NVIDIA GeForce GT 640 vs AMD Radeon R9 255 OEM

VS

NVIDIA GeForce GT 640

AMD Radeon R9 255 OEM

We compared two Desktop platform GPUs: 2GB VRAM GeForce GT 640 and 2GB VRAM Radeon R9 255 OEM to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

AMD Radeon R9 255 OEM 's Advantages

Released 1 years and 6 months late

Boost Clock930MHz

Larger VRAM bandwidth (73.60GB/s vs 28.51GB/s)

128 additional rendering cores

Score

Benchmark

FP32 (float)

GeForce GT 640

0.693 TFLOPS

Radeon R9 255 OEM +37%

0.952 TFLOPS

GeForce GT 640

VS

Radeon R9 255 OEM

Graphics Card

Jun 2012

Release Date

Dec 2013

GeForce 600

Generation

Volcanic Islands

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

Base Clock

900 MHz

-

Boost Clock

930 MHz

891 MHz

Memory Clock

1150 MHz

Memory

2GB

Memory Size

2GB

DDR3

Memory Type

GDDR5

128bit

Memory Bus

128bit

28.51GB/s

Bandwidth

73.60GB/s

Render Config

-

Compute Units

8

-

384

Shading Units

512

32

TMUs

32

16

ROPs

16

-

16 KB (per SMX)

L1 Cache

16 KB (per CU)

256 KB

L2 Cache

256 KB

-

Theoretical Performance

7.216 GPixel/s

Pixel Rate

14.88 GPixel/s

28.86 GTexel/s

Texture Rate

29.76 GTexel/s

-

692.7 GFLOPS

FP32 (float)

952.3 GFLOPS

28.86 GFLOPS

FP64 (double)

59.52 GFLOPS

Board Design

65W

TDP

65W

250 W

Suggested PSU

250 W

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

Outputs

No outputs

None

Power Connectors

1x 6-pin

Graphics Processor

GK107

GPU Name

Cape Verde

GK107-300-A2

GPU Variant

Cape Verde PRX

Kepler

Architecture

GCN 1.0

TSMC

Foundry

TSMC

28 nm

Process Size

28 nm

1.27 billion

Transistors

1.5 billion

118 mm²

Die Size

123 mm²

Graphics Features

12 (11_0)

DirectX

12 (11_1)

4.6

OpenGL

4.6

3.0

OpenCL

1.2

1.1

Vulkan

1.2

3.0

CUDA

-

5.1

Shader Model

5.1

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