AMD Radeon HD 6990 vs AMD Radeon HD 7990

VS

AMD Radeon HD 6990

AMD Radeon HD 7990

We compared two Desktop platform GPUs: 2GB VRAM Radeon HD 6990 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 HD 7990 's Advantages

Released 2 years and 1 months late

Boost Clock1000MHz

More VRAM (3GB vs 2GB)

Larger VRAM bandwidth (288.0GB/s vs 160.0GB/s)

512 additional rendering cores

Score

Benchmark

FP32 (float)

Radeon HD 6990

2.55 TFLOPS

Radeon HD 7990 +60%

4.096 TFLOPS

Radeon HD 6990

VS

Radeon HD 7990

Graphics Card

Mar 2011

Release Date

Apr 2013

Northern Islands

Generation

Southern Islands

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

Base Clock

950 MHz

-

Boost Clock

1000 MHz

1250 MHz

Memory Clock

1500 MHz

Memory

2GB

Memory Size

3GB

GDDR5

Memory Type

GDDR5

256bit

Memory Bus

384bit

160.0GB/s

Bandwidth

288.0GB/s

Render Config

24

Compute Units

32

-

1536

Shading Units

2048

96

TMUs

128

32

ROPs

32

-

8 KB (per CU)

L1 Cache

16 KB (per CU)

512 KB

L2 Cache

768 KB

-

Theoretical Performance

26.56 GPixel/s

Pixel Rate

32.00 GPixel/s

79.68 GTexel/s

Texture Rate

128.0 GTexel/s

-

2.550 TFLOPS

FP32 (float)

4.096 TFLOPS

637.4 GFLOPS

FP64 (double)

1024 GFLOPS

Board Design

375W

TDP

375W

750 W

Suggested PSU

750 W

1x DVI 4x mini-DisplayPort 1.2

Outputs

1x DVI 4x mini-DisplayPort 1.2

2x 8-pin

Power Connectors

2x 8-pin

Graphics Processor

Antilles

GPU Name

Malta

Antilles XT (215-0807027)

GPU Variant

Malta XT (215-0849026)

TeraScale 3

Architecture

GCN 1.0

TSMC

Foundry

TSMC

40 nm

Process Size

28 nm

2.64 billion

Transistors

4.313 billion

389 mm²

Die Size

365 mm²

Graphics Features

11.2 (11_0)

DirectX

12 (11_1)

4.4

OpenGL

4.6

1.2

OpenCL

1.2

N/A

Vulkan

1.2

-

5.0

Shader Model

5.1

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