generally you always color match. So each pair of ram goes in the slots with the same color. (assuming your ram slots are 2 different colors)
Though it doesn't hurt to check the manual for your mobo, in case it says which pair of slots to use for the smaller ram in the event of 2x2 unmatched pairs (like in your case).
unganged mode is better.
Quote:
Ganged vs Unganged
Dual-channel was originally conceived as a way to maximize memory throughput by combining two 64-bit buses into a single 128-bit bus. This is retrospectively called the "ganged" mode. However, due to lackluster performance gains in consumer applications as discussed above, more modern implementations of dual-channel use the "unganged" mode by default, which maintains two 64-bit memory buses but allows independent access to each channel, in support of multithreading with multi-core processors.
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