AMD Radeon R9 390X vs AMD Radeon HD 7990

VS

AMD Radeon R9 390X

AMD Radeon HD 7990

We compared two Desktop platform GPUs: 8GB VRAM Radeon R9 390X and 3GB VRAM Radeon HD 7990 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon R9 390X 's Advantages

Released 2 years and 2 months late

More VRAM (8GB vs 3GB)

Larger VRAM bandwidth (384.0GB/s vs 288.0GB/s)

768 additional rendering cores

Lower TDP (275W vs 375W)

AMD Radeon HD 7990 's Advantages

Boost Clock1000MHz

Score

Benchmark

FP32 (float)

Radeon R9 390X +44%

5.914 TFLOPS

Radeon HD 7990

4.096 TFLOPS

Radeon R9 390X

VS

Radeon HD 7990

Graphics Card

Jun 2015

Release Date

Apr 2013

Pirate Islands

Generation

Southern Islands

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

Base Clock

950 MHz

-

Boost Clock

1000 MHz

1500 MHz

Memory Clock

1500 MHz

Memory

8GB

Memory Size

3GB

GDDR5

Memory Type

GDDR5

512bit

Memory Bus

384bit

384.0GB/s

Bandwidth

288.0GB/s

Render Config

44

Compute Units

32

-

2816

Shading Units

2048

176

TMUs

128

64

ROPs

32

-

16 KB (per CU)

L1 Cache

16 KB (per CU)

1024 KB

L2 Cache

768 KB

-

Theoretical Performance

67.20 GPixel/s

Pixel Rate

32.00 GPixel/s

184.8 GTexel/s

Texture Rate

128.0 GTexel/s

-

5.914 TFLOPS

FP32 (float)

4.096 TFLOPS

739.2 GFLOPS

FP64 (double)

1024 GFLOPS

Board Design

275W

TDP

375W

600 W

Suggested PSU

750 W

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

Outputs

1x DVI 4x mini-DisplayPort 1.2

1x 6-pin + 1x 8-pin

Power Connectors

2x 8-pin

Graphics Processor

Grenada

GPU Name

Malta

Grenada XT (215-0880004)

GPU Variant

Malta XT (215-0849026)

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

365 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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