Carlos S. M. wrote:Did someone saw another Slot 1 mobo with options for FSB speeds below 66 MHz, do they also work? I haven't tried the FSB speed options in this board yet and i don't have an unlocked Pentium II (afaik) to take advantage with it though
There was a time when I was actively seeking such motherboards out. It is in this thread 50 to 133MHz FSB on a BX Mainboard with a lot of other things. Usually such boards have the ICS9148xx-26 or ICS9150xx-08 PLL. The older revisions of the well-known Asus P2B are among them. There is also mention of an i815 board that could be persuaded to run at 50MHz FSB.
Some boards support 50MHz FSB as well as any other speed, but IIRC the P2B gets temperamental... oh here it is:
gerwin wrote:Asus P2B rev 1.04 has a small issue with 50 MHz FSB: it can boot up with 50, or switch to 50 once, but when you change FSB after that it usually hangs.
Still really like the 50MHz FSB support on motherboards. Together with a pre-august '98 Pentium II you can as low as 2.0x50=100MHz. Or you can combine it with a VIA C3 CPU on a slot adapter, like Kamerat already mentioned.
In the past I tested a few dozen old games on system with a downclocked Pentium II/III and there were several problems (often sound related) that went away when going to 200MHz or lower.
Scraphoarder wrote:The Dell Optiplex GX1 (BX chipset) comes to my mind with using Ctrl-Alt-\ or Ctrl-Alt-# on the fly to slow it down. I think its no software slowdown, but related to hardware by either disable the cache or clock the cpu down.
Would be strange if there was only Dell who used this feature and maybe this is an undocumented feature from Intel that is possible are on other boards too?
Interesting. It would be easy to test if it is L1 cache related. I don't believe Dell really had a way to change the FSB to CPU speed multiplier.