[desiibond]

First and foremost, you need to buy another RAM module with same timings as the Transcend one that you have and if you pair Transcend with OCZ or Corsair, Transcend will be a bottleneck. So, either get 2Gb Transcend or get a pair of 2gig corsair or ocz ram modules. You can then use 4gig corsair/ocz in dual channel pair and put transcend in the other channel or sell if off (only 64bit OS can recognize 4gig or more ram. 32-bit cannot access memory outside 3.5Gb)