AMD Radeon R9 390 X2 vs AMD Radeon R9 285

VS

We compared two Desktop platform GPUs: 8GB VRAM Radeon R9 390 X2 and 2GB VRAM Radeon R9 285 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 late

More VRAM (8GB vs 2GB)

Larger VRAM bandwidth (345.6GB/s vs 176.0GB/s)

768 additional rendering cores

AMD Radeon R9 285 's Advantages

Lower TDP (190W vs 580W)

Score

Benchmark

FP32 (float)

Radeon R9 390 X2 +55%

5.12 TFLOPS

Radeon R9 285

3.29 TFLOPS

Radeon R9 390 X2

VS

Radeon R9 285

Graphics Card

Sep 2015

Release Date

Sep 2014

Pirate Islands

Generation

Volcanic Islands

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

Base Clock

-

Boost Clock

-

1350 MHz

Memory Clock

1375 MHz

Memory

8GB

Memory Size

2GB

GDDR5

Memory Type

GDDR5

512bit

Memory Bus

256bit

345.6GB/s

Bandwidth

176.0GB/s

Render Config

-

SM Count

-

40

Compute Units

28

2560

Shading Units

1792

160

TMUs

112

64

ROPs

32

-

Tensor Cores

-

RT Cores

-

16 KB (per CU)

L1 Cache

16 KB (per CU)

1024 KB

L2 Cache

512 KB

Theoretical Performance

64.00 GPixel/s

Pixel Rate

29.38 GPixel/s

160.0 GTexel/s

Texture Rate

102.8 GTexel/s

-

FP16 (half)

3.290 TFLOPS

5.120 TFLOPS

FP32 (float)

3.290 TFLOPS

640.0 GFLOPS

FP64 (double)

205.6 GFLOPS

Graphics Processor

Grenada

GPU Name

Tonga

Grenada PRO (215-0880030)

GPU Variant

Tonga PRO (215-0851128)

GCN 2.0

Architecture

GCN 3.0

TSMC

Foundry

TSMC

28 nm

Process Size

28 nm

6.2 billion

Transistors

5 billion

438 mm²

Die Size

366 mm²

Board Design

580W

TDP

190W

950 W

Suggested PSU

450 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

2x 6-pin

Graphics Features

12 (12_0)

DirectX

12 (12_0)

4.6

OpenGL

4.6

2.0

OpenCL

2.1

1.2

Vulkan

1.2.170

-

CUDA

-

6.3

Shader Model

6.5

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