AMD Radeon HD 6990 vs ATI Radeon HD 4770

VS

We compared two Desktop platform GPUs: 2GB VRAM Radeon HD 6990 and 512MB VRAM Radeon HD 4770 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon HD 6990 's Advantages

Released 1 years and 11 months late

Larger VRAM bandwidth (160.0GB/s vs 51.20GB/s)

896 additional rendering cores

ATI Radeon HD 4770 's Advantages

Lower TDP (80W vs 375W)

Score

Benchmark

FP32 (float)

Radeon HD 6990 +165%

2.55 TFLOPS

Radeon HD 4770

0.96 TFLOPS

Radeon HD 6990

VS

Radeon HD 4770

Graphics Card

Mar 2011

Release Date

Apr 2009

Northern Islands

Generation

Radeon R700

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

Base Clock

-

Boost Clock

-

1250 MHz

Memory Clock

800 MHz

Memory

2GB

Memory Size

512MB

GDDR5

Memory Type

GDDR5

256bit

Memory Bus

128bit

160.0GB/s

Bandwidth

51.20GB/s

Render Config

-

SM Count

-

24

Compute Units

8

1536

Shading Units

640

96

TMUs

32

ROPs

16

-

Tensor Cores

-

RT Cores

-

8 KB (per CU)

L1 Cache

16 KB (per CU)

512 KB

L2 Cache

128 KB

Theoretical Performance

26.56 GPixel/s

Pixel Rate

12.00 GPixel/s

79.68 GTexel/s

Texture Rate

24.00 GTexel/s

-

FP16 (half)

-

2.550 TFLOPS

FP32 (float)

960.0 GFLOPS

637.4 GFLOPS

FP64 (double)

192.0 GFLOPS

Graphics Processor

Antilles

GPU Name

RV740

Antilles XT (215-0807027)

GPU Variant

RV740 XT (215-0727019)

TeraScale 3

Architecture

TeraScale

TSMC

Foundry

TSMC

40 nm

Process Size

40 nm

2.64 billion

Transistors

0.826 billion

389 mm²

Die Size

137 mm²

Board Design

375W

TDP

80W

750 W

Suggested PSU

250 W

1x DVI 4x mini-DisplayPort 1.2

Outputs

2x DVI 1x S-Video

2x 8-pin

Power Connectors

1x 6-pin

Graphics Features

11.2 (11_0)

DirectX

10.1 (10_1)

4.4

OpenGL

3.3

1.2

OpenCL

1.1

N/A

Vulkan

N/A

-

CUDA

-

5.0

Shader Model

4.1

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