AMD Radeon HD 7950 vs AMD Radeon HD 6870 X2

VS

AMD Radeon HD 7950

AMD Radeon HD 6870 X2

We compared two Desktop platform GPUs: 3GB VRAM Radeon HD 7950 and 1024MB VRAM Radeon HD 6870 X2 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 7950 's Advantages

Released 6 months late

More VRAM (3GB vs 1024GB)

Larger VRAM bandwidth (240.0GB/s vs 134.4GB/s)

672 additional rendering cores

Lower TDP (200W vs 300W)

Score

Benchmark

FP32 (float)

Radeon HD 7950 +42%

2.867 TFLOPS

Radeon HD 6870 X2

2.016 TFLOPS

Radeon HD 7950

VS

Radeon HD 6870 X2

Graphics Card

Jan 2012

Release Date

Jul 2011

Southern Islands

Generation

Northern Islands

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

1250 MHz

Memory Clock

1050 MHz

Memory

3GB

Memory Size

1024MB

GDDR5

Memory Type

GDDR5

384bit

Memory Bus

256bit

240.0GB/s

Bandwidth

134.4GB/s

Render Config

28

Compute Units

14

-

1792

Shading Units

1120

112

TMUs

56

32

ROPs

32

-

16 KB (per CU)

L1 Cache

8 KB (per CU)

768 KB

L2 Cache

512 KB

-

Theoretical Performance

25.60 GPixel/s

Pixel Rate

28.80 GPixel/s

89.60 GTexel/s

Texture Rate

50.40 GTexel/s

-

2.867 TFLOPS

FP32 (float)

2.016 TFLOPS

716.8 GFLOPS

FP64 (double)

-

Board Design

200W

TDP

300W

550 W

Suggested PSU

700 W

1x DVI 1x HDMI 1.4a 2x mini-DisplayPort 1.2

Outputs

2x DVI 1x HDMI 1.3a 2x mini-DisplayPort 1.1

2x 6-pin

Power Connectors

-

Graphics Processor

Tahiti

GPU Name

Barts

Tahiti PRO (215-0821056)

GPU Variant

Barts XT (215-0798000)

GCN 1.0

Architecture

TeraScale 2

TSMC

Foundry

TSMC

28 nm

Process Size

40 nm

4.313 billion

Transistors

1.7 billion

352 mm²

Die Size

255 mm²

Graphics Features

12 (11_1)

DirectX

11.2 (11_0)

4.6

OpenGL

4.4

1.2

OpenCL

1.2

Vulkan

N/A

-

5.1

Shader Model

5.0

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