AMD Radeon HD 6990 vs NVIDIA GeForce GT 640 Rev. 2

VS

AMD Radeon HD 6990

NVIDIA GeForce GT 640 Rev. 2

We compared two Desktop platform GPUs: 2GB VRAM Radeon HD 6990 and 1024MB VRAM GeForce GT 640 Rev. 2 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 40.06GB/s)

1152 additional rendering cores

NVIDIA GeForce GT 640 Rev. 2 's Advantages

Released 2 years and 2 months late

Lower TDP (49W vs 375W)

Score

Benchmark

FP32 (float)

Radeon HD 6990 +217%

2.55 TFLOPS

GeForce GT 640 Rev. 2

0.803 TFLOPS

Radeon HD 6990

VS

GeForce GT 640 Rev. 2

Graphics Card

Mar 2011

Release Date

May 2013

Northern Islands

Generation

GeForce 600

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 2.0 x8

Clock Speeds

-

1250 MHz

Memory Clock

1252 MHz

Memory

2GB

Memory Size

1024MB

GDDR5

Memory Type

GDDR5

256bit

Memory Bus

64bit

160.0GB/s

Bandwidth

40.06GB/s

Render Config

24

Compute Units

-

1536

Shading Units

384

96

TMUs

32

ROPs

8

-

8 KB (per CU)

L1 Cache

16 KB (per SMX)

512 KB

L2 Cache

512 KB

-

Theoretical Performance

26.56 GPixel/s

Pixel Rate

8.368 GPixel/s

79.68 GTexel/s

Texture Rate

33.47 GTexel/s

-

2.550 TFLOPS

FP32 (float)

803.3 GFLOPS

637.4 GFLOPS

FP64 (double)

33.47 GFLOPS

Board Design

375W

TDP

49W

750 W

Suggested PSU

200 W

1x DVI 4x mini-DisplayPort 1.2

Outputs

1x DVI 1x HDMI 1.4a 1x VGA

2x 8-pin

Power Connectors

None

Graphics Processor

Antilles

GPU Name

GK208

Antilles XT (215-0807027)

GPU Variant

GK208-400-A1

TeraScale 3

Architecture

Kepler 2.0

TSMC

Foundry

TSMC

40 nm

Process Size

28 nm

2.64 billion

Transistors

1.02 billion

389 mm²

Die Size

87 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

3.5

5.0

Shader Model

5.1

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