Mobile Pentium 4 in desktop mobo

[rhetor]

Hey guys,

I have a dell inspiron 9100, which uses a p4 Prescott 2.8ghz.

The mobo is an intel 865PE. This is simply a desktop system crammed into a small space.

Anyhow, i was hoping to get more battery life, and have hopefully stumbled on a way to get a faster processor and hopefully more battery life.

The newer Mobile Pentium 4 processors come in flavors up to 3.46ghz. The power usage is the same, but they can throttle down. These new procs use a new intel speedstepping which aparently is software controlled

I'm hoping this means that a chipset that supports a 478 p4 will support these mobile chips.

Does anyone know if this will work? My bios is locked thanks to Dell, but i'm hoping that because of the new speedstepping, it won't matter.

The only downside is these cpus only have 533mhz bus speeds while mine is currently an 800mhz with HT.

[Evilsizer]

well the only way to get more batteir life is to either buy a bigger type battier. Second is to slow the cpu down...reguardless of the P4 cpu you are looking at the only way for more is to slow it down. p4 "netburst" arch. is only good at high speeds. i personally would stash the cash and wait a bit to see if any ad's in the papers show a Cely-M lappy for 399. i saw one during xmas not sure if they might pop up agian. the cely-m is based on the dothan core which is more energy friendly. does lots of work at slower speeds by the design of the cpu arch. Really for a more future type laptop with good battier life look at some that are poping up in ad's i think they are going for 799. its duel core "yohan" core use the same amount of power as a single core dothan cpu.

[rhetor]

Thanks for the advice.

I am on the same thinking level as you. I just got my new battery from the UPS man a few hours ago. My old battery was only charging to 54%, and was 6450mah.

I ordered an 8900mah battery. Considering the huge capacity of this, I think it can go for quite some time.

Maybe you didn't catch my full intensions of the Pentium Mobile.

I'd like to throttle it. The RMclock program has some really sweet features. It will throttle the CPU based on your settings. When the AC adaptor is plugged in it will run at 100% throttle, and when unplugged it will automatically throttle based on CPU needs, or based on your settings.

As an added benefit i could throttle it when plugged in. Using the program I could make it throttle down when the cpu is under 20% load (like at idle conditions) and go back to 100% when its being used. This would save on heat and noise (laptop).

Now all this would be fine and dandy if it works.

So i guess the real question is whether anyone has tried one of these new Mobile Pentium-4 cpus using a desktop board. The new enhanced speedstepping should work.

[Evilsizer]

they have but the multi is only 12 no changing it...since eist did not start being used till lga77 socket irc. rmclock might work the change the multi upwards but from what irc it never did. i wouldnt count on it doing it now.

[rhetor]

So the newer mobile p4's still operate by changing the multiplier, and if i have a locked bios, it will not change the multi?

[Shelnutt2]

You can do a search for P4-M here..but it goes like this.

P4-M's had an early early version of EIST. Basically they can run at full multi or at 12x multi. They are all northwood based chips. The problem with these are that in most desktop board when you drop them in it drops the multi down to 12x and your basically stuck there. There are a few desktop boards that allow you to run at the 12x multi or the full multi. Its really hit and miss.

[rhetor]

I had searched and read a number of posts on the forums.

It was my understanding that before the P4m changed names ever so slightly, they used the "min/max" speedstepping. From more reading i found that the newer p4m or mobile pentium 4 had software controlled speedstepping, or Enhanced Speed Stepping, and that the multipliers were controlled at the cpu level:

6.3 Enhanced Intel SpeedStep® Technology

The processor will feature Enhanced Intel SpeedStep technology. Unlike previous implementations of Intel SpeedStep technology, this technology will enable the processor to switch between multiple voltage and operating frequency points instead of two. This will enable superior performance with optimal power savings. Switching between states will be software controlled unlike previous generation processor implementations where the GHI# pin was used to toggle between two states. Following are the key features of Enhanced Intel SpeedStep technology:

• Multiple voltage/frequency operating points provide optimal performance at the lowest power.
• Voltage/Frequency selection will be software controlled by writing to processor MSRs (Model Specific Registers) thus eliminating chipset dependency.