Chosen Solution
If you’re concerned about compatibility, the best way to correct it is replace the existing modules with a factory matched pair from a reputable vendor that meets what you needs. It’s not worth the effort to try and match up a module you’ll probably never find again since it probably came from a Chinese factory who sold them to the highest bidder willing to print a name on it. Since we don’t know what laptop you have, we can’t help you find a matching set to replace it. It looks like DDR2 (possibly DDR3; hard to tell from your photos) to me based on the place the notch is but I’m not entirely sure without a machine model. This is also the easiest way to repair a RAM incompatibility as well, since it’s often hard to know why the mixed pair isn’t playing along well and it’s typically a pain to find a compatible enough match. Keep the non matched modules but don’t reinstall them unless you find a exact match or a compatible module to pair it with.
Is this the product you are looking for? https://www.ebay.com/itm/4-All-RAM-Modul…
