I don't have any hard-disk on the Sil3114 controller and the IDE hard is onboard channel 1.
The sata drivers therfore are on the integrated ATA133 controller not on the SIL3114.

But how i installed Tiger and can't install Leopard?

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MOBO: Aopen n250a-FR nforce3 series
CPU: AMD Sempron 2600+
RAM: 1GB (DDR 400)
GRAPHICS: PNY 6200 256MB (AGP 8x)
LAN: On-board Gigabit Ethernet
AUDIO: On-board Realtek
DRIVES:
WD 120GB (SATA )
Samsung 500GB (SATA II)