Hello! definitely a SIS onboard graphics will not help to play most of the 3D games, by past experience I had with any kind of onboard graphics (except for ATI onboard, I haven't tried those) and I mean SIS, S3, Intel. those graphic cards are basically to turn on the computer, text processing, maybe watch a movie and play 2D games, nothing more, High detailed graphic games won't run (Need for speed MW, BF 2, AOE III, Prey, Doom 3) , and some will run but with a very low performance. If you are really into gaming I suggest to build your own computer, I personally disagree that It will be cheaper (I mean knowing that some dells and Acer are around 400 bucks), but definitely you'll get a much better computer than any OEM, besides you can start with a low butget, just make a good investment on the MOBO and Processor and you can buy a basic RAM and HDD, and later on you can upgrade those components, I have built a decent average gaming machine for around 600 bucks, I mean not the best rig any gamer could dream of but definitely much better than any OEM for gaming. Good Luck