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PCi Slots.

As for the OP, just have a look at your mobo specks online, if your mobo has one x16 and one x8 you will want the 5970 in the x16 slot for best performance. if they are both x16 it doesn't matter :)

Yeah, the top is 16x the one below is 8x if i've read the specifications correctly.

Expansion Slots:

1 x PCI Express x16 slot, running at x16 (PCIEX16) (Note 4)
1 x PCI Express x16 slot, running at x8 (PCIEX8) (Note 4)
(The PCIEX16 and PCIEX8 slots support ATI CrossFireX and ATI Hybrid CrossFireX technologies, and conform to PCI Express 2.0 standard.)
3 x PCI Express x1 slots
2 x PCI slots
 
(Note 4) For optimum performance, if only one PCI Express graphics card is to be installed, be sure to install it in the PCIEX16 slot. The PCIEX8 slot shares bandwidth with the PCIEX16 slot. When PCIEX8 is populated with a PCI Express graphics card, the PCIEX16 slot will operate at up to x8 mode.

So with 2 cards it's x8/x8.
 
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