Picked up a Aspire 5551-2036 for $50

I don't plan to do a cpu upgrade soon,but grown curious about upgrading it.What cpu options do I have?
Here is the specs of the laptop:
AMD P320(2.1Ghz)
ATI radeon HD 4250(1405mb hyper memory?)
3GB DDR3(can handle up to 8GB)
320GB HDD
I just need to replace the screen & keyboard,& it will be good as new.Im on it right now using a dell external CRT.Runs really smooth & could not find any problems with it,besides cracked screen & missing keys of course.Suprised the guy let me have the HDD & charger .Battery is still good too.Lasted 2.5hrs when I was just surfing(not downloading stuff,not watching videos).

 

AMD M880G Chipset
AMD Phenom™ II triple-core mobile processor N830 (1.5 MB L2 cache, 2.10 GHz, 1333 MHz FSB, 35 W)
AMD Turion™ II dual-core mobile processor P520/N530 (2 MB L2 cache, 2.30/2.50 GHz, 1066 MHz FSB, 25/35 W)
AMD Athlon™ II dual-core processor P320/N330 (1 MB L2 cache, 2.10/2.30 GHz, 1066 MHz FSB, 25/35 W)

Acer Support: Acer Aspire 5551 Notebook Series Specifications

 

Thanks vulnavia!Would I need to get a different heatsink for correct alignment,or would my stock one be fine?I will get the phenom when I upgrade.
And combo it with 8GB ram.

 

Not sure. If I were to hazard a guess, i'd say the stock heatsink would be ok.

 

I noticed something odd.I usually have a fan running in my room and its kinda loud.I turned it off & noticed the fan in the laptop is not working right.I attached a zip file with a WAV sound file in it.It runs what you hear in the file till it hits 60*,then it stays on like it should.Soon as it gets below 60* it does exactly what you hear in the sound file.
What would cause this?

 

Sorry, I'm an old git (50+), I didn't hear nothin'. Can you give a general description?

If it's going bad (and i've had quite a few go on me), it will only set you back about $20.

 

Its ok.It is kinda hard to hear.Its about 25sec long.Sound doesn't start till 5sec mark.You can hear it jump(rpm kicks) 3 times.I left it running for the night,still does it.Hasen't had a thermal shutdown.I will probably get a new fan,just to have a backup on hand.
But I got a gut feeling its not the fan,I think its a sensor or something.Like its putting out the wrong rpm & not reading temps correctly.

 

Try running SpeedFan SpeedFan - Access temperature sensor in your computer

SpeedFan is a program that monitors voltages, fan speeds and temperatures in computers with hardware monitor chips. SpeedFan can even access S.M.A.R.T. info and show hard disk temperatures. SpeedFan supports SCSI disks too. SpeedFan can even change the FSB on some hardware (but this should be considered a bonus feature). SpeedFan can access digital temperature sensors and can change fan speeds accordingly, thus reducing noise. SpeedFan can find almost any hardware monitor chip connected to the 2-wire SMBus (System Management Bus (trademark belonging to SMIF, Inc.), a subset of the I2C protocol) and works fine with Windows 9x, ME, NT, 2000, 2003, XP, Vista and Windows 7. It works with Windows 64 bit too.