CPU Socket Question.

Hello!

I am in the middle of building a PC. The PC has an AMD Phenom II

I was under the impression that all Phenom II processors where AM3.

Anyway, I did some research and came to the conclusion that my Phenom II 820 was an AM3 CPU

Here is the website I found my information( I also used other websites to verify)

AMD Phenom II X4 820 Deneb 2.8GHz Socket AM3 95W Quad-Core Processor HDX820WFK4FGI - Newegg.com

The Website says it is an AM3 CPU..

So i did some more research and i found out that i can place a AM3 CPU into an AM3+ Socket. I ordered an AM3+ Motherboard so i can upgraded my CPU later.(when i have cash of the flows)

My Motherboard arrived a week later(today) and i started taking out my CPU. After removing the CPU i seen the socket was an AM2:confused:

So then i took to the internet and found this website

AMD Phenom II X4 820 - HDX820WFK4FGI

Now i am confused. Is this CPU an AM3 or AM2. Can i still place it in my AM3+ Motherboard?

Thanks. Here is the Motherboard

M5A78L-M LX PLUS - Motherboards - ASUS


This is what I found, but I would LOVE a second opinion
ASUSTeK Computer Inc. -Support- CPU Support M5A97 R2.0&p=1&s=24