AMD Radeon HD 6990 vs ATI Radeon HD 4580

VS

AMD Radeon HD 6990

ATI Radeon HD 4580

We compared two Desktop platform GPUs: 2GB VRAM Radeon HD 6990 and 512MB VRAM Radeon HD 4580 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 6990 's Advantages

More VRAM (2GB vs 512GB)

Larger VRAM bandwidth (160.0GB/s vs 22.18GB/s)

1416 additional rendering cores

ATI Radeon HD 4580 's Advantages

Released 8 months late

Lower TDP (65W vs 375W)

Score

Benchmark

FP32 (float)

Radeon HD 6990 +1235%

2.55 TFLOPS

Radeon HD 4580

0.191 TFLOPS

Radeon HD 6990

VS

Radeon HD 4580

Graphics Card

Mar 2011

Release Date

Nov 2011

Northern Islands

Generation

Radeon R700

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

1250 MHz

Memory Clock

693 MHz

Memory

2GB

Memory Size

512MB

GDDR5

Memory Type

GDDR3

256bit

Memory Bus

128bit

160.0GB/s

Bandwidth

22.18GB/s

Render Config

24

Compute Units

3

-

1536

Shading Units

120

96

TMUs

8

32

ROPs

4

-

8 KB (per CU)

L1 Cache

-

512 KB

L2 Cache

128 KB

-

Theoretical Performance

26.56 GPixel/s

Pixel Rate

3.184 GPixel/s

79.68 GTexel/s

Texture Rate

6.368 GTexel/s

-

2.550 TFLOPS

FP32 (float)

191.0 GFLOPS

637.4 GFLOPS

FP64 (double)

-

Board Design

375W

TDP

65W

750 W

Suggested PSU

250 W

1x DVI 4x mini-DisplayPort 1.2

Outputs

2x DVI 1x S-Video

2x 8-pin

Power Connectors

None

Graphics Processor

Antilles

GPU Name

RV635

Antilles XT (215-0807027)

GPU Variant

RV635 PRO (215-0682008)

TeraScale 3

Architecture

TeraScale

TSMC

Foundry

TSMC

40 nm

Process Size

55 nm

2.64 billion

Transistors

0.378 billion

389 mm²

Die Size

135 mm²

Graphics Features

11.2 (11_0)

DirectX

10.1 (10_1)

4.4

OpenGL

3.3

1.2

OpenCL

N/A

Vulkan

N/A

-

5.0

Shader Model

4.1

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