Your PC has 2 Slots and can be upgraded to 16GB (2x8GB). INSIDE YOUR DELL OPTIPLEX 3020 - (MICRO PC). Kit Capacity: 16GB.
eBay
076-1437 076-1422 A1418 A1419 Upgrade memory RAM Replacement HDD SSD Display Tape/Adhesive Strip/open LCD tool for iMac 27"21.5"
Aliexpress UK
We only supply branded memory such as Kingston, Hynix, Samsung, Micron, Crucial, Elpida, Integral etc. Please read the item specifics for more information on this product, if the title lists this as a kit, it will consist of the number of modules in the item specifics.4GB DDR3 240-Pin Memory RAM Upgrade for Dell Optiplex 390 790 990 Computer PC.
eBay
CHUWI MiniBook X Laptop Tablet 2 In 1 Intel N150/N100 10.51" FHD IPS Screen 16GB / 12GB RAM LPDDR5 512G SSD Windows 11 Notebook
Aliexpress UK
Item Description: 1GB Memory Upgrade for MB800V-R Industrial Motherboard DDR1 PC3200U / 400MHz RAM Module The memory we supply is only branded memory such as Kingston, Hynix, Elixir, HyperRAM, Samsung, Micron, Crucial, Elpida, Integral etc. Fully Load Tested Well packaged in anti-static Fast Dispatch - Please choose preferred option when checking out.
eBay
32GB 16GB 8GB Memoria RAM DDR4 3200MHz 2666 2400 2133 MHz Laptop Memory 260Pin SODIMM PC4-19200 21300 17000 DDR4 Notebook Memory
Aliexpress UK
Compatible with Mid 2010 and Mid 2009 MacBook Pros. Storage Capacity. FULLY TESTED (AT LEAST 50 HOURS). I will be happy to answer them, if I can.
eBay
Factory Wholesale Sodimm DDR3 4GB 8GB 2GB 1333 1600MHZ for Laptop Memoria Ram
Aliexpress UK
Type: DDR4 SODIMM (laptop / small form factor). Capacity: 16GB stick.
eBay
CORSAIR Vengeance LPX DDR3 Kit 8GB 2400MHz 2133MHz 1866MHz 1600MHz 1333MHz Desktop Memory 240Pin DIMM 1.5V DDR3 RAM
Aliexpress UK
The only way to check this is by manually looking at your modules. However with a four slot machine like yours this is not an issue as you need to remove all of the existing ram to upgrade, but its worth knowing about.
eBay
Beelink Mini S13 Intel Twin Lake N150 S12 Pro N100 16G 500G Windows 11 Mini S 11th N5095 DDR4 8GB 128GB Desktop Computer N95
Aliexpress UK
Picture For Reference Purpose Only. Item Discription : .
eBay
JEYI Memory RAM Heatsink With Thermal Pads, Desktop RAM Cooler DDR Radiation Dissipate for PC DIY DDR2 DDR3 DDR4 DDR5
Aliexpress UK
Total accessible RAM: 1024KB (64KB base RAM + 960KB RAM expansion). Allows to run CP/M Plus and FutureOS -both will see 1024KB available. Fits inside a CPC 464/664.
eBay
Direct heating 90*90 K4Z80325BC-HC14 K4Z80325BC-HC16 K4ZAF325BM-HC14 K4ZAF325BM-HC16 GDDR6 DDR6 FBGA180 stencil
Aliexpress UK