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Question posted by Sccn64 on April 7th, 2010

Channel B Memory Not Working

I currently have two 4GB sticks of memory in slots A1 and A2 (8GB total). I bought another 4GB stick that I was hoping to put in channel B1 to get the benefits of dual channel. However, the system never seems to recognize anything I put in slots B1 or B2. At first, I thought this might be because the sticks were not sold as a pair and, therefore, would not work together as dual channel. To test this, I tried moving the two working sticks in A1 and A2 to B1 and B2. After doing this, the system did not recognize them either. So, it appears that there's a problem with channel B itself, not the actual memory.Is there anything I'm missing such as a BIOS setting to "turn on" channel B, or am I most likely stuck with a slightly defective motherboard?

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Request from exotericroach on November 14th, 2010 4:37 PM
This sounds like a voltage problem, have you attempted to put 1 stick of 4gb into the first b channel slot and and leave the rest of the slots alone, if this works, move forward with another stick in an a channel, switch out modules until you get a boot, if you do not get a clean boot, then the problem is one of two things:

1.) Voltage settings, Cas Latency Settings, Are incorrect in the bios, consult asus documentation on the website to find out what modules and what voltages/cas settings are supported, most of the time, asus will even have a recommended memory for a certain motherboard.

2.)The combination of your memory is not compatible with the board, or The bios needs to be flashed and updated, check out asus website to download updates for the bios, this can solve a lot of problems down the road as well..

i have built quite a few asus based systems, and i have run into the exact same problem, eventually after trying everything including motherboard exchange and bios updates, it ended up being the memory was not compatible with the board, even though the asus website claimed compatibility with the corsair modules i was using.. i wish you the best of luck!

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Answer #1: Posted by exotericroach on November 14th, 2010 4:38 PM

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This sounds like a voltage problem, have you attempted to put 1 stick of 4gb into the first b channel slot and and leave the rest of the slots alone, if this works, move forward with another stick in an a channel, switch out modules until you get a boot, if you do not get a clean boot, then the problem is one of two things:

Shaun Michael Hawkins, A+ Certified, MCSE, Http://www.xtechnica.net

Related Asus SABERTOOTH 55i Manual Pages

User Manual - Page 1

Motherboard SABERTOOTH 55i

User Manual - Page 3

...vii Safety information...viii About this guide...ix SABERTOOTH 55i specifications summary xi Chapter 1: Product introduction ... 2.1 Before you proceed 2-1 2.2 Motherboard overview 2-2 2.2.1 Motherboard layout 2-2 2.2.2 Layout contents 2-3 ...memory 2-10 2.4.1 Overview 2-10 2.4.2 Memory configurations 2-11 2.4.3 Installing a DIMM 2-17 2.4.4 Removing a DIMM 2-17 2.5 Expansion slots...

User Manual - Page 11

SABERTOOTH 55i specifications summary CPU Chipset Memory Expansion slots Multi-GPU support Storage LAN USB IEEE 1394 Audio LGA1156 socket ...DIMM, max. 16GB, DDR3 2000 / 1800 / 1600 / 1333 / 1066 MHz, non-ECC, un-buffered memory Dual channel memory architecture Supports Intel® Extreme Memory Profile (XMP) * Hyper DIMM support is available only when the hard disk drives are set as data drives...

User Manual - Page 12

... Q-Slot ASUS...channel Audio I /O connectors "TUF ENGINE!" button 1 x Power on switch 1 x Reset switch (continued on the next page) xii CoolMem! Fan Frame - Power Design - 12-phase CPU Power - 2-phase Memory Power - 2-phase VTT_CPU Power - CeraM!X Heatsink Coating Technology - SABERTOOTH 55i...ATX Power connector 8-pin EATX 12V Power connector System Panel (Q-Connector) 1 x MemOK!

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... another standout in -1 ASUS Q-Connector kit 1 x ASUS Q-Shield 1 x CoolMem! Actual product specifications may vary with the list below. 1.2 Package contents Check your motherboard package for the following items. Chapter 1 ASUS SABERTOOTH 55i motherboard 1 x Ultra DMA 133/100/66 cable 1 x 2-port USB 2.0 and 1-port eSATA module 6 x Serial ATA 3.0 Gb/s cables 1 x 2-in the long line of...

User Manual - Page 16

...Substances (RoHS). SABERTOOTH 55i brings you 've never experienced before! Green ASUS This motherboard and its packaging...motherboard supports the latest Intel® Lynnfield processors in multiple GPU configurations. PCIe 2.0 This motherboard supports the latest PCIe 2.0 devices for details. Dual-Channel DDR3 2000 / 1800 / 1600 / 1333 / 1066 support The motherboard supports DDR3 memory...

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...than the industry's standard. 1.3.5 ASUS exclusive features ASUS Crystal Sound This feature can damage the motherboard's components. Chapter 1 1.3.4 "Safe & Stable!" MemOK! In addition to determine failsafe settings ...through the most common PC audio setups-your system booting success. Memory compatibility is the fastest memory booting solution today. Refer to page 2-24 for anyone who ...

User Manual - Page 21

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User Manual - Page 30

... configurations One DIMM: Install one memory module in slot A1 or B1 first as a DDR2 DIMM but is notched differently to prevent installation on a DDR2 DIMM socket. DDR3 modules are developed for better performance with four Double Data Rate 3 (DDR3) Dual Inline Memory Modules (DIMM) sockets. Two DIMMs (dual-channel operation): Four DIMMs (dual-channel operation): 2-10 Chapter 2: Hardware...

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... limitation on 32-bit Windows OS, when you install 4GB or more on the motherboard. ASUS SABERTOOTH 55i 2-11 To use DIMMs of up of 512Mb (64MB) chips or less (Memory chip capacity counts in Megabit, 8 Megabit/Mb = 1 Megabyte/MB). • The default memory operation frequency is recommended to protect the CPU. • According to support...

User Manual - Page 36

... the beige slots as one DIMM per channel only. To use DIMMs of a higher frequency with a core frequency of 2.66G support the maximum DIMM frequency of Dual-channel memory configuration. • ASUS exclusively provides hyper DIMM support function. • Hyper DIMM support is supported for the latest QVL. 2-16 Chapter 2: Hardware information SABERTOOTH 55i Motherboard Qualified Vendors...

User Manual - Page 39

... 7 Reserved 13 8 Numeric Data Processor 14 9 Primary IDE Channel * These IRQs are usually available for this motherboard A B C D E F G H PCIE x16_1 shared - - - - - - - PCIE x1_3 - shared - - - - shared USB 2.0 controller 2 shared - - - - - - - 1394 controller - - shared - ASUS SABERTOOTH 55i 2-19 IRQ assignments for PCI devices. LAN1 (8112...

User Manual - Page 43

... 2 ASUS SABERTOOTH 55i 2-23 This switch also lights up the system. 2.7 Onboard switches Onboard switches allow you should shut down the system and unplug the power cable before removing or plugging in any motherboard component. Power-on switch The motherboard comes with a power-on switch that you to fine-tune performance when working on switch...

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User Manual - Page 91

This feature requires an ATX power supply that provides at least 1A on ...motherboard temperatures. CPU Fan Speed [xxxxRPM] or [Ignored] / [N/A] Chassis Fan 1/2 Speed [xxxxRPM] or [Ignored] / [N/A] Power Fan Speed [xxxxRPM] or [Ignored] / [N/A] The onboard hardware monitor automatically detects and displays the CPU, chassis, and power fan speed in rotations per minute (RPM). ASUS SABERTOOTH 55i...

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User Manual - Page 117

...-ready graphics cards or one CrossFireX-ready dual-GPU graphics card that are ATI® certified. • Ensure that your graphics card driver supports the ATI CrossFireX technology. To uninstall existing graphics card drivers: 1. For Windows XP, select Add/Remove. ASUS SABERTOOTH 55i 5-1 Turn off your current graphics card driver/s. 4. Close all existing graphics...