AMD Radeon R9 285X vs AMD Radeon R9 390

VS

We compared two Desktop platform GPUs: 3GB VRAM Radeon R9 285X and 8GB VRAM Radeon R9 390 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon R9 285X 's Advantages

Lower TDP (200W vs 275W)

AMD Radeon R9 390 's Advantages

More VRAM (8GB vs 3GB)

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

512 additional rendering cores

Score

Benchmark

FP32 (float)

Radeon R9 285X

4.104 TFLOPS

Radeon R9 390 +24%

5.12 TFLOPS

Radeon R9 285X

VS

Radeon R9 390

Graphics Card

Unknown

Release Date

Jun 2015

Volcanic Islands

Generation

Pirate Islands

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

Base Clock

-

Boost Clock

-

1375 MHz

Memory Clock

1500 MHz

Memory

3GB

Memory Size

8GB

GDDR5

Memory Type

GDDR5

384bit

Memory Bus

512bit

264.0GB/s

Bandwidth

384.0GB/s

Render Config

-

SM Count

-

32

Compute Units

40

2048

Shading Units

2560

128

TMUs

160

32

ROPs

64

-

Tensor Cores

-

RT Cores

-

16 KB (per CU)

L1 Cache

16 KB (per CU)

768 KB

L2 Cache

1024 KB

Theoretical Performance

32.06 GPixel/s

Pixel Rate

64.00 GPixel/s

128.3 GTexel/s

Texture Rate

160.0 GTexel/s

-

FP16 (half)

-

4.104 TFLOPS

FP32 (float)

5.120 TFLOPS

-

FP64 (double)

640.0 GFLOPS

Graphics Processor

Tonga

GPU Name

Grenada

Tonga XT (215-0851313)

GPU Variant

Grenada PRO (215-0880030)

GCN 3.0

Architecture

GCN 2.0

TSMC

Foundry

TSMC

28 nm

Process Size

28 nm

5 billion

Transistors

6.2 billion

366 mm²

Die Size

438 mm²

Board Design

200W

TDP

275W

550 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

1x 6-pin + 1x 8-pin

Power Connectors

1x 6-pin + 1x 8-pin

Graphics Features

12 (12_0)

DirectX

12 (12_0)

4.6

OpenGL

4.6

2.0

OpenCL

2.0

1.2

Vulkan

1.2

-

CUDA

-

6.3

Shader Model

6.3

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