Dual-Core / Quad core HELP

Greetings, looking for clarification on Dual-Core / Quad core
so is Dual-Core actualy Two CPU stacked in one socket?
is this equal in speed to an Dual Processor?

This Makes sense to me: Dual AMD Athlon Processors

This i'm not sure about:
Processor Type AMD Athlon 64 X2 Dual-Core 3800+ processor 2.0GHz
Processor Manufacturer AMD
Processor Installed Qty 1
Processor Max Supported Qty 1
Processor Number 3800+ "

so this states 1 processor installed, so what makes it Dual Core?

Basicaly what i'm looking for are TWO 64bit processors on one main board. (for 3D animations)

thanks for any help clearing tis matter up!

thanks Grimmy,
Mostly i'm just reading stats (at DELL, or HP) the machines are already built, so no box colors to look at. Thanks for pointing out the X2 as being two processors stacked. I guess thats what im looking for. i want Two actual processors, NOT 1 CPU with Hyper threading.

Dual core is essentially having tow CPUs in one package. You only need one slot for a dual core CPU vs. two sockets for dual processors. These days it is actually possible to have dual processors that are dual cores - 4 cores total - but this is very expensive.

Sounds to me like you want either an Athlon64 X2, a Pentium D, or a Core 2 Duo. The Pentium D is relatively old technology and uses a relatively high amount of electricity but would be on the inexpensive side if they are still available from Dell and HP. The Core 2 Duo is generally a higher performance design than the Athlon64 X2 but the prices will also be higher for the Core 2.