AMD Radeon R9 390 vs AMD Radeon HD 7970

VS

AMD Radeon R9 390

AMD Radeon HD 7970

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

Main Differences

AMD Radeon R9 390 's Advantages

Released 3 years and 6 months late

More VRAM (8GB vs 3GB)

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

512 additional rendering cores

AMD Radeon HD 7970 's Advantages

Lower TDP (250W vs 275W)

Score

Benchmark

FP32 (float)

Radeon R9 390 +35%

5.12 TFLOPS

Radeon HD 7970

3.789 TFLOPS

3DMark Time Spy

Radeon R9 390 +73%

3950

Radeon HD 7970

2279

Radeon R9 390

VS

Radeon HD 7970

Graphics Card

Jun 2015

Release Date

Dec 2011

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

250W

600 W

Suggested PSU

600 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

1x 6-pin + 1x 8-pin

Graphics Processor

Grenada

GPU Name

Tahiti

Grenada PRO (215-0880030)

GPU Variant

Tahiti XT (215-0821060)

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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