AMD Radeon HD 6990 vs NVIDIA GeForce GTX 660 OEM

VS

AMD Radeon HD 6990

NVIDIA GeForce GTX 660 OEM

We compared two Desktop platform GPUs: 2GB VRAM Radeon HD 6990 and 1536MB VRAM GeForce GTX 660 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 1536GB)

Larger VRAM bandwidth (160.0GB/s vs 134.4GB/s)

384 additional rendering cores

NVIDIA GeForce GTX 660 OEM 's Advantages

Released 1 years and 5 months late

Boost Clock888MHz

Lower TDP (130W vs 375W)

Score

Benchmark

FP32 (float)

Radeon HD 6990 +24%

2.55 TFLOPS

GeForce GTX 660 OEM

2.046 TFLOPS

Radeon HD 6990

VS

GeForce GTX 660 OEM

Graphics Card

Mar 2011

Release Date

Aug 2012

Northern Islands

Generation

GeForce 600

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

Base Clock

823 MHz

-

Boost Clock

888 MHz

1250 MHz

Memory Clock

1400 MHz

Memory

2GB

Memory Size

1536MB

GDDR5

Memory Type

GDDR5

256bit

Memory Bus

192bit

160.0GB/s

Bandwidth

134.4GB/s

Render Config

24

Compute Units

-

1536

Shading Units

1152

96

TMUs

96

32

ROPs

24

-

8 KB (per CU)

L1 Cache

16 KB (per SMX)

512 KB

L2 Cache

384 KB

-

Theoretical Performance

26.56 GPixel/s

Pixel Rate

21.31 GPixel/s

79.68 GTexel/s

Texture Rate

85.25 GTexel/s

-

2.550 TFLOPS

FP32 (float)

2.046 TFLOPS

637.4 GFLOPS

FP64 (double)

85.25 GFLOPS

Board Design

375W

TDP

130W

750 W

Suggested PSU

300 W

1x DVI 4x mini-DisplayPort 1.2

Outputs

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

2x 8-pin

Power Connectors

1x 6-pin

Graphics Processor

Antilles

GPU Name

GK104

Antilles XT (215-0807027)

GPU Variant

GK104-200-KD-A2

TeraScale 3

Architecture

Kepler

TSMC

Foundry

TSMC

40 nm

Process Size

28 nm

2.64 billion

Transistors

3.54 billion

389 mm²

Die Size

294 mm²

Graphics Features

11.2 (11_0)

DirectX

12 (11_0)

4.4

OpenGL

4.6

1.2

OpenCL

3.0

N/A

Vulkan

1.1

-

CUDA

3.0

5.0

Shader Model

5.1

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