Fbdimm Open Loop Throughput Throttling - Intel 5000 Series Datasheet

System BIOS
3.4.1

FBDIMM Open Loop Throughput Throttling

Memory throttling is a feature of the Intel 5000 sequence chipsets to prevent FBDIMM memory
from overheating. If the performance of the installed FB-DIMMs approaches their supported
thermal limit for a given platform, system BIOS will initiate memory throttling which manages
memory performance by limiting bandwidth to the DIMMs, therefore capping the power
consumption and preventing the DIMMs from overheating. Memory throttling can be minimized
by operating your platform in "Performance Mode" (default) which changes the system Fan
Control profile to run the system fans at higher speeds. Running the platform in "Acoustics
Mode" will cause the system fans to run slower to meet the acoustic limits for the given platform.
The System BIOS utilizes a Memory Reference Code (MRC) throttling algorithm to maximize
memory bandwidth for a given configuration when memory throttling is initialized. The MRC
code relies on Serial Presence Detect (SPD) data read from the installed DIMMs as well as
system level data as set through BIOS Setup Options and the FRUSDR Utility.
FBDIMM Inputs
(SPD bytes)
Power Property
Heat Spreader
Type
DRAM Type
AMB Thermal
Limit
DRAM Thermal
Limit
54
Intel® 5000 Series Chipsets Server Board Family Datasheet
System Level Inputs
BIOS Setup & FRUSDR
System
Ambient
Trise
+
Fan Flow
Velocity
Altitude
Pitch
Intel order number D38960-004
Memory Throttle
Settings
BIOS MRC
Revision 1.1