Please keep in mind that the Intel Pentium® Processor E6600 is not the same one as the Intel® Core™ 2 Duo processor E6600.
Those two processors are from different families, so even when they are from same socket (LGA775 and PLGA775), they are not compatible with the same motherboards. So you need to check with the motherboard manufacturer for a list of fully compatible processors, if the Intel® Core™ 2 Duo processor E6600 is compatible with your motherboard, then I would suggest contacting the place of purchase so they can exchange the Intel Pentium® processor E6600 with the Intel® Core™ 2 Duo processor E6600 so it will work just fine.
Thank you Adolfo for your Answer, but this morning I've upgraded my motherboard's microcode to version 1.06 rev. A with the SOFTPAQ NUMBER: SP51243 from HP. And now I can use this new E6600 CPU.
One of the enhancements offered by this update is the ability to support processors with different IDs
[...]ENHANCEMENTS:- Updates the Intel Processor microcode for processors having CPU IDs 6F6, 6F2, 6FD, 10676, and 1067A.[...]The CPU that I have bought as a CPU ID of 1067A, yé !
Now another question comes into my mind and maybe can you provide my the answer to it.
I can understand why they don't have the same CPU frequency (one was released in 2006 and they other in 2010)
But why, one is labeled as a Intel Pentium and the other as an Intel Core 2 Duo.... They both have 2 cores ....
Aren't they supposed to be identical ? They both have the same processor number (E6600) ...
They support the same technologies...
The only differences I can see is the CPU frequency and Cache Size AND now socket type ...