Optiplex Desktops

[dmc4708]

After finding several inconclusive threads relating to upgrading the CPU on an Optiplex 3020 to an i7 CPU, I took a chance and purchased an i7-4790 @3.6GHz (with turbo to 4.0GHz) BX80646I74790.

For reference, my Optiplex 3020 MT was running an i5-4570 @3.2GHz (with turbo to 3.6GHz)

Before changing out the CPU, I updated the BIOS to the latest version (version A18 at the time of posting this message).

I retained Dell's bolt-on fan and heatsink, and used Arctic Silver 5 thermal paste.

I'm very happy with the performance increase from what is a relatively inexpensive upgrade.

Here are a few CPU-Z screenshots post upgrade.

[dmc4708]

Hi, can you post screenshots of all the tabs in CPUz.

I assume you updated the BIOS to the latest version before upgrading the CPU?

[JoeyWakes]

All sorted now, if anyone else encounters this problem-

Enable Hyper threads in bios> msconfig> boot> advanced options> number of processor:8 

Thanks for the reply 

[Manas1983]

Hi I tried your method. First enabling HT in bios,then once in windows in msconfing, I only can see 4 in number of processors not 8 like you described. When hyperthreading is enabled in bios, only 2 cores and 4 threads work and CPU is stuck at its stock clock speed and won't boost. When HT is disabled in bios, 4 cores 4 threads show in windows and CPU is boosting normally. Very strange behaviour. I can't get the hyperthreading to work. Can anyone help please?

[PJW626]

Thank you for good infomation.