AMD Radeon HD 7870 GHz Edition vs AMD Radeon R9 390X

VS

AMD Radeon HD 7870 GHz Edition

AMD Radeon R9 390X

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

Lower TDP (175W vs 275W)

AMD Radeon R9 390X 's Advantages

Released 3 years and 3 months late

More VRAM (8GB vs 2GB)

Larger VRAM bandwidth (384.0GB/s vs 153.6GB/s)

1536 additional rendering cores

Score

Benchmark

FP32 (float)

Radeon HD 7870 GHz Edition

2.56 TFLOPS

Radeon R9 390X +131%

5.914 TFLOPS

Radeon HD 7870 GHz Edition

VS

Radeon R9 390X

Graphics Card

Mar 2012

Release Date

Jun 2015

Southern Islands

Generation

Pirate Islands

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

1200 MHz

Memory Clock

1500 MHz

Memory

2GB

Memory Size

8GB

GDDR5

Memory Type

GDDR5

256bit

Memory Bus

512bit

153.6GB/s

Bandwidth

384.0GB/s

Render Config

20

Compute Units

44

-

1280

Shading Units

2816

80

TMUs

176

32

ROPs

64

-

16 KB (per CU)

L1 Cache

16 KB (per CU)

512 KB

L2 Cache

1024 KB

-

Theoretical Performance

32.00 GPixel/s

Pixel Rate

67.20 GPixel/s

80.00 GTexel/s

Texture Rate

184.8 GTexel/s

-

2.560 TFLOPS

FP32 (float)

5.914 TFLOPS

160.0 GFLOPS

FP64 (double)

739.2 GFLOPS

Board Design

175W

TDP

275W

450 W

Suggested PSU

600 W

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

Outputs

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

2x 6-pin

Power Connectors

1x 6-pin + 1x 8-pin

Graphics Processor

Pitcairn

GPU Name

Grenada

Pitcairn XT (215-0828047)

GPU Variant

Grenada XT (215-0880004)

GCN 1.0

Architecture

GCN 2.0

TSMC

Foundry

TSMC

28 nm

Process Size

28 nm

2.8 billion

Transistors

6.2 billion

212 mm²

Die Size

438 mm²

Graphics Features

12 (11_1)

DirectX

12 (12_0)

4.6

OpenGL

4.6

1.2

OpenCL

2.0

1.2

Vulkan

1.2

-

5.1

Shader Model

6.3

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