If in doubt set for 2.0x 66MHz = 133MHz. That will give almost identical performance to 2.5x 60 = 150MHz as on So7 almost everything runs at bus speed, so higher bus is far more impacting than higher multiplier.
The manual is a classic example of far too much information about stuff that doesn't matter (pages on pinouts of standard interfaces) and excessively specific stuff for individual CPU types without just telling you what each jumper setting actually does like they did do with voltage setttings - there's a partial list at 1.6.3, but it's clearly not complete. There are three FSB jumbers, FS0, FS1 and FS2 and one SD. That gives 2^4=8 possible settings. I can't read the PLL chip markings (little black IC beyond FS0/1/2 and SD jumpers and the clock crystal), if you could, you can look up its datasheet and see what's what. Come to think of it, that silkscreen might show what you need. Maybe take a good pic of that area so both silkscreen settings and the PLL chip next to them are legible.
What we do see in 1.6.3 looks odd to me, it strongly looks like SD does more than just sync/async RAM - take a look at 66MHZ vs 90MHz, they have FS0/1/2 identical and only differ on SD off/on.
It is entirely possible that no speeds under 66MHz are available. I've found a picture of the similar Biostar M5SAF that's good enough to read its PLL. It's an ICS 9248-81. Looking at its datasheet it could well be what is used on the M5SAA too. Page 4 shows the available settings. You need to reed them back to front and inverted (i.e. they list SD first and FS0 last, and 0 = jumper on and 1= jumper off). The settings that match with 1.6.3 in the manual seem to correspond, in which case this is what you can choose from.
You can try and have some fun if you have PC100 or better RAM - the CPU might run at 1.5x 100MHz (FS0 on, FS1 on, FS2 off, SD off - and then BF0 open, BF1 open), or you could run it at 2.0x 66MHz but with RAM at 100MHz (FS0 off, FS1 on, FS2 on, SD on)
