NVIDIA GeForce GT 645 OEM vs AMD Radeon HD 7950

VS

NVIDIA GeForce GT 645 OEM

AMD Radeon HD 7950

We compared two Desktop platform GPUs: 1024MB VRAM GeForce GT 645 OEM and 3GB VRAM Radeon HD 7950 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 200W)

AMD Radeon HD 7950 's Advantages

More VRAM (3GB vs 1024GB)

Larger VRAM bandwidth (240.0GB/s vs 91.87GB/s)

1504 additional rendering cores

Score

Benchmark

FP32 (float)

GeForce GT 645 OEM

0.894 TFLOPS

Radeon HD 7950 +220%

2.867 TFLOPS

GeForce GT 645 OEM

VS

Radeon HD 7950

Graphics Card

Apr 2012

Release Date

Jan 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

1250 MHz

Memory

1024MB

Memory Size

3GB

GDDR5

Memory Type

GDDR5

192bit

Memory Bus

384bit

91.87GB/s

Bandwidth

240.0GB/s

Render Config

-

Compute Units

28

6

SM Count

-

288

Shading Units

1792

48

TMUs

112

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

25.60 GPixel/s

37.25 GTexel/s

Texture Rate

89.60 GTexel/s

-

894.0 GFLOPS

FP32 (float)

2.867 TFLOPS

74.50 GFLOPS

FP64 (double)

716.8 GFLOPS

Board Design

102W

TDP

200W

300 W

Suggested PSU

550 W

2x DVI 1x mini-HDMI 1.3a

Outputs

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

-

Power Connectors

2x 6-pin

Graphics Processor

GF114

GPU Name

Tahiti

-

GPU Variant

Tahiti PRO (215-0821056)

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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