Help me get my CPU past 1085 mHz!

[Sunny129]

ok, the other night i did some CPU testing to see how far it would go. i have a P3 700E cC0 on a CUSL2 w/ a Gorb. i got it to 1085 mHz (155 fsb x 7.0) @ 1.85v. win98 wouldnt boot @ 1.7v or 1.75v, and i got win98 to boot at @ 1.8v but i got explorer errors and the blue screen of death once i was in windows. so i tried it with 1.85v and everything was stable. i then tried to go to 1092 (156 fsb x 7.0) and i got a windows protection error in DOS just b4 the desktop appeared, forcing me to restart. every attempt after that resulted in a system hang. i would go into BIOS and set the FSB to 156 mHz and exit. the system reboots and automatically loads the BIOS again telling me that my system hung the last time i tried to boot, forcing me to lower the FSB settings again. when OCing to 1092 mHz i have two options for the FSB/DRAM/PCI ratio:

1) 156:156:39 (133/133/33 ratio)
2) 156:117:39 (133/100/33 ratio)

option #1 resulted in a system hang. so i tried option #2 thinking that maybe the hang up was caused by my RAM not being able to hit 156 mHz. i still got a system hang up. so knowing that my memory isnt the problem, and i seriously dont think that CPU temp is a problem either (seeing as how it only hits 39C full load @ 1085 mHz), maybe its the PCI bus not being able to handle 39 mHz? any suggestions as to what the problem might be would be appreciated. and also if anyone thinks i can overcome the problem and OC my CPU higher, please let me know...thanks.

 

[bonkers325]

your system cant handle it

 

[compuwiz1]

Eric, since that is a cC0 with a 1.7v default, try up to 1.95v, if you haven't already. Heck, it just may go.


bonkers325, that was from the batch before the dryspell, which was some of the best chips I have ever seen.

 

[Sunny129]

ok, so i guess i'll try a higher Vcore then...i'll try 1.9v first, since i havent tried it already. if that doesnt work i guess i'll put it up to 1.95v...the thing is i'm already scared to use 1.9v...after all, there is a chance i'll fry my CPU. well i'll post again when and if i muster up the courage to use such a high Vcore

 

[compuwiz1]

Eric, most prudent overclockers consider 10 % vcore max. I was running 1.5v celerons at 1.85v, and many have. Of course when trying for the limit, there are inherent risks, but I assumed you assume that by your willingness to push that far.

 

[Regalk]

I consider 1085 an excellent o/c speed for a 700. Anything higher and you may as well put wings on the box.

 

[Sunny129]

well i guess 1.85v is good when 10% above default Vcore is 1.87v, so i guess pushing it to 1.9v is ok. now 1.95v might be pushing it IMO, but i havent been OCing all my life. i would have to say this is my first major OC considering how well i've done so far...so i'll try those Vcore settings and get back to you guys...thanks Steve

 

[bonkers325]

well i take my words back

 

[Sunny129]

hey guys, i havent got a chance yet to try the 1.9v or 1.95v Vcores yet, but i'm going to try a little later tonight. the reason i'm posting again is b/c i noticed another kind of voltage and had a question about it. the "voltage I/O setting," which supplies voltage to the chipset, DRAM, AGP, and PCI buses (which i'm sure you already knew, but this is new to me) is set to default 3.40v, but can be raised to 3.60v. might this help me OC past 1085 mHz? i have a feeling that the PCI bus (or maybe even the AGP bus) is the source of the problem of not being able to get past 1085 mHz. let me know what you guys think...

 

[Hard_Boiled]

Usually raising the VIO like that is to help the memory and the AGP card handle the high speeds. I don't know if it would have much effect on the PCI bus, but it should be alright to try it out and see if it helps.

 

[Sunny129]

ok guys, i finally squeezed 1092 mHz out of her @ 1.95v. i think thats close enough to 1.1 GHZ, and i dont really want to raise the voltage anymore. i know there is just one more setting to try (2.0v), but i just dont want to fry my CPU. i OCs well enough, and i probably wont run it more than 1 GHz anyway...well maybe occasionally, just for the kicks of it. thanks for all the help guys...take care, Eric.

 

[flexer1]

How do you raise the voltage i/o in CUSL2? I don't see it bios.

 

[Dark4ng3l]

I dont think 12 mhz is worth the .1 volt increase you need to acheve it.

 

[Sunny129]

yeah, i dont think so either. as far as the I/O voltage on the CUSL2 goes, it can only be changed by a jumper on the board, not in the BIOS. that is why you wont find an option to do so in BIOS. i posted a question in the motherboard forum about it b/c i didnt know either, but i just recently found out the above information.