NVIDIA GeForce GT 645 OEM vs AMD Radeon HD 7970 X2

VS

NVIDIA GeForce GT 645 OEM

AMD Radeon HD 7970 X2

We compared two Desktop platform GPUs: 1024MB VRAM GeForce GT 645 OEM and 3GB VRAM Radeon HD 7970 X2 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

NVIDIA GeForce GT 645 OEM 's Advantages

Lower TDP (102W vs 500W)

AMD Radeon HD 7970 X2 's Advantages

More VRAM (3GB vs 1024GB)

Larger VRAM bandwidth (264.0GB/s vs 91.87GB/s)

1760 additional rendering cores

Score

Benchmark

FP32 (float)

GeForce GT 645 OEM

0.894 TFLOPS

Radeon HD 7970 X2 +323%

3.789 TFLOPS

GeForce GT 645 OEM

VS

Radeon HD 7970 X2

Graphics Card

Apr 2012

Release Date

Aug 2012

GeForce 600

Generation

Southern Islands

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

957 MHz

Memory Clock

1375 MHz

Memory

1024MB

Memory Size

3GB

GDDR5

Memory Type

GDDR5

192bit

Memory Bus

384bit

91.87GB/s

Bandwidth

264.0GB/s

Render Config

-

Compute Units

32

6

SM Count

-

288

Shading Units

2048

48

TMUs

128

24

ROPs

32

-

64 KB (per SM)

L1 Cache

16 KB (per CU)

384 KB

L2 Cache

768 KB

-

Theoretical Performance

9.312 GPixel/s

Pixel Rate

29.60 GPixel/s

37.25 GTexel/s

Texture Rate

118.4 GTexel/s

-

894.0 GFLOPS

FP32 (float)

3.789 TFLOPS

74.50 GFLOPS

FP64 (double)

947.2 GFLOPS

Board Design

102W

TDP

500W

300 W

Suggested PSU

900 W

2x DVI 1x mini-HDMI 1.3a

Outputs

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

-

Power Connectors

3x 8-pin

Graphics Processor

GF114

GPU Name

New Zealand

-

Fermi 2.0

Architecture

GCN 1.0

TSMC

Foundry

TSMC

40 nm

Process Size

28 nm

1.95 billion

Transistors

4.313 billion

332 mm²

Die Size

352 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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