Some education plz?

[jmwpom3]

This is prolly a dumn question, but here goes anyways.
Is a mobile processor (eg. Mobile Athlon 64) just a desktop processor with reduced speces? (underclocked or whatever)
If so, would that mean you could use a desktop CPU and modify the clock rate downward to make it work? Or does that just defeat the purpose?

AMD Athlon64 3500+
Asus A8N SLI-Deluxe
1 GIG Corsair Dual DDR
2 x 74 GB Raptor HDs
NVidia6800 Ultra PCI-e
Dual Layer DVD +/-RW
PC Power & Cooling 510W PSU

 

[endyen]

All of Amd's A64, opteron, s754 sempron chips, are basicly the same. Just with different packages. Most of the s754 boards will work with A64-m chips.
The mobile chips seem to have been binned based on stability at low voltage.

 

[Crossbow888]

Usually a processor designated with "mobile" means it has a different socket type than that of its desktop variants. But the Mobile Athlons are also socket 754, so you should be able to replace your laptop's cpu with a regular socket 754 Athlon64.

<P ID="edit"><FONT SIZE=-1><EM>Edited by Crossbow888 on 04/19/05 01:40 PM.</EM></FONT></P>

 

[jmwpom3]

are the notebooks all 754 or can you get a 939 board for a laptop? Mine is a 2 Ghz 2300+/2000 bus; and the chart I saw labeled that as a 939 chip. But, it was a list of regular not mobile CPU's.
CPU-z should tell me which right?


AMD Athlon64 3500+
Asus A8N SLI-Deluxe
1 GIG Corsair Dual DDR
2 x 74 GB Raptor HDs
NVidia6800 Ultra PCI-e
Dual Layer DVD +/-RW
PC Power & Cooling 510W PSU

 

[endyen]

Not exactly.
All mobile chips can work on desktops, if you have the right board for it.
Most s462 boards will work with xp-m chips. (if you dont have multiplier control, the chip defaults to 6X)
Most S478 boards will work with P4m, and celeronm chips (though usually at reduced speed)
There are even a couple of mobos that work with the s479 PM chips.
A64-m chips work on some s754 boards.

 

[Crossbow888]

Yes CPU-Z will tell you what CPU you have. Maybe I'm just tired, but I still don't know what you are trying to do. Are you trying to lower your laptop's CPU speed?

 

[jmwpom3]

LOL
No, I'm just trying to understand the ins and outs of mobile cpu's n boards. Wondering how upgradeable they really are/aren't, and the best methods of doing so. I'm new to the world of laptops, and it's in my nature to want to immediately tear it apart and figure out how it works, and how to make it better.


AMD Athlon64 3500+
Asus A8N SLI-Deluxe
1 GIG Corsair Dual DDR
2 x 74 GB Raptor HDs
NVidia6800 Ultra PCI-e
Dual Layer DVD +/-RW
PC Power & Cooling 510W PSU

 

[jmwpom3]

Yeah, I guess actually I was looking more the other direction, from desktop to laptop. eg: can a normal desktop processor go in the laptop and/or what's the most affordable option for speeding the laptop up? And, maybe, there is no great way other than a different laptop. Just looking for possibilities


AMD Athlon64 3500+
Asus A8N SLI-Deluxe
1 GIG Corsair Dual DDR
2 x 74 GB Raptor HDs
NVidia6800 Ultra PCI-e
Dual Layer DVD +/-RW
PC Power & Cooling 510W PSU

 

[jmwpom3]

?
You threw me. Are you saying that the mobile chip can be oc'd in the laptop and that would be cheaper than going to a desktop chip? Or maybe just that theyre really the same chip? (which I was aware of) Really just looking for the most cost effective option for the laptop: A64M or A64 cpu and the best method for implementing that.

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[BrentUnitedMem]

I thought that some mobile CPUS have totally different architectures than desktop CPU.

I was under the impression that mobile CPU is much much more efficient that the same rated desktop CPU.

Maybe it's true only for Pentium M

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[jmwpom3]

Well, for the purpose of this post, I'm really only talking about Athon 64M and/or Athlon 64's. I still haven't really figured out if mine is 764 or 939 but I think it's 939. (unless of course I'm wrong and they don't make a socket 939 board for a laptop config yet )
But that's the kind of stuff I'm trying to find out.

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[endyen]

Maybe it's true only for Pentium M

Mostly true.
All mobile chips are exceptional because they operate at a lower voltage, get hotter without frying, and are generally very stable. They are generally cut from the best areas of the die.

 

[endyen]

Most non-m chips have a bit of trouble working @ the lower voltages. They also have problems with TDP. A laptop isn't the best environment to cool chips.

 

[jammydodger]

There are even a couple of mobos that work with the s479 PM chips.

I can only think of one and that is because it comes bundled with an adaptor card, the motherboard itself is not compatible.

 

[jammydodger]

There are even a couple of mobos that work with the s479 PM chips.

I can only think of one and that is because it comes bundled with an adaptor card, the motherboard itself is not compatible.

 

[jmwpom3]

so, basically, since the mobile chip in the machine is prolly better than a comparable desktop chip, would overclocking it be worthwhile? (any noticeable performance increase)
Or, do the voltage requirements really rule that out?

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[endyen]

Most people dont OC mobiles because of the extra heat. Those puppies dont have great cooling, or space to put a big hsf.
With most laptops, performance can be gained by changing to a faster hdd, and adding more ram.

 

[endyen]

I guess you are talking about the Asus boards (though the adapter will work with more than one), so I guess you forgot about the Aopen board. (someone else, maybe biostar makes a different board as well)
Not that I care, the chips are too expensive for me.

 

[jammydodger]

There are 2 different mobile P4 chips, the pentium 4 mobile (bastically an undervolted pentium 4) and the pentium 4m which is a completly different chip alltogether (its like an upgraded p3).

 

[endyen]

AFAIK only the PM uses s479. As I said, Asus makes an adaptor that enables some of thier boards to run the PMs, while Aopen has a desktop board that supprts the PMs natively (s479)

 

[jmwpom3]

Yeah, that's kinda what I figured. So as far as the actual CPU, it's prolly just go with a new faster M or new laptop in general, once the HD and RAM are at optimum speed/size.

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[jmwpom3]

HMM, I thought I already made this reply, but it's not showing on the thread, so here goes:

With most laptops, performance can be gained by changing to a faster hdd, and adding more ram.

I was aware of all that, just looking for possibilities. But, as I kinda figured, It seems that the answer here is just get a faster M-CPU or just new laptop, as opposed to trying to squeeze more out of the current CPU. And with the price of the high-end CPU's, new laptop is almost better option I think. (not now of course, but when the time comes)


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[endyen]

Dont you mean you want a laptop with an external U320 connector so you can run a scsi raid?

 

[jammydodger]

Aopen has a desktop board that supprts the PMs natively (s479)

Isnt that board based on the 855 chipset? If so it would be far too expensive, under perform and lack features.

If I were to buy a PM (not that I would, I agree that they are too expensive) I would get the Asus board with the adaptor card.

 

[Mike_995]

Actually the Mobile processors seem to run a bit cooler, but other than that i am not aware that there is really a big difference