AMD Athlon 1200 or XP 2100?

December 29, 2005 at 23:48:32
Specs: Windows XP SP2, ??/512MB

I have an old Compaq Presario that burned out it's CPU. I recently decided to get it running again.

The original CPU that burned out was an AMD Athlon 1200. After installing the new CPU (I ordered the same CPU that burned out) I noticed the bios was registering it as an AMD Athlon 1400. In another long story I found out that my bios was corrupt ans I thought that this may be one reason why the CPU was registering/displaying incorrectly.

After updating the bios and installing Windows XP it changed but not to what I expected (an AMD Athlon 1200). The bios is registering the CPU as an AMD Athlon XP 2100 and this is what is displayed in Windows, AMD Athlon XP 2100 500MHz.

Why would the CPU register so differently before and after? Everything is running OK but if the CPU is really an AMD Athlon XP 2100 do you think it will be safe to leave this CPU in there? Aslo Windows is displaying a 500MHz after AMD Athlon XP 2100 to my knowledge an AMD Athlon XP 2100 is a 1.7GHz CPU with 266MHz FSB so what would the 500MHz be for.

See More: AMD Athlon 1200 or XP 2100?

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December 30, 2005 at 04:55:17

To check your CPU settings, download & run CPUZ version 1.31

This space for rent

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December 30, 2005 at 17:38:34

The nightmares of namebrand pc's. My question is can you even adjust anything cpu related in your Bios considering it's a Compaq?????

AMD Athlon 64 X2 4200+
2GB Dual Channel DDR 3200
Nvidia 6800GT
SATA II 250gig 7200rpm 8mb cache
Gigabyte Nforce 4 SLI

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December 31, 2005 at 21:31:42

According to the number on my chip "AHM1200AHQ3B" and I have this chip;

"Mobile Athlon" wouldn't that be for a Laptop? Anyways, this still wouldn't explain why the chip was read as an AMD Athlon 1200 and then an AMD Athlon 1400 and then by Windows as an AMD Athlon XP 2100 and now CPU-World is saying it is an AMD Mobile Athlon 4 1200, or would it? This is rediculous, what is it?

Thanks for all the help. I will try that program and No, I can not change any settings in the Bios that have to do with the CPU.

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Related Solutions

December 31, 2005 at 22:13:54

This is what CPUZ had to say:

Name AMD Athlon 4
Code Name Palomino
Specification AMD Athlon(tm) XP 2100
Family / Model / Stepping 6 6 2
Extended Family / Model 7 6
Package Socket A
Core Stepping A5
Technology 0.18 µ
Supported Instructions Sets MMX, Extended MMX, 3DNow!, Extended 3DNow!, SSE
CPU Clock Speed 500.9 MHz
Clock multiplier x 5.0
Front Side Bus Frequency 100.2 MHz
Bus Speed 200.4 MHz
L1 Data Cache 64 KBytes, 2-way setassociative, 64 Bytes line size
L1 Instruction Cache 64 KBytes, 2-way set associative, 64 Bytes line size
L2 Cache 256 KBytes, 16-way set associative, 64 Bytes line size
L2 Speed 500.9 MHz (Full)
L2 Location On Chip
L2 Data Prefetch Logic yes
L2 Bus Width 64 bits

So is it an AMD Athlon XP 2100 then? Also, according to the results what is actually my full CPU speed? I noticed it said "CPU Clock Speed 500.9 MHz" but it also said "Clock multiplier x 5.0". So is it a 500.9 MHz CPU or does that mean it is a 2504.5 MHz CPU?

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January 2, 2006 at 09:05:07


Follow this link and download this software, just to make sure what cpu do you have.

Then you must adjust the clock speed and multiplier in the bios (if possible!) to have the right speed in Mhz (2100+ must work at 1733 Mhz,FSB 266, that´s 13x multiplier)

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January 2, 2006 at 22:34:26

I downloaded the CPUInfo and it gave me the same information as PC Wizard 2006. PC Wizard 2006 gave me more info though and I have displayed it below. It looks like the multiplier is set to 5x which is probably the problem but I don't think that there are any settings in the bios to change this. I don't understand what I am suppose to do. My 1.2Ghz chip burns out and I order a knew one that I can't get to run faster then 500Mhz because I have no way to set it any higher?

General Information
Type : AMD Athlon 4
Internal Specification : AMD Athlon(tm) XP 2100
Codename : Palomino
Revision : A5
Technology : 0.18µ
CPU ID : 6.6.2
CPU IDEx : 7.6.2
Number of Core : 1
Mobile : Yes

General Information
Performance Rating : PR-200 (estimated)
Real Frequency : 500.9 MHz
Multiplier : 5x
Startup/Max Multiplier : 5x / 12x

Front Side Bus Information
FSB Frequency : 100.2 MHz
Bus Speed : 200.4 MHz (DDR)

Initial Frequencies
Frequency : 1200 MHz
FSB Frequency : 100 MHz
Multiplier : 12x

Control Clock Frequency
Type : PowerNow!
Mode : High

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January 6, 2006 at 19:41:29

I'm having a similar issue with my new AMD Sempron 3000+ which is supposed to have a core frequency of 2000 MHz and is registering as an AMD Athlon MP in CPU-Z with 1199.1 MHz. I updated my MainBoard drivers and I know this CPU is compatible with the update, as stated specifically by the manufacturer. I then installed the AMD drivers for this supposed CPU model. BIOS is configured correctly for the model, yet at boot-up it prompts "uncompatible CPU or not configured correctly." This is a new CPU, but did not come in the AMD box and there's nothing more than a serial type number on the CPU. My theory is that I bought an AMD Athlon 2100+ that runs unoverclocked at 1200 MHz, but was simply listed as a Sempron 3000+ which the seller insists it is.

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January 19, 2006 at 06:03:30

Looks like most both of your issues with the CPU running underclocked, from what the CPU is listed for, is a simple BIOS setting. Many motherboards will POST a very minimal CPU speed after a BIOS flash and/or reset or after a new CPU is installed.
The 500MHz Athlon XP2100+ needs to simply have the corect Speed settings (FSB and multiplier) set in BIOS. The motherboard is running the *minimum* settings right now.

For the Sempron 3000+, an older BOIS will see the CPU as an "Athlon MP" until the the BIOS gets updated. This is from the CPUID string settings in the BIOS. The name is no big deal. However, to get the CPU up to full speed, you will have to change the FSB (Front side bus) from 200MHz to 400Mhz. You can use the CPU-z progam also, to check what you CPU is, and that your seller is corect.

I hope this helps! I will come back and answer any other questions you folks may have on this!

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January 24, 2006 at 03:39:16

Actually, after contacting Compaq and finding out my exact make and model of my PC and after a lot of research, I found that there was no way to set or change the multiplier or FSB on my PC through the bios, jumpers or software, it was locked.

As for the CPU running at 500Mhz. After double, triple and then checking again, it all came down to the serial number on the CPU. When I first ran it over at it came back as an Athlon 1200 MP. I didn't want to beleive that these people were stupid enough to send me a Mobile CPU in place of the Desktop CPU I ordered.

This was the case though and because my PC was not fully compatible with the Mobile CPU it was defaulting to a lower multiplier.

As yet, I am awaiting my Correct CPU in hopes that the multiplier has not permanently defaulted.

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