If you use onboard Video DDR3 1600 make a little bit different than DDR3 1333..
I just notice when one of my customer try to do some test in window 7...
If it use DDR3 1333 with A8-3870 the Video Score jump from 5.x to 6.x by just change the memory speed from DDR3 1333 to DDR3 1600...
By Window Experience Index Scale this is a big jump... Buy for sure if you use seperate video card then ... no much different..