AMD Radeon HD 6870 vs AMD Radeon R9 390X

VS

AMD Radeon HD 6870

AMD Radeon R9 390X

We compared two Desktop platform GPUs: 1024MB VRAM Radeon HD 6870 and 8GB VRAM Radeon R9 390X to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 6870 's Advantages

Lower TDP (151W vs 275W)

AMD Radeon R9 390X 's Advantages

Released 4 years and 8 months late

More VRAM (8GB vs 1024GB)

Larger VRAM bandwidth (384.0GB/s vs 134.4GB/s)

1696 additional rendering cores

Score

Benchmark

FP32 (float)

Radeon HD 6870

2.016 TFLOPS

Radeon R9 390X +193%

5.914 TFLOPS

Radeon HD 6870

VS

Radeon R9 390X

Graphics Card

Oct 2010

Release Date

Jun 2015

Northern Islands

Generation

Pirate Islands

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

1050 MHz

Memory Clock

1500 MHz

Memory

1024MB

Memory Size

8GB

GDDR5

Memory Type

GDDR5

256bit

Memory Bus

512bit

134.4GB/s

Bandwidth

384.0GB/s

Render Config

14

Compute Units

44

-

1120

Shading Units

2816

56

TMUs

176

32

ROPs

64

-

8 KB (per CU)

L1 Cache

16 KB (per CU)

512 KB

L2 Cache

1024 KB

-

Theoretical Performance

28.80 GPixel/s

Pixel Rate

67.20 GPixel/s

50.40 GTexel/s

Texture Rate

184.8 GTexel/s

-

2.016 TFLOPS

FP32 (float)

5.914 TFLOPS

-

FP64 (double)

739.2 GFLOPS

Board Design

151W

TDP

275W

450 W

Suggested PSU

600 W

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

Outputs

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

2x 6-pin

Power Connectors

1x 6-pin + 1x 8-pin

Graphics Processor

Barts

GPU Name

Grenada

Barts XT (215-0798000)

GPU Variant

Grenada XT (215-0880004)

TeraScale 2

Architecture

GCN 2.0

TSMC

Foundry

TSMC

40 nm

Process Size

28 nm

1.7 billion

Transistors

6.2 billion

255 mm²

Die Size

438 mm²

Graphics Features

11.2 (11_0)

DirectX

12 (12_0)

4.4

OpenGL

4.6

1.2

OpenCL

2.0

N/A

Vulkan

1.2

-

5.0

Shader Model

6.3

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