NVIDIA GeForce GT 640 OEM Rebrand vs ATI Radeon HD 3870 X2

VS

NVIDIA GeForce GT 640 OEM Rebrand

ATI Radeon HD 3870 X2

We compared two Desktop platform GPUs: 1536MB VRAM GeForce GT 640 OEM Rebrand and 512MB VRAM Radeon HD 3870 X2 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

NVIDIA GeForce GT 640 OEM Rebrand 's Advantages

Released 4 years and 3 months late

More VRAM (1536GB vs 512GB)

Lower TDP (75W vs 165W)

ATI Radeon HD 3870 X2 's Advantages

Larger VRAM bandwidth (57.66GB/s vs 38.40GB/s)

176 additional rendering cores

Score

Benchmark

FP32 (float)

GeForce GT 640 OEM Rebrand

0.415 TFLOPS

Radeon HD 3870 X2 +27%

0.528 TFLOPS

GeForce GT 640 OEM Rebrand

VS

Radeon HD 3870 X2

Graphics Card

Apr 2012

Release Date

Jan 2008

GeForce 600

Generation

Radeon R600

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 2.0 x16

Clock Speeds

-

800 MHz

Memory Clock

901 MHz

Memory

1536MB

Memory Size

512MB

DDR3

Memory Type

GDDR3

192bit

Memory Bus

256bit

38.40GB/s

Bandwidth

57.66GB/s

Render Config

-

Compute Units

4

3

SM Count

-

144

Shading Units

320

24

TMUs

16

24

ROPs

16

-

64 KB (per SM)

L1 Cache

-

384 KB

L2 Cache

256 KB

-

Theoretical Performance

4.320 GPixel/s

Pixel Rate

13.20 GPixel/s

17.28 GTexel/s

Texture Rate

13.20 GTexel/s

-

414.7 GFLOPS

FP32 (float)

528.0 GFLOPS

34.56 GFLOPS

FP64 (double)

105.6 GFLOPS

Board Design

75W

TDP

165W

250 W

Suggested PSU

450 W

2x DVI 1x mini-HDMI 1.3a

Outputs

2x DVI 1x S-Video

None

Power Connectors

1x 6-pin + 1x 8-pin

Graphics Processor

GF116

GPU Name

R680

GF116-150-A1

GPU Variant

R680 XT (215-0708017)

Fermi 2.0

Architecture

TeraScale

TSMC

Foundry

TSMC

40 nm

Process Size

55 nm

1.17 billion

Transistors

0.666 billion

238 mm²

Die Size

192 mm²

Graphics Features

12 (11_0)

DirectX

10.1 (10_1)

4.6

OpenGL

3.3 (full) 4.0 (partial)

1.1

OpenCL

N/A

Vulkan

N/A

2.1

CUDA

-

5.1

Shader Model

4.1

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