Yes it will. I usually have a dozen Google gadgets going, a web cam surveillance feed
and a web browser with multiple tabs as my base. Then add hulu video streams or Bluray playback, documents and photo editing programs (Picasa, Lightroom, Quicktime Pro - soon!!!) open. This was handled by an athlon II x 4 620 system but would get sluggish with any additional tasks. Really all I had to do was close a few things down and it was fine...RAM wasn't an issue as it was monitored and well under max load. My CPU in that case was my bottle neck. moving to a core i7 860 opened up that top end - again the 60mph -125+ example. Thats were hyperthreading comes in. In a nut shell the 860 behaves as if it had 8 cores which is great for video editing, system intensive tasks, and benchmarking. Honestly though, real world, the Phenom II is plenty. I'm just picky and scatter brained...plus I like to fill my work space (currently 2 monitors...waiting for nVidia for "surround") with busy little beavers
For me the 860 shines but I do rely on this PC for work as well so I need to be able to switch gears in a hurry if called upon. Try googling some comparisons between the Phenom II x4 and core i5/7. But remember Intel performs better with synthetics. I've been most pleased with my AMD builds.