NVIDIA GeForce GTX 645 OEM vs AMD Radeon Sky 900

VS

NVIDIA GeForce GTX 645 OEM

AMD Radeon Sky 900

We compared two Desktop platform GPUs: 1024MB VRAM GeForce GTX 645 OEM and 3GB VRAM Radeon Sky 900 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

NVIDIA GeForce GTX 645 OEM 's Advantages

Lower TDP (65W vs 300W)

AMD Radeon Sky 900 's Advantages

Boost Clock950MHz

More VRAM (3GB vs 1024GB)

Larger VRAM bandwidth (240.0GB/s vs 64.00GB/s)

1216 additional rendering cores

Score

Benchmark

FP32 (float)

GeForce GTX 645 OEM

0.949 TFLOPS

Radeon Sky 900 +258%

3.405 TFLOPS

GeForce GTX 645 OEM

VS

Radeon Sky 900

Graphics Card

Apr 2013

Release Date

Mar 2013

GeForce 600

Generation

Radeon Sky

Desktop

Type

Desktop

PCIe 3.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

Base Clock

825 MHz

-

Boost Clock

950 MHz

1000 MHz

Memory Clock

1250 MHz

Memory

1024MB

Memory Size

3GB

GDDR5

Memory Type

GDDR5

128bit

Memory Bus

384bit

64.00GB/s

Bandwidth

240.0GB/s

Render Config

-

Compute Units

28

-

576

Shading Units

1792

48

TMUs

112

16

ROPs

32

-

16 KB (per SMX)

L1 Cache

16 KB (per CU)

256 KB

L2 Cache

768 KB

-

Theoretical Performance

9.888 GPixel/s

Pixel Rate

30.40 GPixel/s

39.55 GTexel/s

Texture Rate

106.4 GTexel/s

-

949.2 GFLOPS

FP32 (float)

3.405 TFLOPS

39.55 GFLOPS

FP64 (double)

851.2 GFLOPS

Board Design

65W

TDP

300W

250 W

Suggested PSU

700 W

1x DVI 1x HDMI 1.4a 1x DisplayPort 1.2

Outputs

1x DVI 1x mini-DisplayPort 1.2

None

Power Connectors

2x 8-pin

Graphics Processor

GK106

GPU Name

Tahiti

GK106-200-A1

GPU Variant

Orthrus

Kepler

Architecture

GCN 1.0

TSMC

Foundry

TSMC

28 nm

Process Size

28 nm

2.54 billion

Transistors

4.313 billion

221 mm²

Die Size

352 mm²

Graphics Features

12 (11_0)

DirectX

12 (11_1)

4.6

OpenGL

4.6

3.0

OpenCL

1.2

1.1

Vulkan

1.2

3.0

CUDA

-

5.1

Shader Model

5.1

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