SUPER MICRO Computer X8DTU-6F+-LR manual Possible System Memory Allocation & Availability, Tseg

X8DTU-6F+/X8DTU-6TF+/X8DTU-6(T)F+-LR User's Manual

1.35V RDIMM Population for the Motherboard w/5600 Processors

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2	Reg. DDR3 ECC	800,1066 (Note 2)	Mixing SR, DR
2	Reg. DDR3 ECC	800 (Note 3)	Mixing SR, DR, QR
3	Not Available	Not Available	Not Available

Note 1: 1333/1066 MHz QR RDIMMs will run at 800 MHz (-BIOS automatic downgrading).

Note 2: 1333 MHz SR/DR RDIMMs will run at 800 MHz (-BIOS automatic downgrading).

Note 3: 1333/1066 MHz SR/DR/QR RDIMMs will run at 800 MHz (-BIOS automatic downgrading).

Note 4: MIxing of 1.35V and 1.5V DIMMs is not recommended.

1.35V UDIMM Population for the Motherboard w/5600 Processors Installed

DIMM	DIMMs	UDIMM (Unb. DIMM/	Speeds (in MHz)	Ranks per DIMM
Slots per	Populated	Unbuffered DIMM)		(any combination;
Channel	per Channel			SR=Single Rank,
				DR=Dual Rank,
				QR=Quad Rank)
3	1	Unb. DDR3 ECC	800,1066,1333	SR or DR
3	2	Unb. DDR3 ECC	800,1066	Mixing SR, DR
3	3	Not Available	Not Available	Not Available

Note 1: 1333 MHz for two DIMMs per channel is supported when Unbuf./ECC DIMMs are used.

Note 2: MIxing of 1.35V and 1.5V DIMMs is not recommended.

Note 1: Due to OS limitations, some operating systems may not show more than 4 GB of memory.

Note 2: Due to memory allocation to system devices, the amount of memory that remains available for operational use will be reduced when 4 GB of RAM is used. The reduction in memory availability is dispropor- tional. (See the following Table.)

Possible System Memory Allocation & Availability

System Device

Firmware Hub flash memory (System BIOS) Local APIC

Area Reserved for the chipset

I/O APIC (4 Kbytes)

PCI Enumeration Area 1

PCI Express (256 MB)

PCI Enumeration Area 2 (if needed) -Aligned on 256-MB boundary-

VGA Memory

TSEG

Memory available for the OS & other applications

Size

1MB

4KB

2MB

4KB

256MB

256MB

512MB

16MB

1MB

PhysicalMemory

Remaining (-Available)

(4 GB Total System Memory)

3.99GB

3.99GB

3.99GB

3.99GB

3.76GB

3.51GB

3.01GB

2.85GB

2.84GB

2.84GB

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