AMD Radeon HD 7990 vs AMD Radeon HD 6390

VS

AMD Radeon HD 7990

AMD Radeon HD 6390

We compared two Desktop platform GPUs: 3GB VRAM Radeon HD 7990 and 1024MB VRAM Radeon HD 6390 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 7990 's Advantages

Released 1 years and 9 months late

Boost Clock1000MHz

More VRAM (3GB vs 1024GB)

Larger VRAM bandwidth (288.0GB/s vs 16.00GB/s)

1728 additional rendering cores

AMD Radeon HD 6390 's Advantages

Lower TDP (39W vs 375W)

Score

Benchmark

FP32 (float)

Radeon HD 7990 +1063%

4.096 TFLOPS

Radeon HD 6390

0.352 TFLOPS

Radeon HD 7990

VS

Radeon HD 6390

Graphics Card

Apr 2013

Release Date

Jul 2011

Southern Islands

Generation

Northern Islands

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

950 MHz

Base Clock

-

1000 MHz

Boost Clock

-

1500 MHz

Memory Clock

500 MHz

Memory

3GB

Memory Size

1024MB

GDDR5

Memory Type

DDR2

384bit

Memory Bus

128bit

288.0GB/s

Bandwidth

16.00GB/s

Render Config

32

Compute Units

4

-

2048

Shading Units

320

128

TMUs

16

32

ROPs

8

-

16 KB (per CU)

L1 Cache

8 KB (per CU)

768 KB

L2 Cache

256 KB

-

Theoretical Performance

32.00 GPixel/s

Pixel Rate

4.400 GPixel/s

128.0 GTexel/s

Texture Rate

8.800 GTexel/s

-

4.096 TFLOPS

FP32 (float)

352.0 GFLOPS

1024 GFLOPS

FP64 (double)

-

Board Design

375W

TDP

39W

750 W

Suggested PSU

200 W

1x DVI 4x mini-DisplayPort 1.2

Outputs

1x DVI 1x HDMI 1.3a 1x VGA

2x 8-pin

Power Connectors

None

Graphics Processor

Malta

GPU Name

Redwood

Malta XT (215-0849026)

GPU Variant

Redwood LE

GCN 1.0

Architecture

TeraScale 2

TSMC

Foundry

TSMC

28 nm

Process Size

40 nm

4.313 billion

Transistors

0.627 billion

365 mm²

Die Size

104 mm²

Graphics Features

12 (11_1)

DirectX

11.2 (11_0)

4.6

OpenGL

4.4

1.2

OpenCL

1.2

Vulkan

N/A

-

5.1

Shader Model

5.0

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