Dell Latitude C640

loltim

loltim

loltim

Soldato
Joined
21 Oct 2002
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Wellington, NZ
Old laptop I know but its great, perfect for what I need it for:)

I was just wondering if I can downgrade the CPU? it's got a 2.4ghz pentium M in it atm which keeps the fan spinning which can get quite loud, sucks battery power too!
or maybe underclock it?

Noise is the main problem as being honest, battery life is great. I got rid of the cdrom for a secondary battery so it seems to last forever:p
 
Hmm theres no real way of upgrading or downgrading the cpu in laptops mate, and its quite doubtfull your able to change the clock speed on them.

can always get a laptop cooling mat.? and try and clean out the fans.?
 
I'm pretty sure that the speedstep is enabled on those anyway...not much you can do other than get a mat like Kenny states Or flog your laptop and build yourself a decent pc ;):)
 
Didn't think they made a 2.4GHz Pentium M... if you can prove it, feel free to wing it my way if you want to swap it with a 770 ;). Otherwise, try undervolting it using something like RMClock.
 
cpu.jpg


Yeah looks like speedstep is on here. I've already got a decent PC badger.

Are we saying that Dell C640's cpu is not changeable, and is soldered onto the motherboard? Whats a 770?

edit: ok so 770 is a different socket. Couldn't I just change it with this for example? http://cgi.ebay.co.uk/Intel-Mobile-...14&_trkparms=72:1301|66:2|65:12|39:1|240:1318
 
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Get yourself a copy of NHC (notebook hardware control) and see if you can adjust the voltages for each step of speedstep.

That is already clocked about as low as it will go, but the voltage on the P4m's stays quite high from what I remember.

Odds are, if the motherboard was designed with P4m in mind, the BIOS won't have the microcode for Pentium-M (and thus Celerons based on the same core, such as the one in your ebay link). P4m was a cruddy technology (essentially a lower clocked Northwood P4), which was swiftly replaced with Pentium M (which the "Core" microarchitecture was developed from).
 
I upgraded the CPU in my Advent 7082 by replacing the 2800+ Sempron with an Athlon 64 3000+ (desktop chip).

Had to remove the heat spreader on the CPU, but it went straight in and worked well... got a little toasty which like on your laptop Tim, kept the fan spinning.

So, it is possible to do :)
 
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