AMD Athlon XP 1600+

[mlmaster]

I looked up the specs for my CPU on the CPU World website under AMD Athlon XP 1600+ - AX1600DMT3C. It claims the clock multiplier should be 10.5 and actual bus frequency is 133mhz.

Two questions:

1.) Why does my read out from CPU-Z program (and Fuzzy Logic 4) show a multiplier of 12.5?

2.) Is it safe to set the Frequency in my Bios to 133mhz if I'm somehow using a higher multiplier?

Please let me know if you need any more info. Thanks

[Guest]

Have you tried entering the BIOS and check parameters?

Would be a good start
Report back your findings.


- d.

[mlmaster]

Yes, I can change the frequency in the Bios. It is currently at the default setting of 100mhz. I don't see a way to change the multiplier though.

My question is whether I can change to the higher spec for the CPU of 133mhz. With a multiplier of 12.5 I am worried as to whether I will be over clocking the CPU too much since the CPU World spec reads a 10.5 multiplier at 133mhz.

[Neon_WA]

sounds like someone has played with the bridges on the actual CPU and remarked a mobile processor or something similar

It is unlikely to boot if you change it to 133FSB, but if it does it will likely run very hot

if you can post a pic of the CPU label & bridges we will be able to confirm if is a remark

[mlmaster]

Thank you Neon_WA for the reply.

Unfortunately the CPU has a big heat sink and fan that appears to be permanently attached. I really hate to mess with it if you know what I mean...

I'm not sure where the bridges you speak of would be located on the mobo. I do see an area where different frequencies are marked (100mhz, 133mhz, 266mhz), but I do not see any physical jumpers or connectors.

Just so I understand better... You feel the CPU might be remarked because of the 12.5 multiplier reading I'm getting as opposed to the 10.5 the spec's show?

So if I understand correctly you feel it may run hot at 133FSB because 12.5x133 = 1.67ghz which may be more than the chip can handle?

But isn't it noted as a AMD 1600+ ? Could it be that maybe the multiplier spec that CPU World shows for this CPU is wrong?

Just curious and of course playing Devils Advocate with my line of questioning... Appreciate any help

[koer]

Maybe its stupid question, but are you sure cpu is Athlon XP 1600+ ?
Maybe you have 2000+ (12.5x266)

[mlmaster]

@ Koer thanks for the reply. Man wouldn't that be sweet! Actually not a stupid question at all since the multiplier for 2000 is 12.5. But the CPU-Z program seems to have nailed every spec dead on when compared to specs shown here on CPU World website except the multiplier.

The Name, Code Name, Package, Core Voltage, Specification(AMD Athlon XP 1600+), Family, Model, Stepping, Revision, Instructions, L2 Cache... all the same.

Also, when I look at the 'System Properties' under "My Computer" in Windows it shows AMD Athlon(tm) XP 1600+

Can you think of any other reason the multiplier would be different?

[Neon_WA]

I can confirm the multiplier should be 10.5x
here is also someone pic of their CPUid info
http://www.amdpower.com/images/xpid.jpg

the bridges are on the actual CPU itself and are set in the factory to adjust multiplier, FSB & voltage

One question.. what board are you running?
as it may be the board, not the CPU

[mlmaster]

Thanks Neon_WA, really appreciate the follow up!

Very interesting...so if the factory sets the multiplier is there a way someone could have changed it afterwards?

My board is MSI
Model Name: K7T266 Pro2-A
Model Number: MS-6380E Version 1.0
ERP: 040
Chipset: VT8233A

You may see my pic of CPUid info here:
http://www.learnbyday.com/images/amd-xp-1600+.jpg

I have raised the Bus speed to 110mhz to put the core speed close to 1400mhz and all is stable. The multiplier issue baffles me as to what CPU I actually have. I am reluctant to raise it to 133mhz which will put core speed around 1.67Ghz (hence the 1600?).

This is what really confuses me...if the multiplier for this CPU is 10.5 x 133mhz = 1396.5mhz then how would you get to 1600mhz?

[Neon_WA]

[mlmaster]

Okay thanks Neon_WA

I suppose I have to believe the CPU is a 1600+ and I need to stay around 1400mhz to be safe. I'll leave the FSB set at 110mhz for now in the Bios.

If you can find out anything more about the board and why I'm getting the higher multiplier it is greatly appreciated. If there is a chance I can go up to 133Mhz that would be great, but I'd rather be safe than sorry until I know for sure.

This might be a dumb question and I know the best way is to physically look at the markings on the chip, but I was just curious if there any way the CPUid could be incorrectly indentifying the CPU ?

[Neon_WA]

Yes CPUid can be wrong but normally only for Engineering samples or CPUs only produced for OEMs
and this is a standard processor

I did check the manual.. and no matter what processor is put on the board the FSB defaults to 100FSB and you need to change according to the processor specs

Looking at the bridge settings for 10.5x & 12.5x there is the possibility that if conductive thermal paste is used between the CPU & heat-sink and the paste also covered some of the cut bridges the multiplier could be changed from 10.5 to 12.5