What motherboard does the Dell Optiplex 390 have? I know it bears a core 2 duo at 2.13Ghz. That's it

Basically what the title says. What motherboard does the dell optiplex 390 have? I need to find out the machine's possible upgrades for graphics, ram, processor and DVD drive. Can't find anything on the motherboard. Thanks to anyone in advance.
 
It's a Dell branded motherboard.

Processor Support:
Intel® Core™ i3 2100
Intel® Core™ i3 2120
Intel® Core™ i5 2400

Memory Support:
Up to 8GB DDR3 1333mhz

DVD drive:
Doesn't matter
 
But the Core 2 Duo at 2.13GHz which seems to be the e4600 series is a 775. Can you clear this up for me? It's not the mini tower. it's full size as far as I'm aware.

It's a college assignment and the machine we were given to upgrade was the optiplex with a 2.13GHz C2D. That's the thing. It does exist, I've found it. This sucks!
 
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It's a college assignment and the machine we were given to upgrade was the optiplex with a 2.13GHz C2D. That's the thing. It does exist, I've found it. This sucks!
Well it's not the 390. The optiplex 745's and up to the 780's had C2D's.
 
I don't know what to say.
We were given these specs and told to upgrade what we could. We were also told it was the Optiplex 390. Can you shed light on what's going on here.
This is the only PC I'm having problem finding specs for.

Optiplex 390
Processor: Core 2 duo 2.13GHz
Memory: 4GB DDR2
Graphics: On-board VGA
HDD: 160GB SATA
DVD ROM
1 PCI, 1 PCI 8, 1 PCI 16
375w ATX
Ethernet: 1 onboard RJ45
4 SATA Slots
 
Dell has manuals for all their machines on their support site. Poke around there and I'm sure you'll find something to help you ;)
 
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