AMD Radeon HD 7870 XT vs AMD Radeon R9 390

VS

AMD Radeon HD 7870 XT

AMD Radeon R9 390

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

Boost Clock975MHz

Lower TDP (185W vs 275W)

AMD Radeon R9 390 's Advantages

Released 2 years and 7 months late

More VRAM (8GB vs 2GB)

Larger VRAM bandwidth (384.0GB/s vs 192.0GB/s)

1024 additional rendering cores

Score

Benchmark

FP32 (float)

Radeon HD 7870 XT

2.995 TFLOPS

Radeon R9 390 +70%

5.12 TFLOPS

Radeon HD 7870 XT

VS

Radeon R9 390

Graphics Card

Nov 2012

Release Date

Jun 2015

Southern Islands

Generation

Pirate 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

1500 MHz

Memory

2GB

Memory Size

8GB

GDDR5

Memory Type

GDDR5

256bit

Memory Bus

512bit

192.0GB/s

Bandwidth

384.0GB/s

Render Config

24

Compute Units

40

-

1536

Shading Units

2560

96

TMUs

160

32

ROPs

64

-

16 KB (per CU)

L1 Cache

16 KB (per CU)

512 KB

L2 Cache

1024 KB

-

Theoretical Performance

31.20 GPixel/s

Pixel Rate

64.00 GPixel/s

93.60 GTexel/s

Texture Rate

160.0 GTexel/s

-

2.995 TFLOPS

FP32 (float)

5.120 TFLOPS

748.8 GFLOPS

FP64 (double)

640.0 GFLOPS

Board Design

185W

TDP

275W

450 W

Suggested PSU

600 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

1x 6-pin + 1x 8-pin

Graphics Processor

Tahiti

GPU Name

Grenada

Tahiti LE (215-0821122)

GPU Variant

Grenada PRO (215-0880030)

GCN 1.0

Architecture

GCN 2.0

TSMC

Foundry

TSMC

28 nm

Process Size

28 nm

4.313 billion

Transistors

6.2 billion

352 mm²

Die Size

438 mm²

Graphics Features

12 (11_1)

DirectX

12 (12_0)

4.6

OpenGL

4.6

1.2

OpenCL

2.0

1.2

Vulkan

1.2

-

5.1

Shader Model

6.3

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