AMD Radeon HD 7990 vs AMD Radeon HD 6870

VS

AMD Radeon HD 7990

AMD Radeon HD 6870

We compared two Desktop platform GPUs: 3GB VRAM Radeon HD 7990 and 1024MB VRAM Radeon HD 6870 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 6 months late

Boost Clock1000MHz

More VRAM (3GB vs 1024GB)

Larger VRAM bandwidth (288.0GB/s vs 134.4GB/s)

928 additional rendering cores

AMD Radeon HD 6870 's Advantages

Lower TDP (151W vs 375W)

Score

Benchmark

FP32 (float)

Radeon HD 7990 +103%

4.096 TFLOPS

Radeon HD 6870

2.016 TFLOPS

Radeon HD 7990

VS

Radeon HD 6870

Graphics Card

Apr 2013

Release Date

Oct 2010

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

1050 MHz

Memory

3GB

Memory Size

1024MB

GDDR5

Memory Type

GDDR5

384bit

Memory Bus

256bit

288.0GB/s

Bandwidth

134.4GB/s

Render Config

32

Compute Units

14

-

2048

Shading Units

1120

128

TMUs

56

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

28.80 GPixel/s

128.0 GTexel/s

Texture Rate

50.40 GTexel/s

-

4.096 TFLOPS

FP32 (float)

2.016 TFLOPS

1024 GFLOPS

FP64 (double)

-

Board Design

375W

TDP

151W

750 W

Suggested PSU

450 W

1x DVI 4x mini-DisplayPort 1.2

Outputs

2x DVI 1x HDMI 1.3a 2x mini-DisplayPort 1.1

2x 8-pin

Power Connectors

2x 6-pin

Graphics Processor

Malta

GPU Name

Barts

Malta XT (215-0849026)

GPU Variant

Barts XT (215-0798000)

GCN 1.0

Architecture

TeraScale 2

TSMC

Foundry

TSMC

28 nm

Process Size

40 nm

4.313 billion

Transistors

1.7 billion

365 mm²

Die Size

255 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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