AMD Radeon HD 6990 vs AMD Radeon HD 8770 OEM

VS

AMD Radeon HD 6990

AMD Radeon HD 8770 OEM

We compared two Desktop platform GPUs: 2GB VRAM Radeon HD 6990 and 1024MB VRAM Radeon HD 8770 OEM 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 1024GB)

Larger VRAM bandwidth (160.0GB/s vs 96.00GB/s)

640 additional rendering cores

AMD Radeon HD 8770 OEM 's Advantages

Released 2 years and 6 months late

Lower TDP (85W vs 375W)

Score

Benchmark

FP32 (float)

Radeon HD 6990 +35%

2.55 TFLOPS

Radeon HD 8770 OEM

1.882 TFLOPS

Radeon HD 6990

VS

Radeon HD 8770 OEM

Graphics Card

Mar 2011

Release Date

Sep 2013

Northern Islands

Generation

Sea Islands

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

1250 MHz

Memory Clock

1500 MHz

Memory

2GB

Memory Size

1024MB

GDDR5

Memory Type

GDDR5

256bit

Memory Bus

128bit

160.0GB/s

Bandwidth

96.00GB/s

Render Config

24

Compute Units

14

-

1536

Shading Units

896

96

TMUs

56

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

16.80 GPixel/s

79.68 GTexel/s

Texture Rate

58.80 GTexel/s

-

2.550 TFLOPS

FP32 (float)

1.882 TFLOPS

637.4 GFLOPS

FP64 (double)

117.6 GFLOPS

Board Design

375W

TDP

85W

750 W

Suggested PSU

250 W

1x DVI 4x mini-DisplayPort 1.2

Outputs

1x DVI 1x HDMI 1.4a 2x mini-DisplayPort 1.2

2x 8-pin

Power Connectors

1x 6-pin

Graphics Processor

Antilles

GPU Name

Bonaire

Antilles XT (215-0807027)

GPU Variant

Bonaire XT (215-0839039)

TeraScale 3

Architecture

GCN 2.0

TSMC

Foundry

TSMC

40 nm

Process Size

28 nm

2.64 billion

Transistors

2.08 billion

389 mm²

Die Size

160 mm²

Graphics Features

11.2 (11_0)

DirectX

12 (12_0)

4.4

OpenGL

4.6

1.2

OpenCL

2.0

N/A

Vulkan

1.2

-

5.0

Shader Model

6.3

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