4 GB is more than enough. The only advantages to be gained by 8 GB configurations are found by those who make large numbers of Virtual Machines or use RAM Drive. As these uses are outside of 99% of most peoples computing needs 8 GB is an unnecessary indulgence. In some cases it 8 GB configurations can even slow a machine down and create instability if the motherboard is not of excellent quality. Save some cash and stick to 4 GB.