Problem Description: I have windows 7 home premium 64 bit. I had 2 Gbytes of DDR2 ram and had no problem. I tried to add extra 2 GB of ram to a total of 4 Gb. I saw using CPU-z and on my_computer,the system was identified 4 Gb of ram as expected, with dual channel. The problem is that my Internet works very slow !!! I tries with IE and chrome ,and the internet speed was very poor. I removed the extra ram , and the internet speed was high again. I repeat it 3 times an the results was the same : 2 GB ram - fast Internet. 4 GB ram - slow Internet. The CPU utilization was only about 5-10 %,and about 25 % of ram was in use. I didn't try to check the performance with other programs. I also run the windows memory diagnostic tool, and it complited successfuly with no errors.
I don't know if its relevant. I have dual boot, with XP 32 bit as the other operating system. (with the XP there is no problem - fast internet)