AMD Radeon HD 7870 XT vs AMD Radeon R9 285

VS

AMD Radeon HD 7870 XT

AMD Radeon R9 285

We compared two Desktop platform GPUs: 2GB VRAM Radeon HD 7870 XT 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 HD 7870 XT 's Advantages

Boost Clock975MHz

Larger VRAM bandwidth (192.0GB/s vs 176.0GB/s)

Lower TDP (185W vs 190W)

AMD Radeon R9 285 's Advantages

Released 1 years and 10 months late

256 additional rendering cores

Score

Benchmark

FP32 (float)

Radeon HD 7870 XT

2.995 TFLOPS

Radeon R9 285 +9%

3.29 TFLOPS

Radeon HD 7870 XT

VS

Radeon R9 285

Graphics Card

Nov 2012

Release Date

Sep 2014

Southern Islands

Generation

Volcanic Islands

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

925 MHz

Base Clock

-

975 MHz

Boost Clock

-

1500 MHz

Memory Clock

1375 MHz

Memory

2GB

Memory Size

2GB

GDDR5

Memory Type

GDDR5

256bit

Memory Bus

256bit

192.0GB/s

Bandwidth

176.0GB/s

Render Config

24

Compute Units

28

-

1536

Shading Units

1792

96

TMUs

112

32

ROPs

32

-

16 KB (per CU)

L1 Cache

16 KB (per CU)

512 KB

L2 Cache

512 KB

-

Theoretical Performance

31.20 GPixel/s

Pixel Rate

29.38 GPixel/s

93.60 GTexel/s

Texture Rate

102.8 GTexel/s

-

FP16 (half)

3.290 TFLOPS

2.995 TFLOPS

FP32 (float)

3.290 TFLOPS

748.8 GFLOPS

FP64 (double)

205.6 GFLOPS

Board Design

185W

TDP

190W

450 W

Suggested PSU

450 W

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

Outputs

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

2x 6-pin

Power Connectors

2x 6-pin

Graphics Processor

Tahiti

GPU Name

Tonga

Tahiti LE (215-0821122)

GPU Variant

Tonga PRO (215-0851128)

GCN 1.0

Architecture

GCN 3.0

TSMC

Foundry

TSMC

28 nm

Process Size

28 nm

4.313 billion

Transistors

5 billion

352 mm²

Die Size

366 mm²

Graphics Features

12 (11_1)

DirectX

12 (12_0)

4.6

OpenGL

4.6

1.2

OpenCL

2.1

1.2

Vulkan

1.2.170

-

5.1

Shader Model

6.5

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