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I have a samsung R510 with a core 2 duo T6400. http://ark.intel.com/products/40479/

I took it apart earlier today to clean it up inside, since it has been overheating recently. When I got the heatsink/fan combo off I noticed that the cpu can easily be removed and replaced, it's not soldered onto the mobo. So then I did little googling about upgrading it, as the laptop is a few years old now and feels sluggish by modern standards.

How can I find out what cpu's are compatible? From what I've gathered so far (I'm probably completely wrong) it should obviously be from the c2d family, the fsb should be the same (800mhz) and the voltage also?

So it seems like the best I can upgrade it to is a T9500? Or do I have other options?

--edit--

Motherboard: samsung ba92 04810b (gm45/gm47)

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closed as off topic by Sathya Mar 11 '13 at 3:25

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You are headed in the right direction and this is a well written question. The motherboard will determine what processor you can use. Find the motherboard part number and research that. You will find a list of compatible processors. –  CharlieRB Oct 5 '12 at 11:43
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Use a utility like CPU-Z to check what chipset you have. If it's GM45 or PM45, then you should be able to use all Montevina-era Penryns (1066 MHz FSB), meaning up to T9900 and P9700. Best bang for buck would probably be T9600 or P8800. If it's GM965 or PM965, then you're limited to Santa Rosa-era Penryns and Meroms (800 MHz FSB), meaning up to T9500. Best bang for buck would probably be T9300. –  Indrek Oct 5 '12 at 11:55
    
You are likely going to spend more money trying to purchase a replacement CPU then the laptop is actually worth. You are better off buying an entire used laptop. There is not a market for laptop upgrades outside of your typical storage devices and memory upgrades. –  Ramhound Oct 5 '12 at 14:14
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@Ramhound - The Op is seaching for compatible options, not advice on cost savings. :) –  Carl B Oct 5 '12 at 19:52
    
Thanks for the help guys :) really appreciate it! I am actually living in China at the moment, and after a quick search on taobao (chinese ebay) I see that I can pick up a T9300 for about 50usd, so that's not too bad for 25% more processing power. I looked at the faster cpu's available as well like the T9500 but for an extra 100mhz it's not really worth the price to me. –  mrjetlee Oct 5 '12 at 20:10