AMD Radeon HD 6990 vs AMD Radeon R9 255 OEM

VS

AMD Radeon HD 6990

AMD Radeon R9 255 OEM

We compared two Desktop platform GPUs: 2GB VRAM Radeon HD 6990 and 2GB VRAM Radeon R9 255 OEM to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 6990 's Advantages

Larger VRAM bandwidth (160.0GB/s vs 73.60GB/s)

1024 additional rendering cores

AMD Radeon R9 255 OEM 's Advantages

Released 2 years and 9 months late

Boost Clock930MHz

Lower TDP (65W vs 375W)

Score

Benchmark

FP32 (float)

Radeon HD 6990 +167%

2.55 TFLOPS

Radeon R9 255 OEM

0.952 TFLOPS

Radeon HD 6990

VS

Radeon R9 255 OEM

Graphics Card

Mar 2011

Release Date

Dec 2013

Northern Islands

Generation

Volcanic Islands

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

Base Clock

900 MHz

-

Boost Clock

930 MHz

1250 MHz

Memory Clock

1150 MHz

Memory

2GB

Memory Size

2GB

GDDR5

Memory Type

GDDR5

256bit

Memory Bus

128bit

160.0GB/s

Bandwidth

73.60GB/s

Render Config

24

Compute Units

8

-

1536

Shading Units

512

96

TMUs

32

ROPs

16

-

8 KB (per CU)

L1 Cache

16 KB (per CU)

512 KB

L2 Cache

256 KB

-

Theoretical Performance

26.56 GPixel/s

Pixel Rate

14.88 GPixel/s

79.68 GTexel/s

Texture Rate

29.76 GTexel/s

-

2.550 TFLOPS

FP32 (float)

952.3 GFLOPS

637.4 GFLOPS

FP64 (double)

59.52 GFLOPS

Board Design

375W

TDP

65W

750 W

Suggested PSU

250 W

1x DVI 4x mini-DisplayPort 1.2

Outputs

No outputs

2x 8-pin

Power Connectors

1x 6-pin

Graphics Processor

Antilles

GPU Name

Cape Verde

Antilles XT (215-0807027)

GPU Variant

Cape Verde PRX

TeraScale 3

Architecture

GCN 1.0

TSMC

Foundry

TSMC

40 nm

Process Size

28 nm

2.64 billion

Transistors

1.5 billion

389 mm²

Die Size

123 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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