AMD Radeon R9 390 X2 vs AMD Radeon R9 280X

VS

AMD Radeon R9 390 X2

AMD Radeon R9 280X

We compared two Desktop platform GPUs: 8GB VRAM Radeon R9 390 X2 and 3GB VRAM Radeon R9 280X to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon R9 390 X2 's Advantages

Released 1 years and 11 months late

More VRAM (8GB vs 3GB)

Larger VRAM bandwidth (345.6GB/s vs 288.0GB/s)

512 additional rendering cores

AMD Radeon R9 280X 's Advantages

Boost Clock1000MHz

Lower TDP (250W vs 580W)

Score

Benchmark

FP32 (float)

Radeon R9 390 X2 +25%

5.12 TFLOPS

Radeon R9 280X

4.096 TFLOPS

Radeon R9 390 X2

VS

Radeon R9 280X

Graphics Card

Sep 2015

Release Date

Oct 2013

Pirate Islands

Generation

Volcanic Islands

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

Base Clock

850 MHz

-

Boost Clock

1000 MHz

1350 MHz

Memory Clock

1500 MHz

Memory

8GB

Memory Size

3GB

GDDR5

Memory Type

GDDR5

512bit

Memory Bus

384bit

345.6GB/s

Bandwidth

288.0GB/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

32.00 GPixel/s

160.0 GTexel/s

Texture Rate

128.0 GTexel/s

-

5.120 TFLOPS

FP32 (float)

4.096 TFLOPS

640.0 GFLOPS

FP64 (double)

1024 GFLOPS

Board Design

580W

TDP

250W

950 W

Suggested PSU

600 W

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

Outputs

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

4x 8-pin

Power Connectors

1x 6-pin + 1x 8-pin

Graphics Processor

Grenada

GPU Name

Tahiti

Grenada PRO (215-0880030)

GPU Variant

Tahiti XTL (215-0821065)

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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