Hello, i am happy to to confirm that the BSEL mod worked on my Dell Vostro 1500 and installed a new Intel Core 2 Duo T9400 on it.

That is right, having the latest BIOS (A06) the computer recognized the new Penryn CPU and booted right away, which means that the Vostro 1500 is compatible with the first and second Penryn CPUs (around the time the Montevina chipset was released).

So, to all the Vostro 1500 users out there, you will be able to upgrade the CPU, making your laptop faster, cooler, or both.

Thanks to all the guys that made this possible by sharing their work with the rest of us.