AMD Radeon R9 390 X2 vs AMD Radeon HD 7870 XT

VS

AMD Radeon R9 390 X2

AMD Radeon HD 7870 XT

We compared two Desktop platform GPUs: 8GB VRAM Radeon R9 390 X2 and 2GB VRAM Radeon HD 7870 XT 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 2 years and 10 months late

More VRAM (8GB vs 2GB)

Larger VRAM bandwidth (345.6GB/s vs 192.0GB/s)

1024 additional rendering cores

AMD Radeon HD 7870 XT 's Advantages

Boost Clock975MHz

Lower TDP (185W vs 580W)

Score

Benchmark

FP32 (float)

Radeon R9 390 X2 +70%

5.12 TFLOPS

Radeon HD 7870 XT

2.995 TFLOPS

Radeon R9 390 X2

VS

Radeon HD 7870 XT

Graphics Card

Sep 2015

Release Date

Nov 2012

Pirate Islands

Generation

Southern Islands

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

Base Clock

925 MHz

-

Boost Clock

975 MHz

1350 MHz

Memory Clock

1500 MHz

Memory

8GB

Memory Size

2GB

GDDR5

Memory Type

GDDR5

512bit

Memory Bus

256bit

345.6GB/s

Bandwidth

192.0GB/s

Render Config

40

Compute Units

24

-

2560

Shading Units

1536

160

TMUs

96

64

ROPs

32

-

16 KB (per CU)

L1 Cache

16 KB (per CU)

1024 KB

L2 Cache

512 KB

-

Theoretical Performance

64.00 GPixel/s

Pixel Rate

31.20 GPixel/s

160.0 GTexel/s

Texture Rate

93.60 GTexel/s

-

5.120 TFLOPS

FP32 (float)

2.995 TFLOPS

640.0 GFLOPS

FP64 (double)

748.8 GFLOPS

Board Design

580W

TDP

185W

950 W

Suggested PSU

450 W

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

Outputs

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

4x 8-pin

Power Connectors

2x 6-pin

Graphics Processor

Grenada

GPU Name

Tahiti

Grenada PRO (215-0880030)

GPU Variant

Tahiti LE (215-0821122)

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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