So, I have a Gateway sx2311 computer that has an integrated graphics card (Nvidia GeForce 9200) that I need to upgrade. What I was wondering, is if I buy a bigger case with about a 500 watt power supply on craigslist, will I be able to run a video card like the HIS H667FN1G Radeon HD 6670 1GB 128-bit GDDR5 so long as it fits? BTW my hopes are to run games like league of legends and sc2 with medium to high setting with 40 plus fps, if that's possible.
Gateway uses propriety motherboards in most of their models, which don't fit in standard cases (not all, but most will not). Pretty sure yours is one of these that will not fit a standard case.
The motherboard does have one pice-e x16 slot, so you can fit a a small video card in there. I would recommend a low power card, like a 6670 or a 7750. Now I think the standard cards will squish in, if not look for low profile models.
It would be better to just get a new PSU as most likely the mobo will not mount correctly in the new case. Should be cheaper and less headaches. Also, if possible, buy more fans to increase airflow inside of the current case to better cool the components.