North bridge chipset configuration, South bridge chipset configuration, Split below 4gb [disabled – Asus RS700-E6/RS4 User Manual
Page 66: Channel interleaving [6:1, Rank interleaving [4:1, Scroll down for more items, Configuration options: [disabled] [auto, 18 chapter 5: bios setup

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Chapter 5: BIOS setup
North Bridge Chipset Configuration
BIOS SETUP UTILITY
Advanced
NorthBridge Chipset Configuration
NB Revision
:B2
Current CSI Frequency
:6.400GT
South Bridge Chipset Configuration
v02.61 (C)Copyright 1985-2008, American Megatrends, Inc.
Scroll down for more items.
PCIE Port 1 IOxAPIC Enable [Disabled]
PCIE Port 2 IOxAPIC Enable [Disabled]
PCIE Port 3 IOxAPIC Enable [Disabled]
PCIE Port 4 IOxAPIC Enable [Disabled]
PCIE Port 5 IOxAPIC Enable [Disabled]
←→
Select Screen
↑↓
Select Item
+- Change Option
F1 General Help
F10 Save and Exit
ESC Exit
v02.61 (C)Copyright 1985-2008, American Megatrends, Inc.
BIOS SETUP UTILITY
Advanced
CPU Bridge Chipset Configuration
USB Functions
[12 USB Ports]
USB Port Configure
[8+4 USB Ports]
USB 2.0 Controller
[Enabled]
HDA Controller
[Enabled]
SMBUS Controller
[Enabled]
SLP_S4# Min. Assertion Width [1 to 2 seconds]
PCIE Ports Configuration
PCIE Port 0
[Auto]
PCIE Port 1
[Auto]
PCIE Port 2
[Auto]
PCIE Port 3
[Auto]
PCIE Port 4
[Auto]
PCIE Port 5
[Auto]
PCIE High Priority Port
[Disabled]
PCIE Port 0 IOxAPIC Enable [Disabled]
←→
Select Screen
↑↓
Select Item
+- Change Option
F1 General Help
F10 Save and Exit
ESC Exit
Options
Disabled
2 USB Ports
4 USB Ports
6 USB Ports
8 USB Ports
10 USB Ports
12 USB Ports
Split Below 4GB [Disabled]
Configuration options: [Disabled] [Auto]
Channel Interleaving [6:1]
Configuration options: [1:1] [2:1] [4:1] [6:1]
Rank Interleaving [4:1]
Configuration options: [1:1] [2:1] [4:1]