Dual x16 or dual x8,x8

ok im building a new computer and im looking at motherboards. i see some that have pci express 2.0x16 slots that run dual @ x16 and then there are some that run dual @ x8/8 whats the difference?
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  1. About 2-3% decrease going from dual X16 to dual X8. marginal at worst.
  2. It's all about Data transmission;
    http://en.wikipedia.org/wiki/PCI_Express
    on the other hand ..you can compare it to a 16 lane wide highway. if there are just 8 cars on the road, it doesn't matter if they have 8 or 16 lanes available. they simply wont need the additional 8 lanes,if you plan on CF/SLI +new platform i would recommend GA-P67A-UD7 (2 x PCI Express x16 slots, running at x16 (PCIEX16_1, PCIEX16_2)
  3. thanks both of you. ortoklaz thats a nice board but im building an amd system and i got a good mobo picked out already for dual at X16
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