You're welcome!!  : ) You're definitely in a different country other than the U.S. if your 780 came with 2 CPU's.  First ever for me.  Some lists, whether it be on the PC or in BIOS, may list each core.  For example, a 4-core CPU may show as 4 CPU's on some lists.  But you probably already verified 2 CPU's by seeing your MB. I'm going to suggest leaving the removable E8400.  That's because as for many Precision's, both CPU's have to be the same.  If you were to try a supported quad, and it didn't work, it won't  break the machine.  You'd just have to put the E8400 back in.  At least you have 4 cores to work with. Good luck to you getting the 780 the way you want it!!  : )
Hello again everyone! So, this time is not an problem or something like that (it's kinda of a problem, but the machine is working, so it's nothing urgent). I need some recommendations on graphics cards for the Optiplex 780 MT. I know, there are some threads talking about this, but my machine is slightly different. When I picked this machine, it wasn't working and everything was apparently fine, so I decided to try and replace the power supplier. Luckily for me, that was the problem. The original power supplier for my model is (if I remember correctly, the 300 W or 305 W??)  but the current power supplier has more than 400 W. In the threads that I saw talking about this they were recommending the GT1030 but for the actual purpose this machine is going to serve, I can't use such old and underpowered device. (I'm going to use this machine for game dev, for example, Unity, Blender and such things. Of course, I'm going to play some games on it too). This said, if anyone could give an opinion on this matter, I would like to know. My machine current specs: - Machine: Dell Optiplex 780 MT; - OS: Windows 10 Pro - Chipset: Intel Q45 Express Chipset w/ICH10DO - Processor: Intel® Core™ 2 Duo E8400/3.0GHz, 6M, 1333FSB  - Memory: 16GB DDR3 1333MHz (4GBx4) - Storage: 250 HDD - Graphics: Integrated on system board      
Sugestions of graphic cards for Dell Optiplex 780