I plan to add memory to a 2008 3.2 Ghz 8-core mac pro that comes with standard 2x1GB (2GB) sticks. My original plan is to buy 2x4GB sticks so that I have a total of 10GB. With this I would have to place the memory in two ways: Config 1: Riser A: 4G 4G XX XX Riser B: 1G 1G XX XX Config 2: Riser A: 4G 4G 1G 1G Riser B: XX XX XX XX According to the benchmarks at macsales.com http://eshop.macsales.com/Reviews/Framework.cfm?page=/Benchmarks/macproearly08ram/article.html Memory performance for both config1 & 2 will be bad. So what to do. Should I just buy 4x2G sticks instead of 2x4G sticks to get: Config 3: Riser A: 2G 2G 1G 1G Riser B: 2G 2G XX XX for better performance. My preference is to only buy 4G sticks and have extra free slots for future memory expansion but is concerned with getting poor memory performance in the meantime. Recommendations and comments?