It means the slot has 16X physical width but it will only run at 4X electrical bandwidth. This is one of those combo boards that mixes outdated tech with new tech. The chipset is probably older and doesnt fully suport PCIe.
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DFI Lanparty UT nF4 SLI DR
Athlon 64 3500+ Venice
1 Gig OCZ VX DDR500 DDR
BFG GeForce 7800GT
160 Gig SATA HDD
CD-RW DVD-ROM
Antec NeoPower 480
Thermaltake Tsunami
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