AMD Radeon HD 6850 X2 vs AMD Radeon HD 7870 XT

VS

AMD Radeon HD 6850 X2

AMD Radeon HD 7870 XT

We compared two Desktop platform GPUs: 2GB VRAM Radeon HD 6850 X2 and 2GB VRAM Radeon HD 7870 XT to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 7870 XT 's Advantages

Released 1 years and 2 months late

Boost Clock975MHz

Larger VRAM bandwidth (192.0GB/s vs 134.4GB/s)

576 additional rendering cores

Lower TDP (185W vs 254W)

Score

Benchmark

FP32 (float)

Radeon HD 6850 X2

1.536 TFLOPS

Radeon HD 7870 XT +94%

2.995 TFLOPS

Radeon HD 6850 X2

VS

Radeon HD 7870 XT

Graphics Card

Sep 2011

Release Date

Nov 2012

Northern Islands

Generation

Southern Islands

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

Base Clock

925 MHz

-

Boost Clock

975 MHz

1050 MHz

Memory Clock

1500 MHz

Memory

2GB

Memory Size

2GB

GDDR5

Memory Type

GDDR5

256bit

Memory Bus

256bit

134.4GB/s

Bandwidth

192.0GB/s

Render Config

12

Compute Units

24

-

960

Shading Units

1536

48

TMUs

96

32

ROPs

32

-

8 KB (per CU)

L1 Cache

16 KB (per CU)

512 KB

L2 Cache

512 KB

-

Theoretical Performance

25.60 GPixel/s

Pixel Rate

31.20 GPixel/s

38.40 GTexel/s

Texture Rate

93.60 GTexel/s

-

1.536 TFLOPS

FP32 (float)

2.995 TFLOPS

-

FP64 (double)

748.8 GFLOPS

Board Design

254W

TDP

185W

600 W

Suggested PSU

450 W

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

Outputs

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

2x 8-pin

Power Connectors

2x 6-pin

Graphics Processor

Barts

GPU Name

Tahiti

Barts PRO (215-0798006)

GPU Variant

Tahiti LE (215-0821122)

TeraScale 2

Architecture

GCN 1.0

TSMC

Foundry

TSMC

40 nm

Process Size

28 nm

1.7 billion

Transistors

4.313 billion

255 mm²

Die Size

352 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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