Crossfire Question...Manufacturer?

For a crossfire configuration, does it matter what manufacturer the card is from? I have a visiontek radeon HD4850 512mb now, so do I have to get an exact duplicate (another visiontek) or can I go with a different manufacturer (HIS, MSI, etc...)?
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  1. Plz read the FAQ before posting
    http://www.tomshardware.com/forum/245454-33-crossfire-faqs

    What about brands ?
    Well the brand doesnt matter , again for example , you can use a XFX card with a EVGA card , or a SAPPHIRE card with a DIAMOND card , just make sure they have the same memory and same clocks.

    What will happend if 2 cards have the same amount of memory but one has higher clocks than the other?
    One of the best ways to learn is to make examples.
    You have a 8800GT(Normal edition,no OverClocks) and you want to add another 8800GT(Which is OverClocked),then:

    1_The OverClocked one will lower its clocks to reach the Non-OverClocked card.

    2_You can OverClock your card(The one that has Stock frequencies) and reach the OverClocked card.
    Remember, you cant ALWAYS OverClock the normal card to reach the other card,because it may not OverClock that much and may become unstable.
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