I am planning to upgrade to a K6-3+ 450 on a gigabyte GA586SG motherboard. It presently has a Pentium 166 mmx and version 1.15 of the bios. Has anyone done this before on the GA586SG and do you have any advise?
I looked up the motherboard specs at Gigabyte's website and have determined that the highest processor that motherboard will carry is the K6-2 300. Trying to put the 450 in there will result in a non-bootable computer.
Ask over at amdzone forumns they have a special section devoted to the k6 series of processors and some one will sure to help you. You may have a problem with the + series of chips it all depends, however a normal k63 would work. What voltage settings are available to you? The highest you will be able to run the chip at 66 fsb is 400. Overclocking it to 75mhz will give you 450 mhz. This would be by setting your multiplier to 2x which all k6 series chips interprits as 6x.
the fastest my brother's mobo would officially support was 250.
K6 2 450 worked in there quite nicely for a long time too...
it no longer showed a clock speed after the POST, it just showed a spade... lol
but it worked fine.
Independant thought is good.
It won't hurt for long.
You might be right, I never actually tried sticking a 450 in a motherboard that "unofficially officially" supports only a 300mhz K6-2 as the highest it will go.
The motherboard in question uses the Intel TX chipset which officially only went to 233mhz. The most recent BIOS update on GB's website supports 300mhz using a "trick" setting the jumpers a certain way to get there.
I believe that the system will not work properly even if it does POST.
You are completely wrong. Every standard Pentium motherboard made that supports 2x multiplier will work with the K6 series at 400. The only ones that will not are specialty boards from Dell and maybe Compaq. Some boards do not allow split voltages, which means that they require a voltage step-down converter. But I have run almost every type of standard dual voltage motherboard made with the K6-2 at 400 or 450 (depending on the limit of bus speed) using the 2x=6x trick. Even at 2.8v the 2.2v K6-2 works fine, if you properly cool it. But he has the voltage he needs, so I can say with confidence that it WILL WORK!