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-   -   Dell Optiplex 390 Small Form Factor CPU Upgrade (https://www.overclock.net/forum/18077-prebuilt-pcs/1639896-dell-optiplex-390-small-form-factor-cpu-upgrade.html)

Bigceeloc 10-12-2017 12:28 PM

Hi all,
I have a Dell Optiplex 390 with an i3-2120 cpu in it. I was hoping t upgrade it but I'm having trouble finding info on that. Anyone had experience upgrading these?

billbartuska 10-12-2017 01:44 PM

Here's what Dell sold them with:

Bigceeloc 10-12-2017 03:02 PM

I wonder if there is much difference between the i5-2400 and i5-2500......
I would just hope that the BIOS has the codes to recognize it......

frostbite 10-13-2017 08:23 AM

If it wasnt sold with the system it may not work, depending on wether the motherboard was used in another model like a vostro you could get lucky with a bios update or microcode update

I have an optiplex 990 with a 2400 and its ok, deffinatly better than a laptop.
My gx620 usff on the otherhand is stuck to proprietary eveverthing although I swapped out the smithfield for a presler, the only difference was the L2 cache

Bigceeloc 10-13-2017 08:27 AM

Yeah I hear ya. I think I will grab an i5-2400 then. Just to be on the safe side. I can get a bit more life out o these old dogs!

carwarz 01-11-2018 12:23 AM

I have a 390 with a I7 2600, and about to upgrade to a I7 3770

Bigceeloc 01-11-2018 01:25 PM

Will the OptiPlex 390 take it? It sounds like a nice upgrade, but will you really notice that much of a bump in performance? I hope you have a nice SSD and video card in that box before making this upgrade!

alex-fitton 01-12-2018 04:31 AM

I believe the 390 only supports Sandy Bridge processors not ivy bridge. I was looking the BIOS update and couldnt see a line saying the added additional support when i was considering upgrading my 390.

They realised a Dell Optiplex 3010 i think with the Ivy Bridge ones. Looks very similar so no idea if there would be anyway to get a hacked bios for it.

Always worth a try to see if it works for you though.

mweckwerth 05-31-2018 10:45 PM


Originally Posted by carwarz (Post 26543014)
I have a 390 with a I7 2600, and about to upgrade to a I7 3770

Hi Carwarz,

I have a Dell Optiplex 390. I just upgraded from an i3-2100 to and i5-2400. It went well and got the increase in performance I expected.

I can find only a few places on the internet that shows an optiplex 390 with an i7-2600. Did you buy your optiplex with that processor or did you upgrade to the i7-2600?

Have you upgraded to the I7-3770? If so, how did it go?

Thanks for your help.



BigBeeBaby 01-14-2020 08:46 PM

i have an optiplex 390 upgraded upgraded from pentium g640 to i7-2600 (not k) with no problems..
if your gaming i would recommend the i5-2500k its ab $30 on ebay right now.. the i7 is twice that.
If you need hyperthreading for apps like video editing then i recommend the i7-2600k its ab $70 right now..
The reason i recommend the i5-2500k for gaming is because it can be overclocked much higher than the i7 which would benefit games that like fewer faster cores.
i would like to try the upgrade to the i7 3770.. ive seen a lot of people say they were going to try it but no one for sure saying that it worked. But for $80 for the i7 3770 and $110 for the i7 3770k they are really not that much more powerful than the second gen if thats what u already have.

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