Duron 1.3 (12.5 X100) ?

[pike]

Hi

My daughters mb is the Epox EP 8KTA+ and the Epox web site says it can take the Duron 1.3. My question is how can that be when the mb only multiplies up to 12.5? Isn`t 12.5 X 100 = 1.25 Gz and not 1.3? Does the Duron read the 12.5 setting, or perhaps any setting for 13X?

I`m picking up the cpu anyway this afternoon but am just curious.


peace
danny

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[phsstpok]

As long as the processor is locked it will use the correct multiplier.

If the processor is unlocked then all bets are off. Some legacy motherboards were limited to 12x with unlocked processors. Others would interpret 12.5x as 13x. Most could not produce 14x with an unlocked processor.

Things changed with the Thoroughbreds and Bartons. Many legacy motherboards could/can take advantage of AMD's multiplier remappings (as long as the processor is unlocked and the 5th multiplier bit is enabled). The highest multiplier available is 24X with such a processor. The remap table below shows the available remaps.

<pre>Bios Remap
5x ----> 13x (doesn't work on some mobos)
5.5 ----> 13.5x (same)
6 ----> 14x (same)
6.5 ----> 21x (same)
7 ----> 15x
7.5 ----> 22.5x
8 ----> 16x
8.5 ----> 16.5x
9 ----> 17x
9.5 ----> 18x
10 ----> 23x
10.5 ----> 24x
11 ----> (reserved)
11.5 ----> 19x
12 ----> (reserved)
12.5 ----> 20</pre><p><b>56K, slow and steady does not win the race on internet!</b>

 

[pike]

Yup. The Epox EP-8KTA+ with original bios did recognize the Duron 1.3 at 13 X 100Mhz even though the board only has a max multiplier setting of 12.5.

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[phsstpok]

Glad it worked!

The 13x and 14x adaptations built into legacy motherboards later caused problems for overclockers. Internal timings intended for 13x100 and 14x100 processors cause no-POST conditions for people using unlocked processors.

Once a processor is unlocked, the 13x and 14x multipliers become unavailable. There are workarounds. (It's a simple wire mod).

It's not so much of an issue with a KT133 motherboard (like yours). However, KT133A, KT266, KT266A (and even some KT333) owners who want to overclock may find that they need access to the 13x-14x multiplier and don't have it, at least not without the workaround.

<b>56K, slow and steady does not win the race on internet!</b>