What is the difference between these two types of memory?

http://www.tigerdirect.com/applications/...
Corsair 2048MB DDR2

and

http://www.tigerdirect.com/applications/...
Corsair Dominator 2048MB PC8500 DDR2

Answer:
Dominator have Corsair’s latest large performance steam sink with Dual-Path Heat Xchange (DHX) technology..
Performance of these modules incorporating DHX can be further enhanced by using the recommended Dominator Airflow Fan, for even more cooling and protection.
Only useful if you work your contraption very tricky with graphics intensive apps or games.
They are almost exchangeable, except the second one, the 'Dominator' has boil sinks. Might be a liitle better if you your environment is warmer or your workstation is in an stall.
the dominator has the grill sinks. keeps it from overheating better
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