it could, but nothing that you would really notice to the level of a SSD, more ram might help. Don't forget that cpu chips tend to get tuned to certain speeds of ram, i BELIEVE you would see a more noticable increase from the new AMD APU's going 1866+ on speed vs 1333, i typically haven't been bothering above 1600 on the i5s i've been putting together, would wait and see what others have for hard facts/experience.
System RAM is about 100 times faster than the typical hard drive, so obviously the hard drive has a very disproportionate impact on loading games. The disk storage is the bottleneck for loading games, not RAM. As long as RAM is faster than the hard drive, speeding up memory will have no impact on game load times. The system will always be waiting for data from the hard drive.