hey thank you all for the replys, my only concern for changing the oscillator is to increase its ISA onboard IDE controller, because its one of the main reasons(lack of cache is one too) why my pc is sooo damn slow, im sure it uses the standard 4.77 or 7.13 Mhz bus clock untead something better, which for a pc from 1995 it should be faster or atleast jumpers to change this.. also i've seen on forums that some dude increased its bus clock speed but in BIOS for his ethernet adaptor changing the clock divider value, and noticed a big increase... however mine hasnt any settings to do that kind of job.
I would try one day and see what happens, but as feipoa said some important controllers will be really screwed, floppy, serial ports, dma controllers, keyboard, etc...
I've seen in veeery old posts from late 1999 to 2002 people talked of a tool named TurboPLL which could increase some specific freqencies replacing the ref xtal and soldering some pins.. its the same idea but much more tecnical.
Well, here comes another question 😀, its possible to find out the ISA clock input pin (B20 CLK Pin, if my memory doesnt fail) and directly insert a higher frequency from a external crystal oscillator circuit soldered close? (maybe it needs to be buffered, dunno...)