NVIDIA GeForce GT 640 OEM Rebrand vs AMD Radeon HD 7770 GHz Edition

VS

NVIDIA GeForce GT 640 OEM Rebrand

AMD Radeon HD 7770 GHz Edition

We compared two Desktop platform GPUs: 1536MB VRAM GeForce GT 640 OEM Rebrand and 1024MB VRAM Radeon HD 7770 GHz Edition 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

More VRAM (1536GB vs 1024GB)

Lower TDP (75W vs 80W)

AMD Radeon HD 7770 GHz Edition 's Advantages

Larger VRAM bandwidth (72.00GB/s vs 38.40GB/s)

496 additional rendering cores

Score

Benchmark

FP32 (float)

GeForce GT 640 OEM Rebrand

0.415 TFLOPS

Radeon HD 7770 GHz Edition +208%

1.28 TFLOPS

GeForce GT 640 OEM Rebrand

VS

Radeon HD 7770 GHz Edition

Graphics Card

Apr 2012

Release Date

Feb 2012

GeForce 600

Generation

Southern Islands

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

800 MHz

Memory Clock

1125 MHz

Memory

1536MB

Memory Size

1024MB

DDR3

Memory Type

GDDR5

192bit

Memory Bus

128bit

38.40GB/s

Bandwidth

72.00GB/s

Render Config

-

Compute Units

10

3

SM Count

-

144

Shading Units

640

24

TMUs

40

24

ROPs

16

-

64 KB (per SM)

L1 Cache

16 KB (per CU)

384 KB

L2 Cache

256 KB

-

Theoretical Performance

4.320 GPixel/s

Pixel Rate

16.00 GPixel/s

17.28 GTexel/s

Texture Rate

40.00 GTexel/s

-

414.7 GFLOPS

FP32 (float)

1280 GFLOPS

34.56 GFLOPS

FP64 (double)

80.00 GFLOPS

Board Design

75W

TDP

80W

250 W

Suggested PSU

250 W

2x DVI 1x mini-HDMI 1.3a

Outputs

1x DVI 1x HDMI 1.4a 2x mini-DisplayPort 1.2

None

Power Connectors

1x 6-pin

Graphics Processor

GF116

GPU Name

Cape Verde

GF116-150-A1

GPU Variant

Cape Verde XT

Fermi 2.0

Architecture

GCN 1.0

TSMC

Foundry

TSMC

40 nm

Process Size

28 nm

1.17 billion

Transistors

1.5 billion

238 mm²

Die Size

123 mm²

Graphics Features

12 (11_0)

DirectX

12 (11_1)

4.6

OpenGL

4.6

1.1

OpenCL

1.2

N/A

Vulkan

1.2

2.1

CUDA

-

5.1

Shader Model

5.1

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