AMD Radeon R9 390 vs AMD Radeon HD 7970 X2

VS

AMD Radeon R9 390

AMD Radeon HD 7970 X2

We compared two Desktop platform GPUs: 8GB VRAM Radeon R9 390 and 3GB VRAM Radeon HD 7970 X2 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon R9 390 's Advantages

Released 2 years and 10 months late

More VRAM (8GB vs 3GB)

Larger VRAM bandwidth (384.0GB/s vs 264.0GB/s)

512 additional rendering cores

Lower TDP (275W vs 500W)

Score

Benchmark

FP32 (float)

Radeon R9 390 +35%

5.12 TFLOPS

Radeon HD 7970 X2

3.789 TFLOPS

Radeon R9 390

VS

Radeon HD 7970 X2

Graphics Card

Jun 2015

Release Date

Aug 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

1375 MHz

Memory

8GB

Memory Size

3GB

GDDR5

Memory Type

GDDR5

512bit

Memory Bus

384bit

384.0GB/s

Bandwidth

264.0GB/s

Render Config

40

Compute Units

32

-

2560

Shading Units

2048

160

TMUs

128

64

ROPs

32

-

16 KB (per CU)

L1 Cache

16 KB (per CU)

1024 KB

L2 Cache

768 KB

-

Theoretical Performance

64.00 GPixel/s

Pixel Rate

29.60 GPixel/s

160.0 GTexel/s

Texture Rate

118.4 GTexel/s

-

5.120 TFLOPS

FP32 (float)

3.789 TFLOPS

640.0 GFLOPS

FP64 (double)

947.2 GFLOPS

Board Design

275W

TDP

500W

600 W

Suggested PSU

900 W

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

Outputs

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

1x 6-pin + 1x 8-pin

Power Connectors

3x 8-pin

Graphics Processor

Grenada

GPU Name

New Zealand

Grenada PRO (215-0880030)

GPU Variant

-

GCN 2.0

Architecture

GCN 1.0

TSMC

Foundry

TSMC

28 nm

Process Size

28 nm

6.2 billion

Transistors

4.313 billion

438 mm²

Die Size

352 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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