This information may be helpful to you ,
Optiplex 9020 specifications,
Processor :Intel® Core™ i7 4770 / 3.4GHz(Quad core)
Intel® Core™ i5 4670 / 3.4GHz(Quad core)
Intel® Core™ i5 4570 / 3.2GHz(Quad core)
Memory DR3 1600 MHz Synch DRAM Non-ECC Memory (supports upto 32GB)
Integrated graphics card :Intel HD Graphics 4600 also supports Dual Add-On GPU Card Support.
Hard drive tech supported: SATA 2 ,SATA 3 with Hybrid or/and SED,SATA 3 SSD ,mSATA SSD
Optiplex 3020 Specifications :
Processor supported :Intel® Quad Core i5-4570
Intel® Dual Core i3-4130
Intel® Pentium G3220
Memory DR3 1600MHZ memory(Supports upto 16GB)
Integrated graphics card :Intel HD Graphics
Hard drive tech supported: SATA 3 ,SATA 3 with Hybrid or/and SED ,SATA 3 SSD
If there are any more queries do reply to this community thread ,we will glad to resolve them for you .
Have a great day ahead .
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Manuals and Drivers
I'm trying to figure out the difference too...
(I think the 9020 SFF has a couple more front USB ports, and 4 RAM slots instead of the 2 on the 3020 SFF.)
In the above list, the graphics are a feature of the CPU, so the HD 4600 graphics would also be on a 3020 with an i5-4570 CPU.
The 3020 info doesn't list SATA 2, but of course it would work on it.