AMD Radeon HD 7870 XT vs AMD Radeon HD 6870 X2

VS

AMD Radeon HD 7870 XT

AMD Radeon HD 6870 X2

We compared two Desktop platform GPUs: 2GB VRAM Radeon HD 7870 XT 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 7870 XT 's Advantages

Released 1 years and 4 months late

Boost Clock975MHz

More VRAM (2GB vs 1024GB)

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

416 additional rendering cores

Lower TDP (185W vs 300W)

Score

Benchmark

FP32 (float)

Radeon HD 7870 XT +48%

2.995 TFLOPS

Radeon HD 6870 X2

2.016 TFLOPS

Radeon HD 7870 XT

VS

Radeon HD 6870 X2

Graphics Card

Nov 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

925 MHz

Base Clock

-

975 MHz

Boost Clock

-

1500 MHz

Memory Clock

1050 MHz

Memory

2GB

Memory Size

1024MB

GDDR5

Memory Type

GDDR5

256bit

Memory Bus

256bit

192.0GB/s

Bandwidth

134.4GB/s

Render Config

24

Compute Units

14

-

1536

Shading Units

1120

96

TMUs

56

32

ROPs

32

-

16 KB (per CU)

L1 Cache

8 KB (per CU)

512 KB

L2 Cache

512 KB

-

Theoretical Performance

31.20 GPixel/s

Pixel Rate

28.80 GPixel/s

93.60 GTexel/s

Texture Rate

50.40 GTexel/s

-

2.995 TFLOPS

FP32 (float)

2.016 TFLOPS

748.8 GFLOPS

FP64 (double)

-

Board Design

185W

TDP

300W

450 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 LE (215-0821122)

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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