Pair Dual

Is there an advantage to have a high performance two pairs of identical memory for dual channel memory?
Is there an advantage to have a great performance two identical pairs of memory for dual channel memory? I have a pair of 512MB PC4300 533MHz memory in thew same model that operates in dual channel mode. I am considering upgrade to 2GB. For clarity, I am asking this question in terms of having two pairs of identical memory for dual channel memory against vendors / mix models so they know they must be similar enough to work in dual channel mode. Please let me know if you need any further clarification. Thank you.
There may be a minor performance advantage, but not big enough for you to notice. the latest developments comparison of different brands of RAM showed some variations between brands, but as I rcall the overall performance difference between brands was less than 10% in memory performance. Total System Performance would change by 2-3% at most.
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