An install of Scientific Linux 303 x86_64 worked, and the system is working properly.

The Good
The installer boot kernel properly detects and loads the sata_sil driver.

The Bad
On previous versions of Scientific Linux, the silicon image 3114 chipset was not working in x86_64 mode.

Extra Steps Needed
none

lspci

00:06.0 PCI bridge: Advanced Micro Devices [AMD] AMD-8111 PCI (rev 07)
00:07.0 ISA bridge: Advanced Micro Devices [AMD] AMD-8111 LPC (rev 05)
00:07.1 IDE interface: Advanced Micro Devices [AMD] AMD-8111 IDE (rev 03)
00:07.2 SMBus: Advanced Micro Devices [AMD] AMD-8111 SMBus 2.0 (rev 02)
00:07.3 Bridge: Advanced Micro Devices [AMD] AMD-8111 ACPI (rev 05)
00:0a.0 PCI bridge: Advanced Micro Devices [AMD] AMD-8131 PCI-X Bridge (rev 12)
00:0a.1 PIC: Advanced Micro Devices [AMD] AMD-8131 PCI-X APIC (rev 01)
00:0b.0 PCI bridge: Advanced Micro Devices [AMD] AMD-8131 PCI-X Bridge (rev 12)
00:0b.1 PIC: Advanced Micro Devices [AMD] AMD-8131 PCI-X APIC (rev 01)
00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 NorthBridge
00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 NorthBridge
00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 NorthBridge
00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 NorthBridge
02:09.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5704 Gigabit Ethernet (rev 03)
02:09.1 Ethernet controller: Broadcom Corporation NetXtreme BCM5704 Gigabit Ethernet (rev 03)
03:00.0 USB Controller: Advanced Micro Devices [AMD] AMD-8111 USB (rev 0b)
03:00.1 USB Controller: Advanced Micro Devices [AMD] AMD-8111 USB (rev 0b)
03:05.0 Unknown mass storage controller: Silicon Image, Inc. (formerly CMD Technology Inc) SiI 3114 [SATALink/SATARaid] Serial ATA Controller (rev 02)
03:06.0 VGA compatible controller: ATI Technologies Inc Rage XL (rev 27)
03:08.0 Ethernet controller: Intel Corp. 82557/8/9 [Ethernet Pro 100] (rev 10)

lspci -vv

00:06.0 PCI bridge: Advanced Micro Devices [AMD] AMD-8111 PCI (rev 07) (prog-if 00 [Normal decode])
 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping- SERR+ FastB2B-
 Status: Cap+ 66Mhz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- SERR- Reset- FastB2B-
 Capabilities: [c0] #08 [0086]
 Capabilities: [f0] #08 [8000]

00:07.0 ISA bridge: Advanced Micro Devices [AMD] AMD-8111 LPC (rev 05)
 Subsystem: Advanced Micro Devices [AMD] AMD-8111 LPC
 Control: I/O+ Mem+ BusMaster+ SpecCycle+ MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
 Status: Cap- 66Mhz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- SERR- TAbort- SERR- TAbort- SERR- TAbort- SERR- TAbort- SERR- Reset- FastB2B-
 Capabilities: [a0] PCI-X non-bridge device.
  Command: DPERE+ ERO+ RBC=0 OST=0
  Status: Bus=0 Dev=0 Func=0 64bit- 133MHz- SCD- USC-, DC=simple, DMMRBC=0, DMOST=0, DMCRS=0, RSCEM- Capabilities: [b8] #08 [8000]
 Capabilities: [c0] #08 [004a]

00:0a.1 PIC: Advanced Micro Devices [AMD] AMD-8131 PCI-X APIC (rev 01) (prog-if 10 [IO-APIC])
 Subsystem: Advanced Micro Devices [AMD]: Unknown device 36c0
 Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
 Status: Cap- 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- SERR- TAbort- SERR- Reset- FastB2B-
 Capabilities: [a0] PCI-X non-bridge device.
  Command: DPERE+ ERO+ RBC=0 OST=4
  Status: Bus=0 Dev=0 Func=0 64bit- 133MHz- SCD- USC-, DC=simple, DMMRBC=0, DMOST=0, DMCRS=0, RSCEM- Capabilities: [b8] #08 [8000]

00:0b.1 PIC: Advanced Micro Devices [AMD] AMD-8131 PCI-X APIC (rev 01) (prog-if 10 [IO-APIC])
 Subsystem: Advanced Micro Devices [AMD]: Unknown device 36c0
 Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
 Status: Cap- 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- SERR- TAbort- SERR- TAbort- SERR- TAbort- SERR- TAbort- SERR- TAbort- SERR- TAbort- SERR- TAbort- SERR- TAbort- SERR- TAbort- SERR- TAbort- SERR- TAbort- SERR-