I;m afraid your out of luck, I have that same computer (but with a celeron) and there are absolutly NO programs that support the PLL. None at all. the bios dosnt support OCing so your best bet is to find a cheap socket p laptop processor with the correct memory frequency on ebay. They can take core 2 duos, and pretty fast ones at that but its not realy worth it because you are still limeted by the cheap intel GMA X3100 GPU. If it were me I'd just leave it as it is, or if you really want to you can get a new CPU. Good luck! :)
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Overclocking a laptop is not a particularly good idea. There'ssimply not enough cooling, aside from the fact that you will void yourwarranty and drain your battery in a flash.If you mean "upgrading" your processor, Achew is right on themoney. It's generally not worth the effort (and will also voidyour warranty).
First, you don't overclock to a new processor. A processor works by running at a frequency mesured in Hertz (named after Heinrich Hertz) and is a measurements of cycles per seconds. A processor works by executing instructions in order and does so by running some number of instructions per cycle. What I'm hinting at here is that to overclock means to increase the frequency at which the processor runs. That's done with software tools or a replacement of the crystal oscillator. Due to that, what you have asked isn't an "overclocking" at all. You're trying to replace a chip with a new one.<br /><br />So, now lets look at the new question. "I want to replace my processor with an intel pentium dual core processor, how do I do that?"<br /><br />Well, we need to figure out what kind of processor you have. Assuming your laptop is the one in this review (http://www.absolutegadget.com/200806101414/reviews /mobile-computing/review-compaq-presario-c700-notebook.html) we can run over to the Intel site (http://ark.intel.com/Product.aspx?id=31727) and check out what sockets it can fit in.<br /><br />The table on there says it has either a PBGA479, PPGA478 socket. That means you have a socket 479 or a socket 478 motherboard. With a quick "wikipedia-ing" we find out that those sockets different enough that they won't take the other's chips (http://en.wikipedia.org/wiki/Socket_479). So, now we need to figure out what kind of socket your computer actually has. Since I don't have physical access to your machine, I can't run any tools to determine this so it is most likely easiest to call the manufacturer and ask them. <br /><br />Now that we know the socket, we can get on google and find a compatible processor. I like Newegg for my purchases so I searched for socket 478 on their site and found this http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&DEPA=0&Order=BESTMATCH&Description=socket+478&x=0&y=0 . You might just be in luck!<br /><br />Now it's a simple matter of scraping a few hundred dollars together, purchasing a chip, ripping your laptop apart, removing the heatsink from your CPU, replacing it, replacing the heatsink (remember to use thermal paste), and reassembling it. Now your laptop will be running in all its dual core multi-threaded glory.<br /><br />If that doesn't sound like something you would like to take part in, then you should probably just go buy a new laptop with the features you like. Or you can bribe one of your nerdy friends with dinner! They will probably even do it with you (which would probably be very interesting for you).<br /><br />Best of luck with your laptop.<br /><br />
Laptop overclocking isn't that great of an idea, since they have fairly crappy cooling and overheat easily. Also, overclocking voids the warranty. With that being said, I've found <a href="http://forums.techpowerup.com/showthread.php?t=25716">this thread</a> to be a very good guide for laptop overclocking. Just be sure to keep an eye on your temperatures and you'll be fine.<br />