EXTREME overclocking a p2 on an abit bh6

[cirthix]

i have 7 slot 1 cpus, 2 abit bh6 motherboards, a bagful of sdram, and nothing to do with it.... so i thought maybe i could do some crazy voltmods on the mobo (maybe 3.3 volt line from power suppl to lots of caps straight to cpu, maybe soldering the 5v line from the psu right into the ram power pins... i dont wan to kill the board instatly, but i want it to run really really really fast for a while). give me mods, bioses, hints, tips, etc.

cliffnotes: i intend to take a pentium2 to crazy speeds :banana4:

[cirthix]

i have 7 slot 1 cpus, 2 abit bh6 motherboards, a bagful of sdram, and nothing to do with it.... so i thought maybe i could do some crazy voltmods on the mobo (maybe 3.3 volt line from power suppl to lots of caps straight to cpu, maybe soldering the 5v line from the psu right into the ram power pins... i dont wan to kill the board instatly, but i want it to run really really really fast for a while). give me mods, bioses, hints, tips, etc.

cliffnotes: i intend to take a pentium2 to crazy speeds :banana4:


o, and its spring break, so i have some time :banana:

edit: oops, i pressed quote instead of edit :rolleyes:

[dfinf2]

i give it an our maybe running lol i gotta c this though

[STEvil]

You can solder +3.3v directly to vcore choke closest the +3.3 pins on the ATX header. Dont solder to the opposite side, though.

It WILL kill P2's rated at only 2.0v, though.. you need to use the older ones rated at 3.0v+ vcore for it to work correctly.

[Foxie3a]

What's the difference between the BH-6 and the BE-6? I use a BE-6 Rev.2 for my test computer. The other day I looked at the max voltages, and it allowed upto 3.9v on the RAM, and somewhere around 2.5v for the CPU.

I'm going to watch this thread, I'm curious to see how high you'll be able to go. I want to get my P2(4x100) to 133 FSB. You should try overclocking, then when you are done put some heatsinks on the voltage regulators. I'm curious to see if they get hot enough to benefit from cooling on a P2 system.

Good luck. :)

[STEvil]

BE6/-II actually allows up to 3.3v for CPU if you install a P2 with 3.0v defualt vcore.

You can do mods to the slot cards to force higher default voltage too.

[cirthix]

basically, if you give me a mod that i can solder (i'm pretty good at it, so toss em at me) and will not immediately kill the board, i'll do it!

and i have a bunch of p2s and a p3, can anyone link me to a model# decoder to find the voltages on them?

and for clarification, the board says "AB-BH6" between a few pci slots. i'll also be using a geforce2 (you gotta see the heatsink i epoxied on it, OMG its huge!), which i think was made not too long after the board was, but i wasnt in to ocing or even comps back then, so i'm probably wrong :p:

pics will be included if i get this project off the ground... but for that to happen, you guys gotta dig up pictures of voltmods and stuff for me :D

[STEvil]

P2's are either 3.0v or 2.0v (Klamath or Duechets core), P3's are 2.0v (Katmai), 1.6-1.75 (Coppermine), or 1.2-1.4 (Tualatin).

There may be a mod you can do to raise vcore on the board, but if its like my BE6-II's you'll kill it if you arent carefull. Used a 10k 15 turn VR on mine and going less than 1/4 turn jumped from 2.0v to 3.6v on me killing the board.. might be more current going through there than the VR could handle, not sure really.

The other way to increase voltage is the bios flash trick. Set to your max voltage then flash the bios and you'll be able to select higher voltages. With more than one board you'll have a spare chip for hotflashes if needed.

[cirthix]

ok, what bios should i use?

[STEvil]

the one that performs the best?

[cirthix]

i wasnt into comps back then (only playing red alert and c&c on a dos machine lol), so a link would be helpful cause i dont know what was going on back then

[STEvil]

I dont know what one performs the best, you'll have to test them to find out..

[masterofpuppets]

If you want to do a fun, but short suicide run, overclock the hell out of it, then remove the heatsink while it's running and open dual prime95! Burning and bad smells will follow. I tried it once with a random Asus mobo and a Pentium II 233. Pics:

http://www.m0px.net/photos/blowinupthepentium2a.JPG
http://www.m0px.net/photos/blowinupthepentium2b.JPG
http://www.m0px.net/photos/blowinupthepentium2c.JPG

I was running it over a flammable carpet on a wooden desk, so I didn't let it get to the point where it blew up, but it got REAL hot and started to smoke when I switched it off. I put the vcore to the maximum the BIOS would allow and ran the chip at 400MHz, but the board's crappy overclocking options wouldn't allow more that that.

[cirthix]

masterofpuppets, the goal isnt to kill the setup (which might happen :P), its to get old tech running as fast as possible. and i'd like to know waht that molex connector is soldered to the video card for... voltmod? cause i have a card that looks like that and could use some extra juice (it artifacts, so a voltmod might fix it)

[cirthix]

sigh, no voltmods, i guess i'll cancel this project then :(

[Falkentyne]

The BIOS flash trick only works on the BX6 and BH6 (it should also work on the Bh6 1.1, which is really a BH6 1.0x with a more stable northbridge/AGP (Geforce 2 cards tend to lose 3D signal when run at AGP 2x at higher FSB/higher AGP, than BH6 1.0 boards did, which would lose signal much lower; setting to AGP 1x removed this issue, but on some cards, you can't run >80mhz AGP with sidebanding enabled), and the w196x clockgen with 29 distinct FSB speeds (32 total), and a very similar BIOS (the only difference really, was support for the extra FSB speeds, and a couple of non important BIOS options changed).

The BIOS flash trick does not work, AFAIK, on the BX6-R2, BE6-2 or BF6.

Oh yes, you have to flash with the /py /sn /cc /cd parameters, after you set the voltage to the highest level available, this will usually do it.

One word of advice,
Do NOT warm reboot after a BIOS flash; doing so could have your CPU Default voltage set at 3.5v (happened to me once on a 2.0 P3 when I didn't RESET, instead of using the 3 finger salute...lucky for me I was able to QUICKLY change the voltage, speed, and reflash).

[cirthix]

so 3.5 volts didnt kill your 2v cpu... cool! but ya, if i can't find mods i cant really do this project...

[H2gO Flasher]

I would have thought you’d reach the board chipset limitations before hitting CPU ceiling - but don't let that stop you in your quest :D

[cirthix]

well, i can solder most all mods, so i'll do any one that i find. i just gotta find em. i'm not opposed to overvolting the chipset

[H2gO Flasher]

Orthello's Extreme Cooling (http://www.extremecooling.org/ec/modules.php?name=Content&pa=showpage&pid=2) maybe of assistance
Showings it's age now being Published way back: 2002-03-29

[_Eduard_]

i know someone who had a p2 with a nice oc'ing board, no PCI locks though but unlocked multi. went up to 450mhz.... 100mhz oc not bad for stock cooler.

Someone put a cascade and 4v through one plz lol :) 800mhz must be possible

[cirthix]

well i wont be using sub-ambient cooling

[i found nemo]

just solder stuff together, c what happens and take a pic