Both of the cards you listed are OEM-design cards, not reference design cards, and will not be good for hash cracking.
Again, bus width isn't really what you need to be looking at. Do not make your decision based on that.
Since you only have a budget of $300, this is what you should be looking for:
http://www.neweggbusiness.com/product/pr...14-105-033
Again, bus width isn't really what you need to be looking at. Do not make your decision based on that.
Since you only have a budget of $300, this is what you should be looking for:
http://www.neweggbusiness.com/product/pr...14-105-033