how to build a turbopll for intel se440bx-2?

[RuKK]

I have a Intel SE440BX-2 board here which I would like to try and build a turbopll for.. As a learning experience, as because it would make a decent linux box. It has no jumpers to change the fsb or m ultiplier, and theres no options for voltages, fsb or mult in the bios.. So I guess this thing will need vmods and a tubropll to overclock? Are there any guides for vcore/vmem/vio or any other volt mods, or building a turbopll (specificaly for a 440bx board would be a plus I think)? Any ideas? Thanks guys :)

-RuKK

[saaya]

just use cpucool and see if you can change the settings in windows ;)

if it doesnt work you only need to short/connect some pins to change the multis fsb and voltage :)

[RuKK]

Apparently the clockgen on the board only supports 103mhz and 124mhz fsbs so that doesnt do me a whole lot of good, especialy considering I want to get above 133mhz ;)

Now about this shorting pins to change fsb, mult and voltage.. Where can I get more info on this, and which pins are these? Thanks man,

-RuKK

[RuKK]

Oh, and I just checked cpucool softfsb, setfsb etc and they all say they dont support the PLL chip :(

[saaya]

voltage pins
http://www.8086.info/fcpga-oc/oc.htm

cant find the info about the fsb pins... on slot1 cpus you had to insulate pin a14 to make it look like a 133fsb cpu to the mainboard but i dont know what cpu pin that would be... there is no pin a 14 on the s370 version of the cpus...

[STEvil]

a14?

I thought it was B121... doh.


I'm still trying to find the guide on how to make normal S-370 adaptors FC-PGA capable.. its near impossible to find 8-(

[shortcircuit]

overclockers.com had a good article on how to make your own turbo pll. But for the cost of the parts you could probably buy a better motherboard.


http://www.overclockers.com/tips745/

Also, you can turn a 100mhz bus s370 cpu into a 133mhz bus chip. I did it to a Celly 1000, turned it into a 1333. You have to break off a pin from the bottom of the cpu, so there's no turning back. I'll try to find the link...

edit: STEvil, pin B21 was the pin for 66mhz-->100mhz bus

[STEvil]

well, seeing as its a celeron I am playing with.. (400)...

I also thought the trick worked for 66 -> 100 for celerons and 100 -> 133 for P3's seeing as it was a simple high/low pull?

[saaya]

66->100 b21
100->133 a14

[RuKK]

Ok, so if I mod my celeron 300A for 100mhz FSB (I know it'll run it...... without a heatsink :D), then swap out the crystal on the mobo for one of a slightly higher value, that will work as opposed to building a turbopll?

[Illicit Tweakin]

If you just swap out the crystal averything will be screwy on your board after. The clock, pci, and mem, use the crystal as a ref and they need the stock one. Turbo pll is not much harder than swaping the crystal. Do you have an old MB you can cut the pll circuit from? If not I would find one.

[RuKK]

Yeah I have a 486 mobo here which has a promising looking PLL on it. http://www.icst.com/pdf/ics9155.pdf is the datasheet for the PLL on the 486 mobo (its the 32mhz one, not the 16). Would this be suitable? I dont care if the USB/FDD/LPT etc work, as long as I have the PS/2s and IDE controller working.. I dont mind high PCI/AGP frequencies as I have hardware which will take it so thats not really a issue for me until like 150~ fsb, which I dont think I'll be getting near until I get this beast a P3. Thanks,

-RuKK

[STEvil]

heh....

I got hold of an old ISA ATI video card with dual monitor output (one tripple level, one dual level, for old monitors) and its got a 40mhz crystal on it.....