NVIDIA GeForce GT 640 vs ATI Radeon HD 2900 GT

VS

NVIDIA GeForce GT 640

ATI Radeon HD 2900 GT

We compared two Desktop platform GPUs: 2GB VRAM GeForce GT 640 and 256MB VRAM Radeon HD 2900 GT to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

NVIDIA GeForce GT 640 's Advantages

Released 4 years and 7 months late

More VRAM (2GB vs 256GB)

144 additional rendering cores

Lower TDP (65W vs 150W)

ATI Radeon HD 2900 GT 's Advantages

Larger VRAM bandwidth (51.20GB/s vs 28.51GB/s)

Score

Benchmark

FP32 (float)

GeForce GT 640 +140%

0.693 TFLOPS

Radeon HD 2900 GT

0.288 TFLOPS

GeForce GT 640

VS

Radeon HD 2900 GT

Graphics Card

Jun 2012

Release Date

Nov 2007

GeForce 600

Generation

Radeon R600

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 1.0 x16

Clock Speeds

-

891 MHz

Memory Clock

800 MHz

Memory

2GB

Memory Size

256MB

DDR3

Memory Type

GDDR3

128bit

Memory Bus

256bit

28.51GB/s

Bandwidth

51.20GB/s

Render Config

-

Compute Units

3

-

384

Shading Units

240

32

TMUs

12

16

ROPs

12

-

16 KB (per SMX)

L1 Cache

-

256 KB

L2 Cache

128 KB

-

Theoretical Performance

7.216 GPixel/s

Pixel Rate

7.212 GPixel/s

28.86 GTexel/s

Texture Rate

7.212 GTexel/s

-

692.7 GFLOPS

FP32 (float)

288.5 GFLOPS

28.86 GFLOPS

FP64 (double)

-

Board Design

65W

TDP

150W

250 W

Suggested PSU

450 W

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

Outputs

2x DVI 1x S-Video

None

Power Connectors

1x 8-pin

Graphics Processor

GK107

GPU Name

R600

GK107-300-A2

GPU Variant

R600 GT (215RGFDKA13FG)

Kepler

Architecture

TeraScale

TSMC

Foundry

TSMC

28 nm

Process Size

80 nm

1.27 billion

Transistors

0.72 billion

118 mm²

Die Size

420 mm²

Graphics Features

12 (11_0)

DirectX

10.0 (10_0)

4.6

OpenGL

3.3 (full) 4.0 (partial)

3.0

OpenCL

N/A

1.1

Vulkan

N/A

3.0

CUDA

-

5.1

Shader Model

4.0

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