Acer Altos R360 F2 Frequently Asked Questions Manual page 28

Altos R360 F2 FAQ (Frequently Asked Questions)
channel B (channel C and channel D). Lockstep Channel mode is the only RAS mode that supports x8 SDDC.
Lockstep Channel Mode requires that channel A and channel B (channel D and channel E) must be populated
identically with regards to size and organization.
Each bit of the ECC code appears in a pair of lockstepped channels. The symbols are arranged so that the data
from every x8 DRAM is mapped to two adjacent symbols, so any failure of the DRAM can be corrected. The
correction capabilities in lockstep mode are:
Correction of any x4 or x8 DRAM device failure
•
Detection of 99.986% of all single bit failures that occur in addition to a x8 DRAM failure. The Integrated
•
Memory Controller will detect a series of failures on a specific DRAM and use this information in addition
to the information provided by the code to achieve 100% detection of these cases.
Detection of all permutations of 2 x4 DRAM failures.
•
24. How do I enable memory lockstep?
ANSWER: Please enter BIOS Setup during POST. ANSWER: ANSWER: ANSWER:
a. Please select Advanced.
b. Please select Memory Configuration.
c. Please select Memory RAS and Performance Configuration
d. You would see below options:
Select Memory RAS Configuration
e. Please change the setting of Select Memory RAS Configuration. You will see the following options
available.
Maximum Performance
•
Mirroring
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Lockstep
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Sparing
•
f. Please select Lockstep
NOTE. The Sparing only available with quad rank DIMM
NOTE. The Mirroring, Sparing or Lockstep option might not be available if the memory population
does not follow the guideline.
g. Please save the setting before exiting from BIOS Setup.
25. Is there any guideline about the memory DIMM population for memory lockstep?
ANSWER: Please refer to Altos R360 F2 Product Spec. ANSWER:
ANSWER: ANSWER:
26. What is "Independent mode"? Does it mean the DIMM A1, B1 C1 and D1 of processor 1 no need to be the
same (capacity, model, etc) in Independent mode?
ANSWER: Independent mode is the general mode without Mirror, lockstep functions enabled. Please populate ANSWER: ANSWER: ANSWER:
the same DIMM at DIMM A1, B1 C1 and D1 of Processor 1.
27. There is always no DIMM populated in memory channel F, F, G & H of Processor 2 when processor 2 is not
installed. Does it mean CPU2 is required to support processor 2 - memory DIMM E1, F1, G1 and H1 of processor
2?
ANSWER: Yes. Processor 2 is required to support memory channel E, F, G & H of processor 2. ANSWER:
ANSWER: ANSWER:
28. Can we mix RDIMM and UDIMM in memory Independent mode
ANSWER: R: R: R: No. ANSWE ANSWE ANSWE
[Maximum Performance]
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