NVIDIA GeForce GT 645 OEM vs AMD Radeon R9 255 OEM

VS

NVIDIA GeForce GT 645 OEM

AMD Radeon R9 255 OEM

We compared two Desktop platform GPUs: 1024MB VRAM GeForce GT 645 OEM and 2GB VRAM Radeon R9 255 OEM to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

NVIDIA GeForce GT 645 OEM 's Advantages

Larger VRAM bandwidth (91.87GB/s vs 73.60GB/s)

AMD Radeon R9 255 OEM 's Advantages

Released 1 years and 8 months late

Boost Clock930MHz

More VRAM (2GB vs 1024GB)

224 additional rendering cores

Lower TDP (65W vs 102W)

Score

Benchmark

FP32 (float)

GeForce GT 645 OEM

0.894 TFLOPS

Radeon R9 255 OEM +6%

0.952 TFLOPS

GeForce GT 645 OEM

VS

Radeon R9 255 OEM

Graphics Card

Apr 2012

Release Date

Dec 2013

GeForce 600

Generation

Volcanic Islands

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 3.0 x16

Clock Speeds

-

Base Clock

900 MHz

-

Boost Clock

930 MHz

957 MHz

Memory Clock

1150 MHz

Memory

1024MB

Memory Size

2GB

GDDR5

Memory Type

GDDR5

192bit

Memory Bus

128bit

91.87GB/s

Bandwidth

73.60GB/s

Render Config

-

Compute Units

8

6

SM Count

-

288

Shading Units

512

48

TMUs

32

24

ROPs

16

-

64 KB (per SM)

L1 Cache

16 KB (per CU)

384 KB

L2 Cache

256 KB

-

Theoretical Performance

9.312 GPixel/s

Pixel Rate

14.88 GPixel/s

37.25 GTexel/s

Texture Rate

29.76 GTexel/s

-

894.0 GFLOPS

FP32 (float)

952.3 GFLOPS

74.50 GFLOPS

FP64 (double)

59.52 GFLOPS

Board Design

102W

TDP

65W

300 W

Suggested PSU

250 W

2x DVI 1x mini-HDMI 1.3a

Outputs

No outputs

-

Power Connectors

1x 6-pin

Graphics Processor

GF114

GPU Name

Cape Verde

-

GPU Variant

Cape Verde PRX

Fermi 2.0

Architecture

GCN 1.0

TSMC

Foundry

TSMC

40 nm

Process Size

28 nm

1.95 billion

Transistors

1.5 billion

332 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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