
In general, as long as your motherboard takes DIMMs, which is nearly all PCs from the 2000s and forward, you don't have to install RAM in identically-sized pairs.If the DIMMs are different speeds from one another, they'll only run as fast as the DIMM with the lower speed. If you want to run your RAM in dual channel or triple channel mode, you will want to buy an identical pair of two of the same size and speed DDR2 or DDR3 DIMMS.To see Crucial's recommendations and pricing, just scroll down. Crucial has been where large companies and individual users alike have purchased RAM for decades, so it's a totally safe place to get what you need. Now that you know your PC's RAM limitations, you can purchase compatible RAM from any tech department store (e.g., Best Buy) or online store (e.g., Crucial, which is the retailer that provided your RAM scanning tool).
