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If my old desktop PC has a Pentium D CPU in it now, can a be pretty certain a core 2 duo E7500 will work in it?

It used to be same socket (both are socket 775 I'm told) means they're compatible; I'm hoping I can just pop one out and the newer one in and it'll work (although the newer CPU may be limited a bit by the Motherboard's FSB speed).

I don't have a manual for the motherboard so I can't check that or Google it to check compatibility.

Update: As suggested, I used CPU-Z to get the MB model number and looked up the CPU compatibility chart on the manufacturer's website. Problem solved. No luck for upgrading, though - the CPU I already have is the max for this mainboard.

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OK, I'll get CPU-Z and check the manufacturers website. Now... I have 3 great answers (so far), but I'm not sure which one to pick as the most correct and informative answer (for others who came across this question). John T says different power requirements are the problem, but Wil says different chipsets. –  MGOwen Jan 12 '10 at 23:34

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I am not saying no, but I wouldn't bet on it.

The CPU limitation is mainly down to the chipset and not the actual socket it fits in to.

Your best bet is to use a tool such as CPU-Z which should be able to give you your motherboard details, then you can confirm on their website what your board supports.

Also, You may need to do a BIOS update to support it, but the manual/documentation should be able to tell you.

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I wouldn't count on it. I had an older machine with a Pentium 4. I was building a new machine and got a Pentium Dual Core (not even a core 2 duo), and I tried it out in the old machine. It didn't POST.

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I like this one because it's based on actual real-life experience. –  MGOwen Jan 12 '10 at 23:35

No, you can't be certain without the model. First generation Socket 775 Pentium 4,D, and XE motherboards may be incompatible due to different power requirements. Some motherboards may list compatibility with Pentium Dual Core as well as Core 2 Duo, and some may only list Core 2 Duo compatibility or vice-versa. Check with CPU-Z as already mentioned to be sure on your motherboard before making the purchase.

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