Check your manual as another poster has suggested. There you'll find that the ram type is clearly offered. If no manual then visit the mtrbd. makers support website and look for your model#. Get the specs page and there find the ram type, etc.. You want 2gb of ram, understand if you already populated the ram slots with your current ram, you may need to pull those or some in order to get a full 2gb of ram provided your mtrbd. supports that. Say, you have 3 ram slots, currently 1gb of ram using 512mb ram sticks, thus, you need to pull at least 1 or two ram sticks in order to install 2-1gb ram sticks. Some ram maynot work well together so take that into consideration as well, thus get 2-1gb ram sticks at the same time from a trusted vendor.
tada -----Willy 