AMD Radeon HD 7990 vs AMD Radeon HD 6990

VS

AMD Radeon HD 7990

AMD Radeon HD 6990

We compared two Desktop platform GPUs: 3GB VRAM Radeon HD 7990 and 2GB VRAM Radeon HD 6990 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 7990 +60%

4.096 TFLOPS

Radeon HD 6990

2.55 TFLOPS

Radeon HD 7990

VS

Radeon HD 6990

Graphics Card

Apr 2013

Release Date

Mar 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

1250 MHz

Memory

3GB

Memory Size

2GB

GDDR5

Memory Type

GDDR5

384bit

Memory Bus

256bit

288.0GB/s

Bandwidth

160.0GB/s

Render Config

32

Compute Units

24

-

2048

Shading Units

1536

128

TMUs

96

32

ROPs

32

-

16 KB (per CU)

L1 Cache

8 KB (per CU)

768 KB

L2 Cache

512 KB

-

Theoretical Performance

32.00 GPixel/s

Pixel Rate

26.56 GPixel/s

128.0 GTexel/s

Texture Rate

79.68 GTexel/s

-

4.096 TFLOPS

FP32 (float)

2.550 TFLOPS

1024 GFLOPS

FP64 (double)

637.4 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

Malta

GPU Name

Antilles

Malta XT (215-0849026)

GPU Variant

Antilles XT (215-0807027)

GCN 1.0

Architecture

TeraScale 3

TSMC

Foundry

TSMC

28 nm

Process Size

40 nm

4.313 billion

Transistors

2.64 billion

365 mm²

Die Size

389 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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