The ideal solution is to install a kit of 4 matching RAM modules. If purchased from Crucial they are returnable if not compatible. You can try 3200 and they may work but will run at 2933. Crucial's site here has 3200 RAM that is marketed as compatible. I mention Crucial because they have the most compatible RAM for Dell systems.
Hi there, I want to upgrade the RAM of my Precision 3440. At the moment it has two 8GB with 2933 MhzIs it possible to combine those extisting two with two 3200Mhz, or do they need to match?   I'm asking, because there aren't any 2933 available..
RAM Upgrade