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3. I have just bought a new processor to put in my system. how do I know what jumper settings to use?

The first thing to set is the voltage. This is listed on the processor itself (either as the only voltage listed or as the core voltage.)

As a guide the settings are normally (for socket 7 CPU)
Non MMX Processors - 3.54v
Intel MMX - 2.8v
Cyrix MII - 2.9v
AMD K6-2-3D - 2.2v (some at 2.4v)
(some motherboards do not support 2.4v but do have a 2.5v setting which will work fine in general).

Motherboards for slot 1, slot A,socket A and socket 370 processors are generally autosetting for voltage.

Once the voltage is set then the next thing to do is determine the bus speed and the multiplication factor to use. Sometimes this is written on the chip (almost all the Cyrix processors do this) and sometimes it is not. As a general rule provided that the end figure is close to the stated figure then the processor should run quite effectively. For example an AMD K6-2-300 could run at 3x100 (100Mhz Bus and multiplication factor of 3). But it would also run at 4x75 and at 4.5x66. So which is the best combination to use if it is not stated on the chip? Well in theory the 3*100 should be slightly faster (but only by a few percent) than the 4.5*66 because of the fact that the rest of the system also uses the higher bus speed. However you may find that some of the other components will not run reliably at the higher bus speed so the lower bus speed may give less problems. As a rule use the highest speed that the system runs reliably at, and if you get problems try the lower speed to see if the problems go away.

Some notable Processors settings are: AMD K6-2-300 AFR66 - A 66MHz bus only processor AMD k6-2-333 - A 95MHz processor (but will of course run at 66MHz)

For Cyrix settings see this page.


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