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Sweet... OC'd the Pentium M

B

bobsmith1492

Diamond Member
So I googled 'overclock "pentium m"' and came up with the CPUID site. They had a clock generator for the DFI P-M board, so I figured, 'eh, what the hey' and loaded it onto my Sager Centrino lappy. Whaddaya know; it works!

Edit: Ok, I bumped it up to 104 FSB, which of course changes all the other busses as well and I'm running Prime now. Also, the 2.0 proc was available when I bought this, so does that mean this thing's cooling theoretically could handle up to 2.0GHz?

UPDATE: Ok, I just set it at 125 FSB (25% FSB OC, w/ no lock) and it's still chugging; no signs of failure except the sound, as mentioned below. 2125.5 MHz 🙂

I guess that's the limit, but I suppose 25% isn't bad, especially for a laptop.

System:

Sager 3790
P-M 1.7
1 gig PC2700
60 gig, 7200RPM HDD
128 MB 9700 mobility
1920x1200 WUXGA display (yummy!)
 
I think it could go up to and past 133 mhz. I'm pretty sure the 533 FBS and 400 FSB chips use the same socket and chipset. I'm not sure though so don't listen to me.
 
If that worked, maybe your should try Clockgen.

The DFI 855 board is supported there too. If the agp frequency doesn't change when you are upping the fsb, the AGP/PCI clocks are probably locked, so good to go without too much worry about corruption. I would imagine the memory you have is at least PC2100, so that should be good for fsb=133. have fun.
 
Yeah, that was Clockgen I used. However, none of the frequencies are locked; the PCI is only up by 2% now though. I figure if it could handle 5% (sounds reasonable) the I could pump it up to 1.82 GHz, from 1.7. Interesting stuff.

Anyway, my only concern is that the PCI bus might mess up and corrupt things. I made a sys restore point and could reformat if I HAD to, but would rather not.

Also, the ram is indeed DDR333, but with this being a Centrino/Intel/proprietary laptop thing, there are no controls for anything, and the ram multiplier is at 5:3 so when the FSB is 100, the ram is 333, which means at 1.82 GHz (107 FSB) it would be up to 179 MHz.

Anyone know the safe upper limit (percentage or frequency-wise) for the PCI bus? In the laptop it's only 17 MHz to begin with, or 1/5.88235294117647 times the FSB.
 
Back in "the day" with intel BX motherboards, I often jacked the FSB up to anywhere from 12 to 15 percent without problem. That puts the PCI in the 37MHz range. Some of these machines also had SCSI controllers which are very picky. In your case, the ram would be in the mid 180's and the CPU would be in the 1.9GHz range.

I've never OC'ed a lappy though!

Joe
 
It should be 33mhz... anyway, I imagine you wouldn't get any problems running it at something like 45 mhz (that'd probably show up as 22.5 for you, since it seems to be dividing by 2), but you might. Just give it a shot... chances are the worst that could happen is you will have to reboot.
 
Yup; but like I said, this model was available with up to a 2.0 GHz when I bought it, and I only got a 1.7, so I'm pretty sure there's some headroom there.

Anyway, it's up at 1.905 now, or +12.1%, and I ran Prime overnight at +10%. 🙂

What would be the first warning signs of an out-of-spec PCI bus? I figure maybe the sound, video, or hard drive.
 
Ok, quick update:

I found the limiting factor - the sound card. The sound disappeared at around 1.9 GHz. So anyway, I figured out how to circumvent this problem. I simply uninstalled the built-in sound card and hooked up a lil' USB audio thingy that came with my minidisk.

Right now I'm priming at 2004 MHz while listening to music and running a DC project and typing this and running RTHDRIBL, and thing are running great! (except Prime uses like 2 gigs of ram, so things are a bit slow)

Anyway, moral of the story: 1.7 to 2.0 GHz, Pentium M in a laptop 🙂

I'm excited, but not sure if it's worth it to try for more.
 
Thanks 🙂

The real question now is what happens if it's running on battery only?? Oh well.

I like your sig by the way; he was a good man.
 
Seems as though you have reached the limit on your PCI components bus speed at 37mhz, somewhat expected without locks. Now I don't know how the 855 chipset handles pci dividers, but from the days of yore, alot of the chipsets reverted to a /4 divider at fsb=124mhz. If your cpu and PC2700 have the headroom, and the stars are in alignment for you, you may be able to work around the pci bus.

If the chipset engages a /4 at fsb=124, you would have:

P-M @ 17x124 for 2108mhz (within the realm of reason)
PC2700 @ 124*5/3 for 207mhz (maybe stretching it a bit, but you never know)
PCI bus back within spec 124/4 for 31mhz

Might be worth a try🙂
 
Well, I tried it; I bumped the FSB up to 125. However, the PCI didn't lock down as far as I can tell, although CPU-Z doesn't say, so there's no way of knowing I guess. It works though; that's a 25% OC, everything stock (except the sound 🙂) Priming now.
 
Thats awesome bob. This is the first I've heard of people overclocking PM on their lappys. I guess you saved like $300 by not getting a 2ghz dothan.

I dled the Clockgen for the PM mobos and ran it, but it reads the wrong clock and it allows me to move the scroll and set new clocks, but it doesn't actually set them: cpu-z still reads 1594.9. I can even put the scroll in clockgen all the way to 8000 mhz, and it allows me to set it, but it doesn't actually change the clock.

I'm running a Dell i8600 with a 1.6ghz dothan cpu. Any Ideas?
 
Well, CPU-Z says my chipset is actually the same as that used in the DFI board, so that might be why. Check what chipset you have under CPU-Z Mainboard tab; mine is the Intel 852/855GM, while the DFI board is like 855G, so I'm guessing they're pretty similar.
 
wonder if it's worth me try 2o'c my toshiba satellite with a smokin (@stock 😛) 333mhz AMD "Chomper" 😛

Awesome o'c 4 a laptop 🙂
 
get HL2 and let me know how you guys handle it on that intel 855 card 😉 I've done it and its not very playable, hehe...
 
Yeah right... I'm not paying 55 bucks for another FPS. You know how many candy bars you can buy for that much? At least 110.

110 candy bars... HL2.....

Not much of a choice for me 🙂

My roomie has it though, so if its possible, I might see if I can borrow it and test it out.
 
know any generator for a dell inspiron 9100?

I try the intel board with the i865 chipset but it crashed. here's my cpuID


CPU-Z version 1.26.


CPU(s)
Number of CPUs 2 (1 Physical)

CPU#1 APIC ID = 0
CPU Name Intel Pentium 4
Name Intel Pentium 4
Code Name Prescott
Specification Intel(R) Pentium(R) 4 CPU 3.00GHz
Family / Model / Stepping F 3 4
Extended Family / Model 0 0
Package mPGA-478
Core Stepping D0
Technology 0.09 µ
Supported Instructions Sets MMX, SSE, SSE2, SSE3
CPU Clock Speed 2992.6 MHz
Clock multiplier x 15.0
Front Side Bus Frequency 199.5 MHz
Bus Speed 798.0 MHz
L1 Data Cache 16 KBytes, 8-way set associative, 64 Bytes line size
L1 Trace Cache 12 Kµops, 8-way set associative
L2 Cache 1024 KBytes, 8-way set associative, 64 Bytes line size
L2 Speed 2992.6 MHz (Full)
L2 Location On Chip
L2 Data Prefetch Logic yes
L2 Bus Width 256 bits

CPU#2 APIC ID = 1
CPU Name Intel Pentium 4 (logical unit)


Mainboard and chipset
Motherboard manufacturer Dell Inc.
Motherboard model 0W1450,
BIOS vendor Dell Inc.
BIOS revision A05
BIOS release date 11/01/2004
Chipset Intel i865P/PE/G/i848P rev. A2
Southbridge Intel 82801EB (ICH5) rev. 2
FSB Select 800 MHz
Performance Mode disabled
Graphic Interface AGP
AGP Status enabled, rev. 3.0
AGP Data Transfert Rate 8x
AGP Max Rate 8x
AGP Side Band Addressing supported, enabled
AGP Aperture Size 128 MBytes

Memory
DRAM Type DDR-SDRAM
DRAM Size 1024 MBytes
DRAM Frequency 199.5 MHz
FSB😀RAM 1:1
CAS# Latency 2.5 clocks
RAS# to CAS# 4 clocks
RAS# Precharge 4 clocks
Cycle Time (TRAS) 8 clocks
# of memory modules 2
Module 0 OCZ DDR-SDRAM PC3200 - 512 MBytes
Module 1 OCZ DDR-SDRAM PC3200 - 512 MBytes

Software
Windows version Microsoft Windows XP Professional Service Pack 2 (Build 2600)
DirectX version 9.0c
 
Dell i9200 uses ICS 950810, so no overclocking unless PLL chip is replaced.

Anyone know of a good sub that will work?
 
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