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Mobile Celeron on a desktop board?

M

m0bilitee

Junior Member
I've done some searching in the forums and with google, and cannot seem to muster up the right combination of words to find what I'm looking for.

Background: I use a Linux based firewall which mostly runs in RAM. Big CPU is not a problem. I'm replacing my unstable old K6-2 300 with a Socket 478 cube-pc I got on clearance. I'd like to run the quietest cpu possible, and am curious if the Celeron Mobiles can be run in a standard socket 478 board? (I've done it with mobile Athlons, so please dont' point me in that direction. 🙂 ). I understand you might have to bend a pin to do this.

Can anyone give me some pointers or a link to somewhere this has been done? Ideally I will run a mobile chip then underclock it to run on air cooling.

Gratzi!

M0b
 
Glad to see someone with the same question.
I have a 1.5ghz mobile celeron that I am running @2.6ghz on a shuttle xpc sb51g. Worked the 1st time i poped in the cpu. You will have to disable any thermal protection on the mobo before doing that. However, I ran kind of hot for me, in the 50c. So, I am trying to look for a cheap 845 chipset mobo that i can attach the hs to the mobo which suppose to work better. And oh, i am at the max fsb that shuttle would allow 132.
 
Karaktu is the resident expert on Mobile celerons. I would recommend PMing him and he can tell you how to mod your celly to run on nearly any desktop board. Also see a little info here.
 
I am currently using a P4 1.6 mobile (512k L2, not Celeron) cpu on an Abit AI7 w/out any mods. All runs well and it overclocks to about 2650mhz.
 
Originally posted by: KoolAidKid
Karaktu is the resident expert on Mobile celerons. I would recommend PMing him and he can tell you how to mod your celly to run on nearly any desktop board. Also see a little info here.
Click to expand...


Sorry, but i've beeing reading the thread you linked, and i'm confused about some specs.
Don't believe in all that is writen there, sorry.

I've been messing with a P4M 1.8 for the past week, and it's nowhere and "beautifull" has he paints.
Also, the chips on desktop board default to 12x multipliers, not the original one.
 
Should also note with respect to the AI7:

--12x multi as stormgiant stated, so you will need to be very careful in you mobo selection. 845PE will probably get you a high fsb and 865/875 boards will definitely get you there, but most other chipsets will not.

--I can't get the 1.3v selection for the cpu voltage, 1.5v is the lowest the AI7 will go. So something to consider there. It's cool under an SP94, but I was looking to go near silent with this one.
 
I'm not sure that I see the relevance of your P4M-related postings considering that OP asked about Mobile Celerons. According to this thread Mobile Celerons default to 20x in desktop motherboards, while P4Ms default to 12x. This is corroborated by a quote from this thread:

Mobile Celerons don't have "Enhanced Speedstep Technology" enabled so their
multipliers remain unchanged when located on a desktop mobo. Unfortunately,
the regular mobile P4-M's do, and default to "safe" and end up with a
multiplier of x12.

FYI.
 
Originally posted by: KoolAidKid
I'm not sure that I see the relevance of your P4M-related postings considering that OP asked about Mobile Celerons. According to this thread Mobile Celerons default to 20x in desktop motherboards, while P4Ms default to 12x. This is corroborated by a quote from this thread:

Mobile Celerons don't have "Enhanced Speedstep Technology" enabled so their
multipliers remain unchanged when located on a desktop mobo. Unfortunately,
the regular mobile P4-M's do, and default to "safe" and end up with a
multiplier of x12.

FYI.
Click to expand...

He's right. Mobile P4-Ms aren't really very desirable for desktop applications. Mobile Celerons are, IMHO. You might also take a peek at Dothans, though they're a bit pricey.
 
Originally posted by: KoolAidKid

Mobile Celerons don't have "Enhanced Speedstep Technology" enabled so their
multipliers remain unchanged when located on a desktop mobo. Unfortunately,
the regular mobile P4-M's do, and default to "safe" and end up with a
multiplier of x12.
Click to expand...

Ahh, learn something new everyday😉 Also, about the Dothan. Is there a desktop mobo that will take them? I was searching a few weeks ago, but came up blank.
 
Sorry, but both of your links are leading in oposite directions... one says that Celerons default to 20x multiplier, the other says that it maintains the original.

I'll be getting one to test in a couple of days, i'll let you know later.
But my P4M is only fast in generally windows tasks. When you get to cpu intensive apllications like DC projects or games, ohhhh deers... nowhere near the performance of the 3.0C... Don't know how you guys say that a Celeron rocks... and i'm running it at 234mhz fsb vs the 180/190 of the celeron's shown.


When I get the Celeron i'll be putting a simple comparative like the ones i'm building other... link. It's portugueses, but you can see the pics 😉

Let me upload the test between the P4M and the other desktop cpu's until the weekend.
 
Originally posted by: TStep
Originally posted by: KoolAidKid

Mobile Celerons don't have "Enhanced Speedstep Technology" enabled so their
multipliers remain unchanged when located on a desktop mobo. Unfortunately,
the regular mobile P4-M's do, and default to "safe" and end up with a
multiplier of x12.
Click to expand...

Ahh, learn something new everyday😉 Also, about the Dothan. Is there a desktop mobo that will take them? I was searching a few weeks ago, but came up blank.
Click to expand...


Yeah, i also have a 1.5 Banias ( 1MB ) for sale because no way to get it to work on 865/875 chipset mobo's 🙁
 
Mobile Celerons maintain their original multiplier. Some boards require a bent pin in order to recognize them, in which case they then default to 1.2v 2.65GHz seems to be about the limit at this voltage on a C0 stepping chip, at which point you need to raise the juice as far as 1.7v in order to hit up to 3.5GHz on a D1 stepping.

About 6-8 months ago, this was pretty hot considering the price Intel was charging for P4s. However, you can now get a 2.4GHz Prescott CPU (non-HT) for around $105 retail boxed, and these things typically do 3.2GHz at stock (1.4v) voltage. Considering that these have 4x the cache, they would be the way to go.

I still have a handful of 1.6 and 1.8 mobile Celeron CPUs that I've been doling out in systems ranging from 2.133GHz to 3GHz. They make excelling low power/heat configurations that are still fully able to run games (when combined with the right video card).

I use 1.6s overclocked to 2.5GHz in my two HTPCs.
 
BTW, here are my previous tests with mobile Celerons:

How fast can a Celeron really be?

Can you say FAST???!!!

Mobile Celeron 1.5 -> 3.0GHz with 2 x 256 PC3200 (6306) vs. P4 2.6C -> 3.45GHz with HT enabled and 2 x 512 PC4200 (6521)

Both were tested on exactly the same ASUS P4P800 Deluxe running 1:1 with Memory Acceleration Mode Enabled and Performance Mode set to Turbo with the same Radeon 9800 clocked at 451/340 with the same Windows XP load. Only the CPU and memory were changed (as indicated)!!!

No wonder Intel keeps these FSB-limited to 100MHz!
Click to expand...

However, Intel is now selling desktop Celerons starting at 2.53GHz/133 FSB with 256k cache, SSE3 and 0.9v, so the market has changed.
 
Originally posted by: BigBadBiologist
I've played around with some too, so if you have any specific questions let me know. Here's a little article that's kind of interesting with some links to modifying pins to get higher FSB. http://will.dashwood.me.uk/pentium4m.htm

I actually modded my mobile celeron 1.5 to have a 133FSB in my laptop (to get 2GHz) and it runs great.
Click to expand...

Nice article, that is what prompted me to try the mobile part in the first place when I came across it a month or two ago.
🙂
 
Originally posted by: KaraktuHowever, Intel is now selling desktop Celerons starting at 2.53GHz/133 FSB with 256k cache, SSE3 and 0.9v, so the market has changed.
Click to expand...
Correction. 2.4GHz/133FSB with 256k cache, yada yada. Model Celeron D 320. I picked up one at Fry's with an FIC 865P motherboard for $89 plus tax. CPU is running in my Asus P4P800 Deluxe at 3.6GHz on a 200/800FSB. The Asus board will regularly POST the CPU at 3.97GHz and an MSI board POSTed once at 4.01GHz with this CPU. It was everything that the mobile CPUs were not for me. Sorry Karaktu.
🙁 I ended up with a total of three of the mobile Celeron 1.6 chips (one directly from Karaktu, two indirectly). The chips seemed to run fine in the Asus P4P800 Deluxe with about a GHz overclock. Other boards wouldn't POST or had issues. For instance, my Asus P4S800 will only POST once, then will do an immediate shutdown on subsequent POSTs unless I turn off the switch on the power supply for a few seconds, plus it didn't want to overclock. Kinda a waste of some overclocking potential, but I sold one with a Shuttle SS51G to a friend. It is running flawless in that mini system at somewhere around 2.2GHz.

I suppose I can get off my lazy ass and mod my two remaining mobile Celerons so that they work in more boards. :laugh: However I'm having too much fun with my Celeron D that just plain works in all boards that I've tried it in with no fuss. Perhaps when I'm bored and need a challenge...

I don't really regret the money spent on those mobile Celerons. They were cheap and gave me a few hours of entertainment, plus I'm using one on my HTPC in the Asus P4S800 (just gotta turn off the power supply switch after Windows shuts down).
you can now get a 2.4GHz Prescott CPU (non-HT) for around $105 retail boxed
Click to expand...
Fry's often advertises them at $109 with an ECS 848 chipset board.

Oh yeah, back to the original topic...
I'd like to run the quietest cpu possible, and am curious if the Celeron Mobiles can be run in a standard socket 478 board?... Ideally I will run a mobile chip then underclock it to run on air cooling.
Click to expand...
Since the mobile Celerons are already at the lowest FSB setting, you can't underclock them. Best you can do is to make sure your motherboard supports lower voltage, something like the 1.2 or 1.3v that is the default. Seems like some of the Asus boards support that. Otherwise, for underclocking you'd have to use a CPU that defaults to a higher FSB, meaning no mobile Celeron. Perhaps the Celeron D...

Speaking of the Celeron D chips (again) why not slightly abbreviate the name, call it a Deleron?. Just remember... you saw it here first. 😀
 
Originally posted by: Zap
Originally posted by: KaraktuHowever, Intel is now selling desktop Celerons starting at 2.53GHz/133 FSB with 256k cache, SSE3 and 0.9v, so the market has changed.
Click to expand...
Correction. 2.4GHz/133FSB with 256k cache, yada yada. Model Celeron D 320. I picked up one at Fry's with an FIC 865P motherboard for $89 plus tax. CPU is running in my Asus P4P800 Deluxe at 3.6GHz on a 200/800FSB. The Asus board will regularly POST the CPU at 3.97GHz and an MSI board POSTed once at 4.01GHz with this CPU. It was everything that the mobile CPUs were not for me. Sorry Karaktu.
Click to expand...

Not sure why you're apologizing; you seemed to have reinforced my point! 😉

BTW, it seems that high FSB mobile Celeron overclocking is highly dependent on the RAM you use. Corsair Value Select has never failed me, but Kingston ValueRAM is about 40/60.

Thanks for posting about the 2.4 "320"...I was wondering how well they overclocked. What voltage did you have to use to get it up to 3.6?
 
Originally posted by: Karaktu
Originally posted by: ZapIt was everything that the mobile CPUs were not for me. Sorry Karaktu.
Click to expand...
Not sure why you're apologizing; you seemed to have reinforced my point! 😉

Thanks for posting about the 2.4 "320"...I was wondering how well they overclocked. What voltage did you have to use to get it up to 3.6?
Click to expand...
That apology was a tongue-in-cheek nudge-n-wink because I don't want people to be scared off from buying your remaining stock of these mobiles since some have gotten great results.

Heck, I don't know what voltage I set for the Deleron 320. The machine is not hooked up right now and 1:30am is too late to be messing with it - I've already turned into a pumpkin for the night. I didn't even realize that the voltage was supposed to be so low. I think I basically set the voltage to the highest the board allowed, around 1.6V. Since I seem to be held back at 3.6GHz by my use of a SATA drive, perhaps I'll start testing lower voltages. I do know that it seems completely stable. Haven't run stuff like Prime, but it has gotten through a Windows XP install (never underestimate...) and a weekend LAN party, plus some various benchmarks with no known glitches.
 
Great info guys. I've learned a ton. Basically I'm lead to believe that I want to be serious about an underclock and fanless operation, I best find a nice mobile athlon and go down from there.

 
Yup, yup. Not that it is impossible with the mobile Celerons, just that you have a better chance of a mobile Athlon working in a desktop board than a mobile Celeron working in a desktop board. Just don't get the mobile Athlon XP 2000+ as those are NOT socket A chips.
 
It appears to, though automatically.

CPU-Z shows the actual default CPU voltage as bouncing between 1.628 and 1.680v

I've been able to get a moble 1.8 stable at 3.15GHz with this board. I'm going to try another PSU and see if that stabilizes the CPU voltage at all. If not, it's going to take a hand-picked CPU to his 3.2GHz here.
 
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