Greetings!

As PATIO pointed out, LONG TIME NO see . Schools a pain and my brothers complaining his laptop is SLOOOOW. Now considering it was a free gift i cant complain, but its a Toshiba Satellite.(Ill list the full specs at the bottom) Anyways its AMD athlon is slow and when i opened the RAM compartment i NOTICED the CPU is removable. SO i was wondering, what CPU upgrade can this thing handle?

Toshiba Satellite L645D
AMD athlon P340 @2.2Ghz
4GB DDR3 RAm (2x 2Gb sticks)
500Gb seagate Barracuda (i think)
AMD onboard graphics, not 100% sure which one.
Ran windows 7 Home, now running windows 10 Home.

Any suggestions are acceptable. Thanks In the BIOS does it specify a version rev?

You probably wont find a CPU that is much better that it already has. Additionally the GPU is weak with the Mobility Radeon HD 4250.

Unless your doing something that is computationally intensive, I am willing to bet that the CPU is probably not your trouble spot for performance and its really your GPU that is holding back your performance.

I have a Satellite with the Athlon II 2.0Ghz with M300 Radeon GPU and the GPU is what caused me to retire it from gaming. Its pretty sad when a Celeron M1000 1.8Ghz with Intel HD Graphics laptop performs better than the Athlon II 2.0Ghz with M300 graphics.

I wouldnt bother with a CPU swap if this was my own laptop. If you want to game with it its best to invest in a newer laptop.I agree with Dave, a CPU upgrade isn't likely to make that much of a difference in general usage - I'd recommend upgrading to an SSD if you want to have the machine feeling more snappy in loading programs etc.Although i agree that the GPU is just as pathetic as the CPU, no one said anything about gaming. My brother simply uses this machine as a web browsing and word, powerpoint machine. Gaming on a laptop in my opinion is just something that shouldnt be done. I wanted a CPU swap because i know i can get one even free if i wanted. BUt not sure how to go back finding out what this machine can handle.

Im used to using previous gen machines and maximizing their power. My backup machine is an old IBM that has a 1.8GHZ core 2 duo with a 2mb cache and is previous gen machine that has DDR2 and smokes this toshiba out of the water. I get the toshiba was probably a walmart machine but there has to be a better cpu for it. I'd research to see if there is a BIOS flash for this laptop. If you find a flash for it it might state the support list of CPUs. Otherwise if no newer flash is available then knowing the bios version might give insight into what that version specifically supports.

Biggest issue will be heat dissipation of a faster performing CPU. You will want to stick with a CPU that is the same TDP. If you can get one free and dont mind taking the chance of killing the laptop you can have at it. The suggestion that Calum had with the SSD is one sure way to get a performance gain, and if the laptop dies and doesnt kill the SSD with it then you can move the SSD later to another laptop or desktop etc.

Laptops should never be compared to Desktops as for Desktop CPUs just about always outperform. Even todays Core i3,i5, and i7's the Desktop Version generally outperforms the Mobile version. This is because its part marketing to make a laptop sound more powerful than it is as well as they are trying to keep the battery life maximized and long battery life and performance together usually dont occur. Its usually long battery life and lesser performance or greater performance and lesser battery life per charge.

Btw if you still have that Core 2 Duo E4300 1.8Ghz.... if you upgrade to the Core 2 Duo E6600 or better than that, you will see quite a difference. But if your happy with the E4300 or the system doesnt support the 6000 series Core 2 Duos you can remain at the 1.8Ghz. I was given a HP Pavilion desktop with the E4300 in it and found it kind of laggy running Windows 7 32-bit Home Premium on 3GB DDR2 667Mhz on a 320GB SATA II HDD. The E6600 upgrade was like night and day in performance comparison. Far better performance.Dave, Appreciate all your input. An SSD is defiantly a great boost i wont deny that. My main machine being a 2007 Macbook 3,1 ran it for the year. sadly i just sent it out to be warrantied as i lost all my first week notes as the drive failed. On a PLUS side, Kingston has a 3 year warranty for the 300V's and i hope to get it back next week.

As for the laptop, i did an AMD upgrade before with an Acer. When i recieved it, it ran a crappy sepron, and now happily runs a Turion with dual core each core 512kb cache and actually boots windows 7 faster then this laptop haha! Ive decided that due to midterms and my brother and i needing a machine, not to tear it apart just yet. But i will ask, what do you mean by TDP?

In the terms of that 4300, yeah thats the one i have. I ran windows 7 Home 64bit on it and once i gave it 4gb of ram the machine flew. I added a Nvidia 210 i think it is and it even plays some basic games. The chip is 64bit so wouldnt running 32bit slow things down? When 10 came out i UPGRADED it and now it runs windows 10 Home 64bit and managed to get another gig of Ram. And its a great little backup desktop. I realize even i should have known comparing portable to stationary isnt fair.

But seriously, when i got the 4300, i had 2gb and it ran horribly, I gave it 3gb a day later, little better. But once i got 4Gb and 64bit it really works great. I have considered an upgrade as i just put together another C2D build that has a 6300 1.8Ghz in it. I was thinking buying the 6400 chip sticking it into the new build and taking that chip and sticking it into the ibm. None the less it will all have to wait till christmas break.
Not LOCATING any CPU upgrade info for you on your model. I'd say if you can get the CPU free and really want to do the upgrade and take a gamble at killing it. You can try this CPU http://www.cpu-world.com/CPUs/K10/AMD-Turion%20II%20Ultra%20Dual-Core%20Mobile%20M640%20-%20TMM640DBO23GQ.html

It was mentioned here for a upgrade of a similar laptop... but no info on whether it was a success or not

http://www.tomshardware.com/answers/id-2118431/replace-athlon-m300-turion-ultra-m660.html

One would hope that the thread didnt go silent with a success or didnt work feedback because they killed their one and only laptop and means to the internet.

I have performed upgrades in the past blindly with desktops with CPUs that are missing from the support list or last of a list all together and generally they either work or dont work, however I did get a old Compaq that was a socket 370 Celeron 500Mhz to upgrade to a Pentium III 800Mhz once that didnt officially support it and I just had to agree to F1 to continue at a Microcode Error since there was no newer BIOS flash to support the better CPU. I was able to run this system normal and healthy on the Pentium III 800Mhz, but at boot you had to press F1 to continue at the Microcode Error. There is always the chance that you will place a CPU in that the VRMs are not heavy enough duty to power such as the CPU this one guy wanted to use was a 35w TDP CPU in place of a 25 watt TDP original CPU. Those 10 watts might be too much for the VRMs.