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CPUSpy - CPUID and Cache Test Utility

Version 1.04351 KB Download / 150 KB Installed
19 Aug 05

2K / XP

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CPUSpy - CPUID Database & System Information

Version 1.043
18 Jun 05

Written by Andrew Josef Glina for Sinner Computing using MASM32 assembly language.


Program Info

Most x86 processors support the CPUID instruction which returns data describing the make and model of the CPU. Later processors also support extended features such as cache details, processor features, design speed and processor name. CPUSpy interrogates your processor and displays this data (if supported) in a easy to read tabbed format. L1, L2 and L3 cache data is fully broken down as are the processor flags. In addition, CPUSpy can also check your current CPU speed in MHz, Windows Up-Time, IP address, Window Version and memory status. CPUSpy even can run a test on your cache memory to provide an easy comparison between various processors or system configurations.

CPUSpy also has an internal database of many common CPUs, supporting most AMD (tm), Intel (tm) and Transmeta (tm) processors. This can be used to compare between processors features such as bus speed, maximum frequency, cache sizes, release dates, codename, and transistor count. Interesting facts are also included for most major models. A OS database is also included for comparing past current and future versions of Windows as well as information on you computers drives.

Processor data can be saved in a HTML report file providing an easy way to extract data from a PC and analyse it later.

Tested on



Run "Setup.exe" and follow the instructions. To remove CPUSpy, use the "Add/Remove Programs" option in the Control Panel.


CPUSpy upon loading will automatically display your processor type if it is in the database. (If it is not known, then the CPUID numbers only will be shown. If this is the case then please EMail me your report and I will add it to the database straight away.) A few seconds later (3 being the default) CPUSpy will display the approximate frequency that you CPU's core is running at. (Time is needed to count the number of clock cycles, with 3 seconds generally being enough for a accurate number.) What you do next depends on what you want.

N.B. This ReadMe is not intended to explain in full detail what actual results mean. It would take too much space and would probably break several copyright laws. If you want more detail then we recommend that you visit the CPU manufacturers site. All this file explains is use of the program itself.

Main Flags Cache Database OS Drives Settings / Help


The main window displays the core details of the processor.

Processor This is either the Brand String, the Brand ID text, or data from the internal database depending on what the processor supports.
Frequency This shows the calculated CPU Frequency. It can be continuously updated and its measuring time can be changed on the Settings / Help tab
Code Name This name, if known is extracted from the internal database and is the development name for the processor.
Vendor ID This text is stored in the processor itself and indicates what company made the CPU.
Type Type of processor. For most systems this will be "0" which means that it is a processor intended to be installed by a professional.
Family Major processor group
Model Minor processor group
Stepping Revision number
Brand ID Intel method for differentiating similar featured processors
Brand String This text is stored in the processor itself and indicates the company name for the CPU.
L1 Total L1 Data + L1 Instruction/Trace in KB
L1 Data Size in KB of L1 Data Cache
L1 Inst Size in KB of L1 Instruction/Trace Cache. Stores the predicted next instructions.
L2 Size in KB of L2 Cache. L2 cache forms a higher speed buffer between the CPU core and memory.
L3 Size in KB of L3 Cache (Most processors do not have L3 Cache)

Flags A & Flags B

Displayed on these pages are the feature flags of the processor. These indicates what features the processor has and what ones are enabled. The flags on page A (EDX) are supported by most processors in varying degrees, as are the first (ECX) group on page B. However, the extended flags are currently not supported by Intel processors, and probably will never be.

Cache (L1, L2 & L3)

These pages display detailed information about the make-up of the CPUs cache. They are displayed in the order that the processor reports it. Level 3 Cache data, if any, is prefixed with "L3" in the "Type" section. Pentium CPUs, among others, do not support Cache Data reporting, however, the CPU database will probably have the L1 data there.


This page provides the ability to manually look up a processor via its CPUID numbers, and also to compare various processors. Currently detailed information is only available for most AMD (tm), Transmeta (tm) and Intel (tm) processors, but eventually the database will be completed to include all major x86 processors since the 8086.

When looking for data, it is only necessary to enter in L2 data if there is no other way to differentiate between types. Other than that, looking for a CPU is simply a matter of selecting the combo boxes from top to bottom and then pressing the "Find" button. If the processor details match then the description of the model type will be shown beside the "Model" window, and the processor name and code name will be shown at the top. The database can also be browsed via the Prev / Next buttons. In addition, for most new processors further data is shown in the "Stats" box. It is important to stress that this data is simply drawn from the database and has no relation to the current processor. The values shown are the maximum supported, and the date is the first version that was available for the public, not it's first test appearance. (This can be up to a few years difference in some cases.)

If you wish to go back to the details of the installed processor press the "Reset" button.


Here is shown extended OS details for most Windows version.


Here is shown basic information on all drives.

Settings / Help

This tab shows basic system information such as Windows Version, memory usage, IP address and Windows Uptime. Also on this tab is:

About Shows information about CPUSpy as well as registration information
Register Allows you to type in your registration code
Help Shows this file
Freq Measuring Time Changes the time period that the CPU frequency is measured over. The CPU frequency is measured using a separated program section (or thread) so this will not affect operation of the program if it is a large number, it will just take longer to display. The higher the number the more accurate.
Continuously check Frequency Sets CPUSpy to recheck the CPU frequency for as long as CPUSpy is running
Generate Report Save all current results to a HTML file for future reference
Cache Test Executes the Cache test. See below

The cache test takes approximately six seconds to run and provides a rough picture of the computers ability to buffer memory in its cache. Please note that this does not in any way test for faults or lack thereof in your cache. It is simply a benchmark. In short, the Cache test runs a manipulating routine using 12 different size memory blocks and sees how many times it can run the routine in half a second. The higher the number the better the ability. What you should see is a drop in speed at roughly the size of your various cache levels. (We are most interested in seeing any result to this test as the intention is to include in later versions the ability to compare test results.)

Programmers Notes

I hoped to do a major version before 2005 but all I had time for was a few tweaks. It was one of those years. Unfortuntly nothing has changed since then and CPUSpy is still needing a major revision and time really isn't there. However, if your processor is incorrectly identified please EMail me with your report and what CPU you have and I will correct it.

CPUSpy started from my confusion over the P4's small L1 cache size and I intended to spend only a day on it. However I got a bit carried away and a month later I had a program that I decided that I might as well release! (I am still confused incidentally, more later.) While writing CPUSpy I realised that most programs of this type are not clear with what the numbers actually mean, so I added the database section so people can see what values change with each processor. However this means a lot of typing and research and it take a while to track down some of the information. Thus, CPUSpy has support for most AMD, Transmeta and Intel processors and no more.

Since CPUSpy is largely a database I have two version numbers for this program; a version number and a database number. The database number can be found by looking at CPUSpy's file properties. I try to add to the database every month, but I have been a bit busy lately. The last few versions have been largely minor updates, but I want to add Cryix / Via chips soon.

I have large plans for this program, but it does depend on the popularity of the program if I actually will do them all. In particular I wish to increase the testing ability of CPUSpy and have a collection of data stored internally of various processors. For this reason I am very interested in all report files. When I get enough I will add a "Test" tab to allow comparing of data, possibly using graphics.


1.00Initial Version
1.01Improved database browsing and other minor interface improvements
1.02Internal updates
1.03OS tab, Improved database browsing
1.04Drive tab, HTML report file

Licence and Registration

Permission is given to evaluate CPUSpy for a period of 30 days. After this time you are required to either register or remove CPUSpy. Permission is given for all forms of distribution, including CD compilations and Websites, providing the ZIP file is unaltered and it is made clear that CPUSpy is a Shareware program and that registration is required for continued usage. Full terms are on the FAQ page on our website.

CPUSpy can be registered using PayPal, Reg.Net or Mail. For details on the terms of our licenses and of our Buy-Three-Get-All policy please refer to the FAQ page.

Single User
PayPal $7.50 USD
Reg.Net $7.50 USD Bulk deals are also available here. Buy Now at Reg.Net
Mail, Cash $7.50 USD or $10 AUDPostal details in About box
Mail, Australian Cheque $10 AUD
Mail, Non-Australian Cheque $14.95 USD or $19.95 AUD
PayPal $100 USD
Reg.Net $100 USD Buy Now at Reg.Net
Mail, Cash or Cheque $100 USD or $75 AUD Postal details in About box


Sinner Computing accepts no liability for this software to the maximum extent allowable by law. Installing this software is the decision of the installer, and signifies that you agree with this liability statement. Thus, any unintentional damage/loss caused by the use of this software is not in any way Sinner Computing's responsibility, even if it is Sinner Computing's fault. This includes, but is not limited to, physical damage, or loss of income/time. If at any time you do not find these conditions agreeable you are required to remove this software.


Advice/insults (on the subject of the program, not the programmer) are always welcome. While Registered users receive priority support, currently all EMails are responded to as fast as possible. People who EMail can also be added to a newsletter list and be informed of the newest version. Simply send an EMail with "SpyADD" in the subject. (The address is at the top of this file and also in the program itself in the "About" window.) To be removed from this list, write an EMail with "SpyREMOVE" in the subject. Sinner Computing does not give out your EMail address to anyone.

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