Have you even looked at the inside of your Dell?
You have Dual mPGA604 (604-pin) sockets unless one is not in use and you only want to upgrade one?
What does CPU-Z say?
Yes, I know it had dual mPGA604 sockets, but that in and of itself doesn't help figure out what processor I actually have. Lots of different processors use that socket.
I know the specs. I posted them in the original post, but I don't know what the model code or part number for the processor is, so I can go order another one (or a faster one) until I do.
Like I said in my original post, I'm having trouble using Intel's product documentation because their documentation is inconsistent with what is actually installed (Intel 64 vs. EM64T, HT vs HT not being supported, etc). I don't know if I'm looking at older documentation or what, but all I know is that I have no idea how go to my online distributers and order another one.
EM64T is Intel 64
You don't have HT you have 2 CPUs with one core each.
Going by this:
Up to two single-core 64-bit Intel® Xeon™ processors at up to 3.8GHz
or up to two dual-core 64-bit Intel Xeon processors at 2.8GHz
Thanks for the clarification on Intel64 vs EM64T.
I don't have 2 physical CPUs installed in the system, I have only one. I cracked open the case yesterday in order to determine the socket type and paid special attention to the well engineered plastic insert they put into the empty CPU socket.
So now you see my confusion. It can't be dual core because it's 3.0Ghz. Intel's documentation says the closest CPU match to mine, based on specs does not support HT, but my system shows two CPUs...