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P4 vs. P4M

H

Hard_Rocker

2[H]4U
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Jun 27, 2000
Messages
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Okay, I'm building a system right now in a very tight space. It'll be watercooled with a PASSIVE system, IE my radiator won't have air moving though it, it'll just... radiate. :p I've decided to go with a Pentium 4 (originally thinking Northwood) as it has, from most accounts, less heat output than a similar AMD processor. But I've noticed some Pentium 4 Mobiles are available on eBay, and I was wondering how they perform compared to the standard P4? They have less power consumption and less heat output which in my case is a good thing, since I won't be overclocking and just want everything as cool (IE stable) as possible. Should I even consider a P4M or just stick with a Northwood chip?

I should mention, for you to consider, that all-out performance isn't the most important to me... I'll probably end up with a board with on-board video :eek: but then again, that can't be much worse than my current Geforce 256. :p I'm not the gamer I used to be so as long as I can play UT and CS I'll be happy with it.
 
I hope you don't take this as a thread crap, but AMD Athlon XP-M processors can't be beat for power dissipation at a great price. Sure, Pentium M and Opteron HE/EE processors can do better, but ~35 W power dissipation for a 2500+ XP-M is very good compared to similar P4 or P4-M units and has comparable performance. They also sell for less than $100--try to find a P4 or P4-M at that price.

Anyways, consider it. I can give you some advice on the P4 route if you'd like, too.
 
Originally posted by xonik
I hope you don't take this as a thread crap, but AMD Athlon XP-M processors can't be beat for power dissipation at a great price. Sure, Pentium M and Opteron HE/EE processors can do better, but ~35 W power dissipation for a 2500+ XP-M is very good compared to similar P4 or P4-M units and has comparable performance. They also sell for less than $100--try to find a P4 or P4-M at that price.

Anyways, consider it. I can give you some advice on the P4 route if you'd like, too.
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Nope, not a thread crap.... I don't know anything about newer processors, I stopped paying attention after building my current (1.2ghz AXIA TBird) setup. I had a thread in General Hardware asking for opinions/facts about which processors produced less heat but not everyone goes there. Those guys told me P4 was the way to go. Feel free to stop in and tell me more about the XP-M, since this IS the Intel forum. :)
 
Go back to that thread; I posted referenced data that demonstrates otherwise. It's not that the Pentium 4 is a hot processor. Since you want something with the lowest practical power dissipation, you would be cheating yourself not to consider the other alternatives. For many other things, the Pentium 4 might be more suitable.

edit: I didn't initially realize you were the thread starter for that thread too ;) Well, the data is there, at least for the desktop XP. XP-Ms only run cooler than that.
 
Originally posted by xonik
edit: I didn't initially realize you were the thread starter for that thread too ;) Well, the data is there, at least for the desktop XP. XP-Ms only run cooler than that.
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Gotcha. Yeah, I started that one to decide which forum Intel vs. AMD I needed to post in, heh. Well, I think you may have just changed my mind, and I guess I need to get out of this forum. ;)
 
Why are you going water cooling but not overclocking? If you want a silent PC, go with something like Swiftech MCX478 or Thermalright SP-94 and stick a 92mm vantec stealth on it. I've got my whole system with only vantec stealths and I can't hear a damn thing coming from my PC.

As for the P4 vs. P4M, I wouldn't bother with a P4M. I think they only come in either 400mhz or 533mhz FSB and don't offer hyperthreading. Any Northwood P4 should be able to be passively water cooled though.
 
Mobile P4 with Hyperthreading starts at about 2.8GHz. The line between desktop based P4 laptops and Mobile P4 laptops has gotten fuzzy.

Check Intel's site and datasheets for the Mobile P4. It suprised me when I looked it up a month or so ago.
 
Originally posted by EarthwormJim
Why are you going water cooling but not overclocking? If you want a silent PC, go with something like Swiftech MCX478 or Thermalright SP-94 and stick a 92mm vantec stealth on it. I've got my whole system with only vantec stealths and I can't hear a damn thing coming from my PC.
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space... space... space... and then airflow. the case I'm using has VERY LITTLE space... like 2" top to bottom. then you factor in that the mobo is raised up a bit and the socket and the processor and... yeah, you end up with just over an inch of space between top of the processor and top of the case. Also there's hardly any airflow anywhere near where the processor will be in the case. I WILL use this case and as such it's really my only option. :)
 
The REAL P4-Ms will default to a multiplier of 12X when used in a desktop board, and so far I haven't heard of anybody being able to get it up to the full speed multiplier.
 
I don't know if they're even available on the open market, (I'm sure some little nowhere shop has a few of them...), but the Centrino might be nice in a cramped desktop... :)
 
The Pentium M ("Centrino") has limited compatibility with conventional ATX boards. You definitely need a board that is specially compatible with the Pentium M in order to work. Unfortunately, both the boards and the processors are very expensive to end users. Expect $300+ each for the motherboard and processor.
 
Personally, I'd either underclock a Barton or run a Tualatin. Close to Pentium M clock per clock, low power usage especially on the Barton, run about 1v and see what clock is stable, probably around 1.2-1.5GHz.
 
Originally posted by Hard_Rocker
space... space... space... and then airflow. the case I'm using has VERY LITTLE space... like 2" top to bottom. then you factor in that the mobo is raised up a bit and the socket and the processor and... yeah, you end up with just over an inch of space between top of the processor and top of the case. Also there's hardly any airflow anywhere near where the processor will be in the case. I WILL use this case and as such it's really my only option. :)
Click to expand...

Maybe a blowhole dumping cool air right above a
bare low profile hs
 
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