How to underclock Pentium 4 with Clockgen

I am stuck will a 4 year old Dell Inspiron 9100. It has a 2.8GHz Pentium 4 HT. How do I under clock it using Clockgen? What PPL model do I select?

 

You find the chip set! Only way you might be able to find, open notebook, maybe not a great idea. Ok so where are we? Even though you have many choices for ppl there are "family" of them. Pick differn't ones first one that reports anything that makes sense with readings keep looking until the clocks make sense. The help button describes this better than I can. The main point is if you have the wrong one it will show you junk.

 

ok. thanks.

 

I have spent many long nights and many long hours trying to figure out how to overclock my P4 in a desktop application. Read this carefully, YOU CANNOT OVERCLOCK A PREMANUFACTURED PC < I.E> DELL, SONY, HP, COMPAQ, GATEWAY. The motherboard bios limits the amount of voltage the cpu cand handle. You cannot reflash the mobo either as these companies buy custom bios's from their manufacturers. Futhermore, do not try and overclock a laptop processor. They are in compact space and already produce enough heat. Overclocking will produce more heat and could cause meltdown. If you wanna overclock your computers in the future, either build a desktop, or buy a laptop from a company that does not lock their mobo bias. Not even software tools like clockgen will let you overclock your processor.

 

You are wrong! Also the question asked was underclocking, so you are more wrong. I can and have overclocked my FSB increasing CPU and RAM speed! I do watch temp and there are ways to control. I do not have heat issues when I overclock. You are wrong, that's it but you did not even answer or address the question!

Edit: overclocking is not messing w/voltage

 

Find the PLL then search google to see if anyone else has played with that particular PLL using any programs like SetFSB, CPUCOOL, Clockgen, Systool, etc...

PLL's usually say "ICS*****" or "CY******". Winbond also manufactures PLL's. It should be located near the CPU socket or northbridge and will have a lot of pins comming of the side of it.

 

All you have to do is go thru every one and find the one that reports your clocks correctly. Also I disable the part that adjusts PCIe and PCI after I have found not b/4. It is easier to click and see than open up your notebook. When you find the right one it displays correctly! That's it. But if Google works good idea!

 

First of all, he is talking about UNDERCLOCKING, not overclocking.

And second of all, every single thing that you said on there is not true. You can OC laptops and OEM systems, and you CAN use software like clockgen to OC them.

And given that most laptop cpus are overvolted, one does not need to worry so much about overheating from OCing if you know how to undervolt.

I OCed my cpu after I undervolted it, and at the higher speed I still ran LESS voltage than stock. So my OCed cpu ran cooler than the stock cpu the computer came with. So I would say that keeping your cpu stock is more of a threat of overheating than if you unvervolt and the OC it.

 

By using RMclock you should be able to limit the cpu to a lower speed. My athlon 64 mobile runs at 1.8GHz max but can be limited to 1.6GHz, 1GHz, 900MHz and 800MHz.

 

Find me one instance where you have overlocked a premanufactured processor or video card. Im talking sony, hp, dell, or any other major manufacturer besides asus/clevo. There bioses are locked. Motherboard manufacturers lock the bios for exactly for that reason. durrrrrr. boons. I have spent days upon days using software programs like clock gen to over clock my sony p4 and also an hp, and a tohsiba. You cannot change the voltage in any premanufactured pc. You think you can change the fsb with clockgen you cannot, the software will tell you you have, go to the bios and check the fsb it will not change.

 

You have no idea of a true overclock. Let me guess you have used clock gen to move your fsb up a little hahaha. Let me know when you have played with voltages then youll get a real lesson on overclocking. Im not syaing you cannot overclock a laptop or a pc, im saying you cannot overclock a premanufactured pc I.E SONY DELL HP GATEWAY

 

You wanna know what ppl model to use you will not find it. The only motherboards listed on clockgen are aftermarket mobos. I.E. CUSTOM COMPUTER MOBO.

 

Your right overclocking is not messing with voltage for the first 800 mhz frontisde if your lucky. Once you start overclocking one gig or more your going to have to start changing voltages to keep up with the processors demands for power. It all depends on configuration and how far your processor can overclock before you have to up voltage. dont belive me, here is some help WWW.TOMSHARDWARE.com

 

I tried to underclock, but nothing changed. Oh well, hopefully I won't be stuck with this loud mess for to much longer. I do use I8kfangui, so that kind of works.

 

This information is not completely correct. There are 2 types of overclocks, the first which I think you are thinking about is a hardware overclock, this is done via the BIOS and yes manufactured PCs cannot do this. However the second way known as a software overclock (using clockgen)can be done.

My current processor can be overclocked and undervolted as adinu pointed out, I even overclocked my old celeron M in my previous acer using the very same clockgen program. In order to do this all you have to do is as baddogboxer pointed out and find the correct PLL for your processor and yes the ones on clockgen's webpage work with notebooks . As for undervolting P4's AFAIK the voltage of P4s cannot be manipulated like you would for a intel core, pentium M or AMD turion and sempron. When I overclocked to 1.8Ghz I saw no temperature rises at all simple because I undervolted at the same time. All of this is done using a software overclock so it won't work outside of windows but really people aren't doing much outside of windows or any other OS.

As for the original poster who asked if you can underclock a processor; did you mean like dynamically using speedstep or using the same clockgen program? If you mean dynamic speed changing then no as the P4 that you have isn't capable of doing this. You can try* to use clockgen to lower the CPU speed but with my past experiences of trying this, it never works. As soon as I carried the default speed down by as much as 50mhz the computer would instantly freeze. IMHO undervolting is a more stable means to lower temperatures.

 

Do mobile P4s not have dynamic switching? Even mobile PIIIs could be be limited in speed using something like RMclock by limited which multiplyers can be used.

I've been testing clockgen with my Celeron and I can't underclock. Managed to overclock to 1.8GHz and haven't tried further, but I don't really want to overclock, I'd rather underclock.

 

The BIOS won't report a change because clockgen (and other software clocking tools) are just that - software. Meaning the overclock only gets applied after the OS has loaded.

Why does every kid with a keyboard and an internet connection think they have been blessed with secret knowledge that only they possess and it is their sworn duty to share it with the world, but always choose to do so in a snobbish, condescending manner?

Plenty of OEM systems and aftermarket motherboards that do not allow for clocking in the BIOS can be o/c'd, it all comes down to the choice in PLLs. Saying otherwise just shows you've never tried before, or have only tried on a limited subset of systems.

THG is for nurbs. I stopped reading THG before this millenium. Try a real hardware site like Beyond3d, Realworldtech, Techreport, Ars Technica, Hexus, X-bit, or Bit-tech.

 

Ok, flame war over please guys let's keep it civil and on topic!

So far no-one but me has actually tried to help the guy, all you guys can do is rant about overclocking which is NOT the topic of discussion here.

ON TOPIC please or the thread will be closed.

Oh and I don't think you can underclock with clockgen, I just tried.

 

so wait is this a P4 in a desktop or a laptop. i know hp used to have P4's in their laptops but isnt that gonna be incredibly hot?

 

I'm guessing that's why he wants to underclock. There aremobile P4s, many of them, I'm guessing it's one of those.

 

Hey moon angel I tried to help him out . From my checks the P4s that you find in notebooks that have HT don't have speedstep. If he had a P4-M then speedstep should be there but he has the mobile pentium 4 HT so it will be like the celeron m and only have on demand clock modulation(ODCM) which doesn't actually lower the clock speed but lowers the CPU core throttle speed, the voltage will also be locked. This was the same situation with my old celeron M. I see you also found out that clockgen cannot be stably used to underclock . Like I said before underclocking isn't exactly the best way to lower temperatures undervolting is.

 

Nothing works. Thanks for the help.

 

Hey, I tried

And you can, as long as you select the correct PLL and select a value which is useable (not all are useable). RMClock or Systool should allow him to dynamically force speedstep I believe. Playing with the PLL usually only affects FSB/System Bus.

Now technically hardware/software clocking goes like this:

Hardware level covers Pin/BSEL and PLL modding.
BIOS level and GUI level both are software, but most people tell which they are doing when giving details so as not to mix up the readers..

EDIT - RMClock will allow adjustment of ODCM and you an also monitor core throttle with it.