It's best to install the ram in pairs, so you may want to sell the kingston and get a pair of transcend, which is not the best ram, but may still work fine. I know your choices are limited. My best advice is to ask flipkart about their exchange policy in case the transcend ram won't post with the kingston. If it works by itself, I would sell the kingston and buy one more transcend for a total of 2 gb. Do not be concerned about timings or speed; when mixing ram the motherboard may choose different timings to get the mismatched pair to run. 2-4 gb of any brand will speed up your system. I use 8 gb with windows 7 64 bit. If you're thinking of upgrading anyway, don't buy more ddr2. Get a ddr3 board with ram now.