NVIDIA GeForce GT 645 OEM vs AMD Radeon Sky 500

VS

NVIDIA GeForce GT 645 OEM

AMD Radeon Sky 500

We compared two Desktop platform GPUs: 1024MB VRAM GeForce GT 645 OEM and 4GB VRAM Radeon Sky 500 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 150W)

AMD Radeon Sky 500 's Advantages

Released 11 months late

More VRAM (4GB vs 1024GB)

Larger VRAM bandwidth (153.6GB/s vs 91.87GB/s)

992 additional rendering cores

Score

Benchmark

FP32 (float)

GeForce GT 645 OEM

0.894 TFLOPS

Radeon Sky 500 +172%

2.432 TFLOPS

GeForce GT 645 OEM

VS

Radeon Sky 500

Graphics Card

Apr 2012

Release Date

Mar 2013

GeForce 600

Generation

Radeon Sky

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

957 MHz

Memory Clock

1200 MHz

Memory

1024MB

Memory Size

4GB

GDDR5

Memory Type

GDDR5

192bit

Memory Bus

256bit

91.87GB/s

Bandwidth

153.6GB/s

Render Config

-

Compute Units

20

6

SM Count

-

288

Shading Units

1280

48

TMUs

80

24

ROPs

32

-

64 KB (per SM)

L1 Cache

16 KB (per CU)

384 KB

L2 Cache

512 KB

-

Theoretical Performance

9.312 GPixel/s

Pixel Rate

30.40 GPixel/s

37.25 GTexel/s

Texture Rate

76.00 GTexel/s

-

894.0 GFLOPS

FP32 (float)

2.432 TFLOPS

74.50 GFLOPS

FP64 (double)

152.0 GFLOPS

Board Design

102W

TDP

150W

300 W

Suggested PSU

450 W

2x DVI 1x mini-HDMI 1.3a

Outputs

1x DisplayPort 1.2

-

Power Connectors

1x 6-pin

Graphics Processor

GF114

GPU Name

Pitcairn

-

GPU Variant

Pitcairn XT GL (215-0828073)

Fermi 2.0

Architecture

GCN 1.0

TSMC

Foundry

TSMC

40 nm

Process Size

28 nm

1.95 billion

Transistors

2.8 billion

332 mm²

Die Size

212 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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