NVIDIA GeForce GT 645 OEM vs NVIDIA GeForce 8800 Ultra

VS

NVIDIA GeForce GT 645 OEM

NVIDIA GeForce 8800 Ultra

We compared two Desktop platform GPUs: 1024MB VRAM GeForce GT 645 OEM and 768MB VRAM GeForce 8800 Ultra to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

NVIDIA GeForce GT 645 OEM 's Advantages

Released 4 years and 11 months late

More VRAM (1024GB vs 768GB)

160 additional rendering cores

Lower TDP (102W vs 171W)

NVIDIA GeForce 8800 Ultra 's Advantages

Larger VRAM bandwidth (103.7GB/s vs 91.87GB/s)

Score

Benchmark

FP32 (float)

GeForce GT 645 OEM +131%

0.894 TFLOPS

GeForce 8800 Ultra

0.387 TFLOPS

GeForce GT 645 OEM

VS

GeForce 8800 Ultra

Graphics Card

Apr 2012

Release Date

May 2007

GeForce 600

Generation

GeForce 8

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 1.0 x16

Clock Speeds

-

957 MHz

Memory Clock

1080 MHz

Memory

1024MB

Memory Size

768MB

GDDR5

Memory Type

GDDR3

192bit

Memory Bus

384bit

91.87GB/s

Bandwidth

103.7GB/s

Render Config

-

6

SM Count

16

288

Shading Units

128

48

TMUs

32

24

ROPs

24

-

64 KB (per SM)

L1 Cache

-

384 KB

L2 Cache

96 KB

-

Theoretical Performance

9.312 GPixel/s

Pixel Rate

14.69 GPixel/s

37.25 GTexel/s

Texture Rate

39.17 GTexel/s

-

894.0 GFLOPS

FP32 (float)

387.1 GFLOPS

74.50 GFLOPS

FP64 (double)

-

Board Design

102W

TDP

171W

300 W

Suggested PSU

450 W

2x DVI 1x mini-HDMI 1.3a

Outputs

2x DVI 1x S-Video

-

Power Connectors

2x 6-pin

Graphics Processor

GF114

GPU Name

G80

-

GPU Variant

G80-450-A3

Fermi 2.0

Architecture

Tesla

TSMC

Foundry

TSMC

40 nm

Process Size

90 nm

1.95 billion

Transistors

0.681 billion

332 mm²

Die Size

484 mm²

Graphics Features

12 (11_0)

DirectX

11.1 (10_0)

4.6

OpenGL

3.3

1.1

OpenCL

1.1 (1.0)

N/A

Vulkan

N/A

2.1

CUDA

1.0

5.1

Shader Model

4.0

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