Memory Errors; When The System Becomes Unstable - Supermicro X8DTU-LN4F+ User Manual

Memory Errors

When a No_Memory_Beep_Code is issued by the system, check the following:
1. Make sure that the memory modules are compatible and that the DIMM mod-
ules are properly and fully installed. (For memory compatibility, refer to the
Memory Compatibility Chart posted on our website @ http://www.supermicro.
com.)
2. Check if different speeds of DIMMs have been installed. It is strongly recom-
mended to use the same RAM speed for all DIMMs in the system.
3. Make sure you are using the correct type of DDR3 Registered ECC or Unbuf-
fered ECC/Non-ECC 1333 MHz/1066 MHz/800 MHz SDRAM (recommended
by the manufacturer).
4. Check for bad DIMM modules or slots by swapping a single module among
all memory slots and check the results.
5. Make sure that all memory modules are fully seated in their slots. Follow the
instructions given in Section 3-4 in Chapter 3.
6. Please follow the instructions given in the DIMM Population Tables listed on
Page 3-8 to install your memory modules.

When the System Becomes Unstable

A. When the system becomes unstable during or after OS installation, check
the following:
1. OS Compatibility: Check if the OS is compatible with your system
1. CPU/BIOS support: Check if your CPU is supported and if you have the latest
BIOS installed.
2. Memory support: Make sure that the memory modules are supported by test-
ing the modules using memtest86 or a similar utility.
Note: Refer to the product page on our website http:\\www.supermicro.
com for memory compatibility list.
3. HDD support: Check if all hard disk drives (HDDs) work properly. Replace the
bad HDDs with good ones.
4. System cooling: Check system cooling to make sure that all heatsink fans,
and CPU/system fans, etc., work properly. Check Hardware Monitoring set-
Chapter 4: Troubleshooting
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