Buy the ARP T-Shirt! BIOS Optimization Guide Money Savers!

 07 March 2009
 Dr. Adrian Wong
 Discuss here !
Desktop Graphics Card Comparison Guide Rev. 33.0
Covering 628 desktop graphics cards, this comprehensive comparison allows you ... Read here
BIOS Option Of The Week - Virtualization Technology
Since 1999, we have been developing the BIOS Optimization Guide, affectionately known... Read here
Buy The BOG Book Subscribe To The BOG! Latest Money Savers!
An Inside Look Into The New Windows 7 Experience Index!
Digg! Reddit!Add to Reddit | Bookmark this article:

CPU Core Computations

For the processor tests, Microsoft associate level breaks with the expected performance for different levels of processors. For example, in Windows Vista, Microsft set three 'lines' for CPUs :

  • At about 850 MHz, a single-core AMD Athlon (K7) or Intel Pentium 4 corresponded to 2.0 and the score generally increased linearly with improved performance through 4.7.
  • Mainstream dual-core performance begins at 4.8.
  • In Windows Vista, the CPU scale was adjusted so the high-end dual-core parts received about a 5.8.

The current Windows 7 CPU assessments support up to 8 cores and can go to 16 cores without any changes. The current synthetic processor assessments are sufficient to assess the performance of 8-core systems with symmetric multi-threading. The Windows 7 CPU scoring rules are straightforward :

  • Systems with performance equivalent to that expected for a CPU with one or two physical cores can get a maximum score of 5.9.
  • 6.0 to 6.5 represents performance equivalent to that expected from high-end dual-core CUs that were ‘capping out’ at 5.9 in Windows Vista.
  • 6.3 to 6.9 is equivalent to to well-performing triple-core parts. Microsoft set the 6.9 point to be just under the performance expected for well-performing quad-core processors.
  • 7.0+ has been set to the performance level of mainstream quad-core processors.
  • Microsoft set 7.9 at the inferred performance of eight-core processor with SMT.

Note that this overlapping in the ranges is intentional. Scoring is not tied to the number of cores present, but rather to the level of performance. For example, it is possible for some dual-core processors to outscore some triple-core processors.


Addition Of A Single-Threaded CPU Assessment

For the WinEI formal assessment in Windows Vista, the four WinEI CPU assessments ran in a multi-threaded manner – one “measurement thread” per CPU. In addition, these assessments have always supported running in single-threaded mode.

In Windows 7, Microsoft added a run of the these assessments in single-threaded mode to the set of formal assessments. This lets the model account for the way processors scale in both a multi-core and single core manner.

This has been implemented as a scaling factor applied to the overall CPU score. This scaling factor is computed by taking the geometric mean of the four single-threaded CPU assesment metrics (not scores) and computing a value between 1.0 and 0.7. The CPU score is then multiplied by the scaling factor. The resulting value becomes the top level CPU score for the system. This scaling factor is never greater than 1.0 and never less than 0.7.

In Windows 7, 1.0 corresponds to a value of 80.00 MB/s and 0.7 corresponds to a value of 20.83 MB/s. This scaling factor is computed using a simple linear conversion as follows.


Support Tech ARP!

If you like our work, you can help support out work by visiting our sponsors, participate in the Tech ARP Forums, or even donate to our fund. Any help you can render is greatly appreciated!




What Is The Windows Experience Index?


How Is The New Scoring System Similar To That Of Windows Vista?
So What's Changed In Windows 7?


Will My System Get The Same Score From Windows 7 As Windows Vista?
Memory Performance & Size


CPU Core Computations
Addition Of A Single-Threaded CPU Assessment


How Does The CPU Score Correlate With User Experience?


Storage System Performance


Write Flush Policy Tests
Assessing Enhanced Storage Systems


Storage Test FAQs


Storage Test FAQs (Continued)


DX10 Gaming
DX10 Scoring Rules


Items Under Investigation
DX10 & WDDM 1.1 Drivers
DX10 Graphics For DWM


High Definition Video Playback


What's Not Tested?
Features & Concepts No Longer Included
Other Microsoft Scoops

Western Digital VelociRaptor 600 GB Hard Disk Drive Review
How To Migrate Apple iTunes From One Computer To Another
ASUS ENGTX280 TOP GeForce GTX 280 Graphics Card Review
ASUS P6T Deluxe X58 Express Motherboard (OC Palm Edition) Review Rev. 1.1
Western Digital 320 GB Scorpio Notebook Hard Drive Review
Newbie's Guide To Overclocking
SteelPad 5L Mouse Pad Review
ASUS S-presso SFF System Review
BFG GeForce 6800 GT OC Graphics Card Review
SimpleTech PC4000 Nitro Dual-Channel Kit Review


Copyright © Tech All rights reserved.