Technically top fans provide better ventilation do to the chimney effect (hot air rises) but I like a case you can put junk on top of.
Your modern parts are not going to generate all that much heat so I wouldn't worry too much about it one way or another.
The 660 is going to pull at most 140 watts and the CPU's TDP is an 80 watt part. That is significant enough to require decent ventilation but not enough to need an extreme cooling solution. I've got a similar setup with front and back fans, none on top and it is fine.
When I was running a 6 core chip with 3x video cards I used a case that had a huge top fan and it still caught on fire!
Your modern parts are not going to generate all that much heat so I wouldn't worry too much about it one way or another.
The 660 is going to pull at most 140 watts and the CPU's TDP is an 80 watt part. That is significant enough to require decent ventilation but not enough to need an extreme cooling solution. I've got a similar setup with front and back fans, none on top and it is fine.
When I was running a 6 core chip with 3x video cards I used a case that had a huge top fan and it still caught on fire!
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