@Thetofi​ Even though it uses the same socket, a BIOS microcode update is required to support 3rd-generation processors; the 390 lacks this microcode, so it does not support 3rd-generation chips. It is a choice Dell made when it released the 3rd-generation OptiPlex 3010 model.

The max CPU upgrade is actually an I7-2600k. I personally have an I5-2500 + 16GB of RAM in my Optiplex 390, so don't go with what Dell says is your max upgrade; they want you to buy a new computer, not upgrade your existing one.

Welcome to the Dell Community  @Mewcatchew 

What would you say about the i7-2700K???

They both have the same TDP (95W) and Stepping (D2)???

Although the originals TDP  is (65W) and Stepping is (Q0)!!!

http://www.cpu-upgrade.com/CPUs/Intel/Core_i3/i3-2120.html

Best regards,

U2

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@U2CAMEB4ME wrote:

Welcome to the Dell Community  @Mewcatchew 

What would you say about the i7-2700K???

They both have the same TDP (95W) and Stepping (D2)???

Although the originals TDP  is (65W) and Stepping is (Q0)!!!

http://www.cpu-upgrade.com/CPUs/Intel/Core_i3/i3-2120.html

Best regards,

U2

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The i7-2700k won't work in the 390. The fastest CPU that can be confirmed (from my research anyway) is an i7-2600K.

You're obviously lying, the maximum ram supported is 8GBS of ram.

Welcome to the Dell Community  @Nintendo_Man 

He may be incorrect but I don't think hes lying.

I still think the i7-2700K will work but I do not have one to test so I can't say if it will or won't work.

You do not say "will work" or "won't work" unless you tested it or have first hand knowledge.

As far as the memory it is very possible that 16GB can be installed.

The CPU and Memory Bus can handle it.

If it had 4 memory slots it would be able to handle 32GB.

Best regards,

U2

Can confirm the 16GB capacity, I have several of these machines in service some with 8GB, one with 12GB and another with 16GB. Just make sure that you update to the latest BIOS release (A14) and you are good to go.

The 2700k is a gamble. If Dell had upgraded the latest rev of BIOS to recognize the 2700k in the 390, then you might have a winner. This however, is not user info that they just hand out. You can read through the BIOS release notes of all the versions, and if you see a note that is something like "cpu microcode update", then there might be support for the later versions.

So you can take the gamble if you wish, but I'd say stick with the 2600k if you don't want to possibly fail.

The gains will be miniscule between the 2600k and the 2700k. My guess is that the 2700k is just a revision of the 2600k with some rebadging and HD3000 onboard graphics.

As for RAM capabilities and capacities, this is more CPU dependent than Motherboard dependent, except for the physical slots. The memory controller is on the CPU die and so, in a lot of use cases, the motherboard chipset shouldn't limit the capacity of memory per module. 8GB of DDR3 @ 1333Mhz should be supported just fine in each available slot. 

Timings can be temperamental though, so get some compatible Hynix Unregistered Non-ECC sticks from wherever you prefer.

the socket of these optiplex 390 is lga 1155 and the i7 3770 is compatible with that socket could be put? or what bios supports this processor