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P3 1GHz overclocking adventures

H

homeskillet

Junior Member
hello people

i've been trying to get my p3 1ghz cD0 stepping to that magic 1.2 ghz line. i'm so close!!!!! i'm stumped and i'm wondering if you guys might be able to throw me some suggesstions or tips

here's specs:

Intel Pentium III 1GHz, stock HSF, cD0 stepping
Abit VH6-II Motherboard (Via Apollo Pro 133A)
384 MB RAM CAS3 Generics
Voodoo 3 2000 AGP Oc'd to 175 MHz
Antec SX830 case, 300w PSU
Windows Millenium / Progeny Debian

anyhow the highest i have gotten stable is 1185 MHz (158 fsb x 7.5 locked multiplier). to get this i had to up the vcore to 1.90v. i tested stability by running sandra and 3dmark, playing some hitman. now i KNOW everyone is going to tell me to get a REAL hsf, but my temps are OK - 52 celcius at max load. its not that bad because im not going to leave it overclocked till i get some better cooling, i just wanna see how far i can push it. when i go to 1200 mhz (160 fsb) i can post, then i get to the windows loading screen an it crashes. after that i hit reset and it didnt post. had to clear cmos.

just wanted to say first off that i am thoroughly impressed with the Abit VH6-II. I have put it under a lot of stress with generic RAM and it has run ROCK SOLID at 155+ fsb. although some may call it a cheaper low quality board, i have worked with both the BE6-II and BX133-RAID and this VH6-II is right up there with that Abit quality. imagine what this board could do with a celeron!!!

anyways do u guys know what i can do to get 1.2 ghz? i have my memory latency at CAS3 and all of the bank timings at the default 10ns (i dont knwo what these do). also what is a safe voltage for p3's with aircooling? can i go to 1.95 vcore safely? lastly, i would get a real heatsink but ive heard horror stories and i dont think i could stand the noise of a 7k delta - i have to sleep about 5 ft away from my computer and i like to leave it on. can anyone reccomend a cheap yet effective hsf for this? thanks guys.
 
I think you can make it to 1.2ghz with good cooling. Get an Alpha PAL6035 with a quiet fan. I would stay at 1.9v. 1.95v is too high for me. The Alpha costs about $30.😎
 

You're gonna hafta get that temp down! If nothing else, open the box and put a fan on it.

Sounds like you have a good chip, but a p3 under load should not be that hot if you are trying to push to high speeds.

anvil

 
i understand what u guys mean. however i dont have the money for a new heatsink and i just want to see how far i can push it. i wouldnt leave my proc at 1.18 ghz with stock cooling, expecially since i like to leave the comp on 24/7.

im going to upgrade this summer before i go to college. ill probably get a new video card and cdrw drive. hopefully my dad will alsohelp me out with a new hsf.

so what is the best fan for the alpha pal6035 - ystech 26cfm, delta thin 22 cfm, or sanyo denki 20 cfm. i dont think ill be able to live w/ a 7k delta 🙂
 
Maybe getting rid of the Abit board may get you there. Those are kind of a POS, no offense. 😉

Also, your generic ram might be holding you back? Try taking a stick out, and see if you can go higher.
 
i have had nothing but good expeirences with abit mobos. but tahts just me. besides, i have heard lots of bad things about the cusl2. also the vh6-2 was a really good deal when i bought it.
 
Bad things about the CUSL2? I'd like to hear this.....

I've built a few computers with it and have never had my friends call me back reporting problems about the motherboard. (Only user-end problems) 😀
 
I used the Abit BE-6 2 to overclock at least 10 different Intel cpu's, P3 and Celeron, slot 1 and fcpga, it kicked butt. P3 with cBO does not like to run over 45c when under full load at top speed, better cooling should get you 1200MHz. Make sure it isn't your RAM holding you back.
 
Whoa!! Sounds like you got a kinda crappy HS there!

With better cooling it should be fine. My P3-933EB(cBO stepping) runs at 1050Mhz with 1.95V VCore. It's done this problem free for the past 10 months! I think 1.95V is fine for a P3, they can hold like 2.0V no problem. I was hesitant, but my computer runs without a hiccup at this voltage.

My P3 also puts out about 38 watts of heat, running at about 41C on an Alpha PAL6035 that currently has a low CFM 80mm fan on it. A 19CFM Sanyo Denki 60mm put me at ~42-43C full load. I think this setup will easily get your temps below 45C, and is very quiet.

As for overclocking to the nice 1.2Ghz, it seems your RAM isn't the problem. I've usually had a computer fail to get past the RAM Check, or not even post if the RAM is being stressed beyond its limits.

Heat maybe a problem, but I doubt it if it's locking up at the Windows splash screen.

It really sounds like you've either reached the limit of your chip, or it needs a bit more voltage.

Bump VCore up as high as it goes, and let 'er rip!!!

Although I would recommend that you run at the fastest speed you can do with the RAM at CAS2. Memory bandwidth makes a bigger difference than the few Mhz you can pick up running CAS3. Just my opinion.
 
I gotta agree with Def, if you can run your memory at fastest timings and sacrifice a few mhz your power hungry apps will get more joy.
If you are only running the box to say you can do 1200mhz then get some cooling.
 
homeskillet is liven on the edge 🙂

all this talk of o/c makes me wanna o/c mine past 800 ( from 600 )

hey Def, you say p3's can go up to 2.0v's, is this a sure fact?

look at my system rigs... i have a p3 coppermine 600... it runs cool 40c at 800mhz... i knwo i can push it higher... it just doesn't post after the 133fbs... like it's just a huge cut off... it's fun at 133 no problems.. i goto 135 and BOOOM no post... just a little change like taht shouldn't effect it...

i mean it should post go in windows and then lock up or whatnot but when it's just a little step like that.. it doens't make sense
 
KBrinks, what's your voltage at now?
Many of us have had P3's running 1.95V and above for quite a while - as long as your cooling is good it should work for you. Is your ram good quality?
 
thanks for all of the replies people.

i bought the cD0 stepping p3 1ghz at Fry's electroncs in san diego, CA. is this the best stepping for a p3 chip?
 
I also think you need to cool the chip down some. I've got a cC0 PIII 1 GHZ running at 1.2 GHZ with 2.0V I'm using a modified PEP66T and get max temps around 100F/38C.

Also, the memory could be holding you back. Does this board have a feature where you can running the memory bus higher the CPU bus? If so, you could take the CPU back down to default speed(or maybe a little bit less) and then see if the memory works at the higher speed.
 
wow JmsAndrsn you've gotten your 1ghz at 2.0v? That seems kinda high. Anyways, I've gotten my cC0 1ghz to go 150fsb at default voltage stable. It did a little higher without tweaking voltage, but at some point (i think it was 154 fsb or so), my system was entirely unstable no matter what voltage I used. I'm guessing there's a bottleneck somewhere in either memory, video, PCI cards, etc. anyways, i'm happy with what it can do already.
 
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