|What are "all the right specs"?|
When it comes to memory interface, the 3 most generally available are 64-bit, 128-bit & 256-bit. You also need to pay attention to the type of memory used on the card...DDR2, GDDR2, GDDR3, GDDR4, etc. If you're looking for a gaming card, avoid cards with a 64-bit memory interface. Go for either 128-bit or 256-bit. Cheaper low-end cards use DDR2 or GDDR2 memory. For best performance, look for GDDR3 or better.
Use this article as a guide: