NVIDIA GeForce GT 640 vs ATI Radeon HD 4890

VS

NVIDIA GeForce GT 640

ATI Radeon HD 4890

We compared two Desktop platform GPUs: 2GB VRAM GeForce GT 640 and 1024MB VRAM Radeon HD 4890 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

NVIDIA GeForce GT 640 's Advantages

Released 3 years and 2 months late

More VRAM (2GB vs 1024GB)

Lower TDP (65W vs 190W)

ATI Radeon HD 4890 's Advantages

Larger VRAM bandwidth (124.8GB/s vs 28.51GB/s)

416 additional rendering cores

Score

Benchmark

FP32 (float)

GeForce GT 640

0.693 TFLOPS

Radeon HD 4890 +96%

1.36 TFLOPS

GeForce GT 640

VS

Radeon HD 4890

Graphics Card

Jun 2012

Release Date

Apr 2009

GeForce 600

Generation

Radeon R700

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

891 MHz

Memory Clock

975 MHz

Memory

2GB

Memory Size

1024MB

DDR3

Memory Type

GDDR5

128bit

Memory Bus

256bit

28.51GB/s

Bandwidth

124.8GB/s

Render Config

-

Compute Units

10

-

384

Shading Units

800

32

TMUs

40

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

13.60 GPixel/s

28.86 GTexel/s

Texture Rate

34.00 GTexel/s

-

692.7 GFLOPS

FP32 (float)

1360 GFLOPS

28.86 GFLOPS

FP64 (double)

272.0 GFLOPS

Board Design

65W

TDP

190W

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

2x 6-pin

Graphics Processor

GK107

GPU Name

RV790

GK107-300-A2

GPU Variant

RV790 XT (215-0758016)

Kepler

Architecture

TeraScale

TSMC

Foundry

TSMC

28 nm

Process Size

55 nm

1.27 billion

Transistors

0.959 billion

118 mm²

Die Size

282 mm²

Graphics Features

12 (11_0)

DirectX

10.1 (10_1)

4.6

OpenGL

3.3

3.0

OpenCL

1.1

Vulkan

N/A

3.0

CUDA

-

5.1

Shader Model

4.1

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