NVIDIA GeForce GT 640 vs AMD Radeon HD 6850 X2

VS

NVIDIA GeForce GT 640

AMD Radeon HD 6850 X2

We compared two Desktop platform GPUs: 2GB VRAM GeForce GT 640 and 2GB VRAM Radeon HD 6850 X2 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

NVIDIA GeForce GT 640 's Advantages

Released 9 months late

Lower TDP (65W vs 254W)

AMD Radeon HD 6850 X2 's Advantages

Larger VRAM bandwidth (134.4GB/s vs 28.51GB/s)

576 additional rendering cores

Score

Benchmark

FP32 (float)

GeForce GT 640

0.693 TFLOPS

Radeon HD 6850 X2 +121%

1.536 TFLOPS

GeForce GT 640

VS

Radeon HD 6850 X2

Graphics Card

Jun 2012

Release Date

Sep 2011

GeForce 600

Generation

Northern Islands

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

891 MHz

Memory Clock

1050 MHz

Memory

2GB

Memory Size

2GB

DDR3

Memory Type

GDDR5

128bit

Memory Bus

256bit

28.51GB/s

Bandwidth

134.4GB/s

Render Config

-

Compute Units

12

-

384

Shading Units

960

32

TMUs

48

16

ROPs

32

-

16 KB (per SMX)

L1 Cache

8 KB (per CU)

256 KB

L2 Cache

512 KB

-

Theoretical Performance

7.216 GPixel/s

Pixel Rate

25.60 GPixel/s

28.86 GTexel/s

Texture Rate

38.40 GTexel/s

-

692.7 GFLOPS

FP32 (float)

1.536 TFLOPS

28.86 GFLOPS

FP64 (double)

-

Board Design

65W

TDP

254W

250 W

Suggested PSU

600 W

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

Outputs

2x DVI 1x HDMI 1.3a 1x DisplayPort 1.1

None

Power Connectors

2x 8-pin

Graphics Processor

GK107

GPU Name

Barts

GK107-300-A2

GPU Variant

Barts PRO (215-0798006)

Kepler

Architecture

TeraScale 2

TSMC

Foundry

TSMC

28 nm

Process Size

40 nm

1.27 billion

Transistors

1.7 billion

118 mm²

Die Size

255 mm²

Graphics Features

12 (11_0)

DirectX

11.2 (11_0)

4.6

OpenGL

4.4

3.0

OpenCL

1.2

1.1

Vulkan

N/A

3.0

CUDA

-

5.1

Shader Model

5.0

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