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

VS

AMD Radeon R9 390X

AMD Radeon HD 7870 GHz Edition

We compared two Desktop platform GPUs: 8GB VRAM Radeon R9 390X and 2GB VRAM Radeon HD 7870 GHz Edition to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

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

AMD Radeon HD 7870 GHz Edition 's Advantages

Lower TDP (175W vs 275W)

Score

Benchmark

FP32 (float)

Radeon R9 390X +131%

5.914 TFLOPS

Radeon HD 7870 GHz Edition

2.56 TFLOPS

Radeon R9 390X

VS

Radeon HD 7870 GHz Edition

Graphics Card

Jun 2015

Release Date

Mar 2012

Pirate Islands

Generation

Southern Islands

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

1500 MHz

Memory Clock

1200 MHz

Memory

8GB

Memory Size

2GB

GDDR5

Memory Type

GDDR5

512bit

Memory Bus

256bit

384.0GB/s

Bandwidth

153.6GB/s

Render Config

44

Compute Units

20

-

2816

Shading Units

1280

176

TMUs

80

64

ROPs

32

-

16 KB (per CU)

L1 Cache

16 KB (per CU)

1024 KB

L2 Cache

512 KB

-

Theoretical Performance

67.20 GPixel/s

Pixel Rate

32.00 GPixel/s

184.8 GTexel/s

Texture Rate

80.00 GTexel/s

-

5.914 TFLOPS

FP32 (float)

2.560 TFLOPS

739.2 GFLOPS

FP64 (double)

160.0 GFLOPS

Board Design

275W

TDP

175W

600 W

Suggested PSU

450 W

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

Outputs

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

1x 6-pin + 1x 8-pin

Power Connectors

2x 6-pin

Graphics Processor

Grenada

GPU Name

Pitcairn

Grenada XT (215-0880004)

GPU Variant

Pitcairn XT (215-0828047)

GCN 2.0

Architecture

GCN 1.0

TSMC

Foundry

TSMC

28 nm

Process Size

28 nm

6.2 billion

Transistors

2.8 billion

438 mm²

Die Size

212 mm²

Graphics Features

12 (12_0)

DirectX

12 (11_1)

4.6

OpenGL

4.6

2.0

OpenCL

1.2

Vulkan

1.2

-

6.3

Shader Model

5.1

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