AMD Radeon HD 6990M vs AMD Radeon Pro 555X

VS

AMD Radeon HD 6990M

AMD Radeon Pro 555X

We compared two Mobile platform GPUs: 2GB VRAM Radeon HD 6990M and 4GB VRAM Radeon Pro 555X to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 6990M 's Advantages

Larger VRAM bandwidth (115.2GB/s vs 94.08GB/s)

352 additional rendering cores

AMD Radeon Pro 555X 's Advantages

Released 7 years late

More VRAM (4GB vs 2GB)

Lower TDP (75W vs 100W)

Score

Benchmark

FP32 (float)

Radeon HD 6990M +15%

1.602 TFLOPS

Radeon Pro 555X

1.393 TFLOPS

Radeon HD 6990M

VS

Radeon Pro 555X

Graphics Card

Jul 2011

Release Date

Jul 2018

Vancouver

Generation

Radeon Pro Mac

Mobile

Type

Mobile

MXM-B (3.0)

Bus Interface

PCIe 3.0 x8

Clock Speeds

-

900 MHz

Memory Clock

1470 MHz

Memory

2GB

Memory Size

4GB

GDDR5

Memory Type

GDDR5

256bit

Memory Bus

128bit

115.2GB/s

Bandwidth

94.08GB/s

Render Config

14

Compute Units

12

-

1120

Shading Units

768

56

TMUs

48

32

ROPs

16

-

8 KB (per CU)

L1 Cache

16 KB (per CU)

512 KB

L2 Cache

1024 KB

-

Theoretical Performance

22.88 GPixel/s

Pixel Rate

14.51 GPixel/s

40.04 GTexel/s

Texture Rate

43.54 GTexel/s

-

FP16 (half)

1393 GFLOPS

1.602 TFLOPS

FP32 (float)

1393 GFLOPS

-

FP64 (double)

87.07 GFLOPS

Board Design

100W

TDP

75W

-

No outputs

Outputs

No outputs

None

Power Connectors

None

Graphics Processor

Blackcomb

GPU Name

Polaris 21

Blackcomb XTX (216-0811030)

GPU Variant

Polaris 21 PRO

TeraScale 2

Architecture

GCN 4.0

TSMC

Foundry

GlobalFoundries

40 nm

Process Size

14 nm

1.7 billion

Transistors

3 billion

212 mm²

Die Size

123 mm²

Graphics Features

11.2 (11_0)

DirectX

12 (12_0)

4.4

OpenGL

4.6

1.2

OpenCL

2.1

N/A

Vulkan

1.2

-

5.0

Shader Model

6.4

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