AMD Radeon Pro 555X vs AMD Radeon HD 6990M

VS

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

Main Differences

AMD Radeon Pro 555X 's Advantages

Released 7 years late

More VRAM (4GB vs 2GB)

Lower TDP (75W vs 100W)

AMD Radeon HD 6990M 's Advantages

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

352 additional rendering cores

Score

Benchmark

FP32 (float)

Radeon Pro 555X

1.393 TFLOPS

Radeon HD 6990M +15%

1.602 TFLOPS

Radeon Pro 555X

VS

Radeon HD 6990M

Graphics Card

Jul 2018

Release Date

Jul 2011

Radeon Pro Mac

Generation

Vancouver

Mobile

Type

Mobile

PCIe 3.0 x8

Bus Interface

MXM-B (3.0)

Clock Speeds

-

Base Clock

-

Boost Clock

-

1470 MHz

Memory Clock

900 MHz

Memory

4GB

Memory Size

2GB

GDDR5

Memory Type

GDDR5

128bit

Memory Bus

256bit

94.08GB/s

Bandwidth

115.2GB/s

Render Config

-

SM Count

-

12

Compute Units

14

768

Shading Units

1120

48

TMUs

56

16

ROPs

32

-

Tensor Cores

-

RT Cores

-

16 KB (per CU)

L1 Cache

8 KB (per CU)

1024 KB

L2 Cache

512 KB

Theoretical Performance

14.51 GPixel/s

Pixel Rate

22.88 GPixel/s

43.54 GTexel/s

Texture Rate

40.04 GTexel/s

1393 GFLOPS

FP16 (half)

-

1393 GFLOPS

FP32 (float)

1.602 TFLOPS

87.07 GFLOPS

FP64 (double)

-

Graphics Processor

Polaris 21

GPU Name

Blackcomb

Polaris 21 PRO

GPU Variant

Blackcomb XTX (216-0811030)

GCN 4.0

Architecture

TeraScale 2

GlobalFoundries

Foundry

TSMC

14 nm

Process Size

40 nm

3 billion

Transistors

1.7 billion

123 mm²

Die Size

212 mm²

Board Design

75W

TDP

100W

-

Suggested PSU

-

No outputs

Outputs

No outputs

None

Power Connectors

None

Graphics Features

12 (12_0)

DirectX

11.2 (11_0)

4.6

OpenGL

4.4

2.1

OpenCL

1.2

Vulkan

N/A

-

CUDA

-

6.4

Shader Model

5.0

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