkan

1.2

-

5.0

Shader Model

5.1

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