AMD Radeon HD 7990 vs AMD Radeon HD 6870 1600SP Edition

VS

AMD Radeon HD 7990

AMD Radeon HD 6870 1600SP Edition

We compared two Desktop platform GPUs: 3GB VRAM Radeon HD 7990 and 1024MB VRAM Radeon HD 6870 1600SP Edition to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 7990 's Advantages

Boost Clock1000MHz

More VRAM (3GB vs 1024GB)

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

448 additional rendering cores

AMD Radeon HD 6870 1600SP Edition 's Advantages

Lower TDP (175W vs 375W)

Score

Benchmark

FP32 (float)

Radeon HD 7990 +50%

4.096 TFLOPS

Radeon HD 6870 1600SP Edition

2.72 TFLOPS

Radeon HD 7990

VS

Radeon HD 6870 1600SP Edition

Graphics Card

Apr 2013

Release Date

Jan 2013

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

20

-

2048

Shading Units

1600

128

TMUs

80

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

27.20 GPixel/s

128.0 GTexel/s

Texture Rate

68.00 GTexel/s

-

4.096 TFLOPS

FP32 (float)

2.720 TFLOPS

1024 GFLOPS

FP64 (double)

544.0 GFLOPS

Board Design

375W

TDP

175W

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

Cypress

Malta XT (215-0849026)

GPU Variant

Cypress XT (215-0735033)

GCN 1.0

Architecture

TeraScale 2

TSMC

Foundry

TSMC

28 nm

Process Size

40 nm

4.313 billion

Transistors

2.154 billion

365 mm²

Die Size

334 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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