Which low-power Socket-P cpu for my laptop?

Hi guys, I just bought a "HP 550" laptop, which mount a "celeron m 550" 2ghz single core and a x3100 intel as vga. The chipset is a GLE960, and as Everest Ultimate report,should support up to 800mhz of FSB.
As the Celeron M 550, doesn't have any geatures to reduces voltage and clock, I would like to replace it with a wiser cpu from a power-consumption perspective. I don't mind to get a more powerful cpu, I just want a cpu which consume less at idle and at load compared to the celeron M 550, and possibly with a price below 100 dollar. Which option do I have?

 

You have a good chance of being able to use any Socket P CPU. While the GL960 doesn't officially support anything more than a Pentium Dual-Core, most are able to run T8x00s and T9x00s without a problem.

That being said, there are a few T8100s that have gone below $100 on eBay; if you're lucky you can get your hands on one of those. Otherwise, I'd probably go for a T7100 or T7300 which almost always go for less than $100.

 

Confirm BIOS Support before upgrading. The HP 550 is a new laptop, and might have very few BIOS updates.

 

Ooh wait pick me! I have a T7300 I'm selling from my old Sager NP2090. It's still sitting in its socket. Under $100 is reasonable.

Edit: I don't think many CPU's are more power efficient than the celerons except for the Pxx00 series, and you definitely will have a hard time getting one of those for under $100...

 

And the Pxx00s are only for the 4 Series chipsets.

 

The most power efficient chip the OP could get is the T8100.
But that is going to be over the $100 limit.
Your best bet is the T7300 the one guy mentioned that he is selling. That is a great price for that chip.

Any core based processor will be more power efficient than the celerons. The celerons have no speed step, so they are always running full speed, eating up battery life and dumping out lots of heat.

K-TRON

 

Interesting tidbit, didn't know that. I just assumed Celerons had a lower TDP-- I suppose that's what I meant by efficiency. I'm sure any Core cpu would put up an overwhelming fight watt for watt, though.

 

I was thinking of a T5270 which should run at 1.4ghz and is sure to be compatible (some models of the HP 550 mount this cpu).
This cpu is not 45nm, but at this frequencies should be quite low on power .
Alterntive seems to be the new intel t4200 which is 45nm.

 

Actually Celerons are cheaper because they don't have all the power saving technology in them and what not. They don't automatically underclock like the "standard" processors do either.

 

What celerons are terrible on power anything is better then them even AMD's.

 

Just so you understand
Tippey meant to say:

What???, Celeron's are terrible on power. Anything is better then them, even AMD's.

K-TRON

 

And here I was thinking they just had less cache and a few missing instruction features.

Not AMD's! *gasp* /sarc
Good to know though. Now that I Wikipedia'd it I realize I was even wrong about the TDP being lower. Fail all around for me, lol

+rep for teaching me something.

 

Celerons have a lower TDP mainly because they are single-core.

You install a Celeron in a notebook that has a good cooling system, will result in a lower load temp for the Celeron - so you won't need to undervolt it anywayz.

Undervolting helps in reducing the TDP of a CPU, therefore lower load temps.

 

The fact is that I cannot underclock or undevolt this cpu. I tried rmclock and crystalcuid, neither of them seems to work.

 

I was wondering if atom cpu are compatibile with socket-p.Does anyone knows about that?

 

Atom is on its own platform and uses a different form factor than Socket P.

 

The fact is that Celerons have a lower TDP than dual-cores, so you don't really need to undervolt them. And underclocking a CPU is more of a handicap to performance.

A cooling system that is good enough to keep a 35W TDP CPU cool, will keep a 30/31W TDP CPU cooler.

Anyway, a Core 2 Duo is in a league of its own, and the performance figures of a C2D exceed those of a Celeron, so upgrading to a similar spec'ed C2D will give a good boost in performance, and if you get a good chip, you can undervolt it well to reduce its TDP.

 

well celeron single core has a tdp of 30w, as many core duo, but with a big difference:it runs at full speed and voltage constantly.So I wouldn't say that it has a low tdp.

 

The TDP will never exceed 30W. People who have Celerons, usually don't even think about running CPU-intensive tasks, which would fully stress the CPU and make it reach its theoretical TDP.

What I mean is that if a notebook's cooling system is good enough to keep a Core 2 Duo's (35W) max temp in the 70s (Celsius), installing and stressing a Celeron M (30W) in that same notebook will result in a lower load temperature of about say 60-65*C....

The advantage of a Core 2 Duo or PDC is that you can get undervolt it, and drop the 35W TDP by a good 5W, depending upon the undervolt, and therefore bring down the load temperature from the 70s into the 60s (similar to the Celeron).

EIST does help a bit in improving battery life, but again low voltage@low frequency isn't that useful as compared to low voltage@high frequency when the CPU is being stressed and actually being used. When the CPU is downclocked due to EIST, the low voltage at that multiplier doesn't help in improving battery life (alot) since the CPU is not being used by the OS.