AMD Radeon RX 640 Mobile vs AMD Radeon HD 6990M Rebrand

VS

AMD Radeon RX 640 Mobile

AMD Radeon HD 6990M Rebrand

We compared two Mobile platform GPUs: 2GB VRAM Radeon RX 640 Mobile and 1024MB VRAM Radeon HD 6990M Rebrand to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon RX 640 Mobile 's Advantages

Released 7 years and 10 months late

Boost Clock1218MHz

More VRAM (2GB vs 1024GB)

Lower TDP (50W vs 100W)

AMD Radeon HD 6990M Rebrand 's Advantages

Larger VRAM bandwidth (70.40GB/s vs 48.00GB/s)

160 additional rendering cores

Score

Benchmark

FP32 (float)

Radeon RX 640 Mobile +21%

1.559 TFLOPS

Radeon HD 6990M Rebrand

1.28 TFLOPS

Radeon RX 640 Mobile

VS

Radeon HD 6990M Rebrand

Graphics Card

May 2019

Release Date

Jul 2011

Mobility Radeon

Generation

Vancouver

Mobile

Type

Mobile

PCIe 3.0 x8

Bus Interface

MXM-B (3.0)

Clock Speeds

1082 MHz

Base Clock

-

1218 MHz

Boost Clock

-

1500 MHz

Memory Clock

1100 MHz

Memory

2GB

Memory Size

1024MB

GDDR5

Memory Type

GDDR5

64bit

Memory Bus

128bit

48.00GB/s

Bandwidth

70.40GB/s

Render Config

10

Compute Units

14

-

640

Shading Units

800

40

TMUs

40

16

ROPs

16

-

16 KB (per CU)

L1 Cache

8 KB (per CU)

512 KB

L2 Cache

256 KB

-

Theoretical Performance

19.49 GPixel/s

Pixel Rate

12.80 GPixel/s

48.72 GTexel/s

Texture Rate

32.00 GTexel/s

1.559 TFLOPS

FP16 (half)

-

1.559 TFLOPS

FP32 (float)

1280 GFLOPS

97.44 GFLOPS

FP64 (double)

-

Board Design

50W

TDP

100W

-

No outputs

Outputs

No outputs

None

Power Connectors

-

Graphics Processor

Polaris 23

GPU Name

Broadway

Polaris 23 XT

GPU Variant

Broadway XTX

GCN 4.0

Architecture

TeraScale 2

GlobalFoundries

Foundry

TSMC

14 nm

Process Size

40 nm

2.2 billion

Transistors

1.04 billion

103 mm²

Die Size

166 mm²

Graphics Features

12 (12_0)

DirectX

11.2 (11_0)

4.6

OpenGL

4.4

2.1

OpenCL

1.2

Vulkan

N/A

-

6.4

Shader Model

5.0

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