AMD Radeon HD 6870 X2 vs AMD Radeon R9 390 X2

VS

AMD Radeon HD 6870 X2

AMD Radeon R9 390 X2

We compared two Desktop platform GPUs: 1024MB VRAM Radeon HD 6870 X2 and 8GB VRAM Radeon R9 390 X2 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 6870 X2 's Advantages

Lower TDP (300W vs 580W)

AMD Radeon R9 390 X2 's Advantages

Released 4 years and 2 months late

More VRAM (8GB vs 1024GB)

Larger VRAM bandwidth (345.6GB/s vs 134.4GB/s)

1440 additional rendering cores

Score

Benchmark

FP32 (float)

Radeon HD 6870 X2

2.016 TFLOPS

Radeon R9 390 X2 +153%

5.12 TFLOPS

Radeon HD 6870 X2

VS

Radeon R9 390 X2

Graphics Card

Jul 2011

Release Date

Sep 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

1350 MHz

Memory

1024MB

Memory Size

8GB

GDDR5

Memory Type

GDDR5

256bit

Memory Bus

512bit

134.4GB/s

Bandwidth

345.6GB/s

Render Config

14

Compute Units

40

-

1120

Shading Units

2560

56

TMUs

160

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

64.00 GPixel/s

50.40 GTexel/s

Texture Rate

160.0 GTexel/s

-

2.016 TFLOPS

FP32 (float)

5.120 TFLOPS

-

FP64 (double)

640.0 GFLOPS

Board Design

300W

TDP

580W

700 W

Suggested PSU

950 W

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

Outputs

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

-

Power Connectors

4x 8-pin

Graphics Processor

Barts

GPU Name

Grenada

Barts XT (215-0798000)

GPU Variant

Grenada PRO (215-0880030)

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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