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LesD
aus Stafford, UK
offline


OC Newbie
12 Jahre dabei !

AMD Thunderbird B


I have a machine with an AMD Athlon 1 GHz processor on a Jetway 663AS Pro rev 1.2 Motherboard, flashed with the latest BIOS available from Jetway.

I believe the processor is a socket A type A1000AMT3B It is announced in the post during bootup as AMD Athlon TM 1000MHz (100x10.0).

I would like to put the fastest processor this motherboard will accept in place of the 1 GHz one and believe this to be an AMD Athlon A1400AMS3B, which is poving difficult to get hold of. Are there any other processors that are available to provide me with such an upgrade? The 256 KB on-board cache is the obvious attraction of the Athlon processor.

I have seen a number of the 133 MHz (266 MHz FSB) processors but a lot less 100 MHz (200 MHZ FSB) ones about. Can a 266 MHz one be "unlocked" to run at 200 MHz (underclocked) and still give me 1.4 GHz at 10x?   :noidea:

I did a Google search and downloaded a load of information about overclocking by shorting links on the AMD chip using a "graphite" pencil or with a conducting paint or epoxy but can I drop a 266 MHz A1400AMS3C straight in instead of the 200 MHz A1400AMS3B. As the motherboard clock speed is 100 MHz the S3C would presumably double that to 200 MHz but what would the multiplier be? :noidea:

This confuses me because when I tinkered with my old m571, to replace its Cyrix P233 with the AMD K6 2 450, it was a simple process of moving jumpers about as the K6 reads the 2x multiplier as 6x. The Jetway board seems to read the processor and do this sort of thing in the post or the BIOS. Is this right? The Jetway MoBo has no jumpers that I can find for this purpose.

The processor links I have mentioned shorting claim to "unlock" the processor. So if it is unlocked what speed would this "autodetect" feature that my board appears to use, actually set. I bet you can tell that I am out of my depth now.

As I mentioned I have used Google to trawl for information about overclocking with pencil lines, conductive epoxy etc. and reckon I could do it if the mood takes me but strictly I would be underclocking! Is this a realistic possibility?

My Jetway Motherboard and its BIOS are my biggest unknown. I have got an AMD K6 2 to work at 450 MHz where the x2 multiplier setting on the MoBo is read by the processor as x6 but this was done with physical jumpers that I could understand and a lot of help on the EYO technical forum. It appears to me that this Jetway board recognises a flag maybe read from the processor and sets the multiplier to suit in the post.

If I un-lock a 266 MHz processor does this un-set this flag I have postulated and need something else to set the FSB? You can see this is where I am out of my depth and my searches so far have not come up with an answer but I shall keep looking. :bigconfused:

Any help or advice would be appriecated. :)


Regards,Les

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LesD
aus Stafford, UK
offline


OC Newbie
12 Jahre dabei !

AMD Thunderbird B


I have been having a play with the Painting Guide see "Interactive painting guide - TB and Duron overclocking by pencil and knife" from the list of "AMD Socket A guides" on this site  and cannot see how an A1400AMS3B ever works. Since with the FSB at 100 MHz making the Systembus 200 MHz the maximum multiplier that is available is 6.25 hence the processor runs at 1250 MHz maximum not 1.4 GHz! What am I missing? :noidea:


Regards,Les

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LesD
aus Stafford, UK
offline


OC Newbie
12 Jahre dabei !

AMD Thunderbird B


Hi Folks,

I got a lot of help here: :thumb:

http://forums.amd.com/index.php?s=cfaf99a72b7cd22779dc3671e8448dfa&showtopic=33362

For anyone who may be interested.


Regards,Les

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