Hey I am new to this forum. I already have a Transcend DDR3 4GB 1333MHz RAM. I want to upgrade. What RAM should I buy? Considerations - Corsair or GSkill Ripjaws 8GB ( i.e. Total = 12GB) Which is the best model? Budget - 3000 INR Also would I have to remove my Transcend Ram if I got a Gskill or Ripjaws? Thank you!