Source principale : windowsvistablog

WEI : The Windows® Experience Index

is a new feature built into Windows Vista™. It is designed to help consumers understand how well Windows Vista and the software running on it will perform on a specific PC. The index achieves this by assessing the capability of the PC and assigning a score to it. Higher scores indicate a better Vista experience on your PC.

 

Non Vista Capable

Pentium III - 650 MHz, de mars 2000 (AGP GeForce2 GTS 64 Mb DDR)

 

Processeur à 5.9

grâce à un Core2Quad 6600, de décembre 2007 (PCI-E GeForce 8500GT 256Mb DDR2)

 

 Graphiques à 5.9

grâce à une PCI-E XFX GeForce 8800GT 768 Mb DDR3, de janvier 2007 (Core2Duo 6700)

 

The overall PC performance is represented by the base score. The base score is derived from 5 subscores for each of the following 5 attributes:
• Processor : Calculations per second
• Memory : Operations per second
• Graphics : Desktop performance for Windows Aero graphics
• Gaming graphics : 3D graphics performance. Useful for gaming and 3D business applications
• Primary hard disk : The data transfer rate of the primary hard disk
 

Computing Each Subscore 

Each sub score in the index was created to measure the performance of a critical piece of hardware. The scores are calculated by measuring one or more relevant performance attributes, and then converting the values (normalizing) to a score between 1.0 and 5.9.

 

The CPU SubScore

The CPU score was created to measure the processor performance when tasked with common Windows usage activities. The processor is assessed on the following items :

1.      Compression and decompression using the LZW compression algorithm

2.      Compression and decompression using the Windows Vista compression algorithm used for hibernation files, ReadyBoost and other features

3.      Encryption and decryption assessment

4.      Computing hashes

5.      Encoding of video

The results are normalized and weight averaged in order to arrive at the final CPU sub score.

 

The Memory SubScore

The memory score measures the bandwidth of moving data into and out of memory in Mega Bytes per Second. The higher the bandwidth, the better the memory. 

Not having enough memory is a limiting factor on performance. As a result, the amount of memory in the system constrains the score value. The amount of system memory is determined by the overall system memory minus any memory reserved for graphics (if any).

 The amount of memory limits are:

 

Amount of memory

Highest possible score

Less than 256 MB

1.0

Less than 500 MB

2.0

512 MB or less

2.9

Less than 704 MB

3.5

Less than 960 MB

3.9

Less than 1.5 GB

4.5

 

The Graphics SubScore

This score is intended to reflect how a system will run Aero (desktop composition) and playback Windows Media Video. It measures video memory bandwidth (in mega bytes per second) and converts it to a score between 1.0 and 5.9.

If the graphics hardware does not support DirectX 9 (DX9) graphics, then the system receives a graphics score of 1.0 regardless of driver type. If the system supports DX9, but does not have a WDDM Driver (Windows Vista Display Driver Model) the system will then receive a graphics score of 1.9 at the most.

 

The Gaming SubScore

The gaming score measures the frames per second the graphics card can handle for various textures.

Additional notes:

·        If the graphics card does not support D3D 9 then it receives a Gaming score of 1.0.

·        If D3D 9 is supported, the card is DX9 capable and has a WDDM driver, it will score at least 2.0.

·        If the score is greater than or equal to 5.0 and the graphics sub-system does not support Pixel Shader 3.0 then the score is limited to 4.9

 

The Disk SubScore

The disk score measures disk bandwidth (in Mega Bytes per Second). The conversion to an index number is set up in a way that all modern disks will score at least 2.0.

C'est donc sur le Sous-Indice "Processeur" que l'on doit mesurer l'effet du ReadyBoost

 

Test sur un Pentium 4 équipé de 1,5 Gb de DDR

 

DIMM1: Kingston K 1 Gb PC3200 DDR (3.0-3-3-8 @ 200 MHz) (2.5-3-3-7 @ 166 MHz)
DIMM2: Kingston K 512 Mb PC3200 DDR (3.0-3-3-8 @ 200 MHz) (2.5-3-3-7 @ 166 MHz) (2.0-2-2-6 @ 133 MHz)

Intel Pentium 4, 2000 MHz (55 millions de transistors) on ECS P4VXASD2 - AGP4X : ATI Rage128 Fury Pro - HD : ExcelStor J680 (80 Gb, 7200 RPM, Ultra-ATA/100)


Valeur de base :

Avec une clé USB2 Toshiba de 2 Gb :

 

Avec une clé USB2 TransMemory Toshiba de 4 Gb :

 

La démonstration reste à faire !