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Thread: Intel 875P Chipset and Memory Features Configuration

  1. #1
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    Join Date
    Feb 2009
    Posts
    11

    Intel 875P Chipset and Memory Features Configuration

    I have a DELL Dimension 8300 computer with a motherboard with an Intel 875P chipset that I am trying to get running.

    The computer has two sets (different vendor sets) of DDR SDRAM RAM, 2x1GHB + 2x1GB, configured in dual channel configuration.

    When querying chipset feature status using the ctiaw software, I was able to determine that the Intel Performance Acceleration Technology (PAT) would be fully-enabled when a 2x1GB memory set is used individually, but not when the sets are used together (status is reported as "reserved").

    Also when the sets are used individually, "Overflowdevice" is disabled, but when the memory sets are used together the feature is enabled.

    What is "Overflowdevice" and what is its significance?

    How can I get PAT to be automatically configured fully-enabled when the two sets of RAM are used?

    The various relevant reports are provided below.

    The CPU- Z 1.64.0.x32 data from the modules:
    Code:
    Memory SPD
    -------------------------------------------------------------------------
    
    DIMM #				1
    	SMBus address		0x50
    	Memory type		DDR
    	Manufacturer (ID)	Mushkin (7F7F7F9400000000)
    	Size			1024 MBytes
    	Max bandwidth		PC3200 (200 MHz)
    	Part number		991429B (996429B
    	Number of banks		2
    	Data width		64 bits
    	Correction		None
    	Registered		no
    	Buffered		no
    	Nominal Voltage		2.50 Volts
    	EPP			no
    	XMP			no
    	AMP			no
    JEDEC timings table		CL-tRCD-tRP-tRAS-tRC @ frequency
    	JEDEC #1		2.0-2-2-6-n.a. @ 133 MHz
    	JEDEC #2		2.5-3-3-7-n.a. @ 166 MHz
    	JEDEC #3		3.0-3-3-8-n.a. @ 200 MHz
    
    DIMM #				2
    	SMBus address		0x51
    	Memory type		DDR
    	Manufacturer (ID)	Hyundai Electronics (AD00000000000000)
    	Size			1024 MBytes
    	Max bandwidth		PC3200 (200 MHz)
    	Part number		HYMD512 646CP8JD43
    	Serial number		FFFF5028
    	Manufacturing date	Week 40/Year 07
    	Number of banks		2
    	Data width		64 bits
    	Correction		None
    	Registered		no
    	Buffered		no
    	Nominal Voltage		2.50 Volts
    	EPP			no
    	XMP			no
    	AMP			no
    JEDEC timings table		CL-tRCD-tRP-tRAS-tRC @ frequency
    	JEDEC #1		2.0-2-2-6-n.a. @ 133 MHz
    	JEDEC #2		2.5-3-3-7-n.a. @ 166 MHz
    	JEDEC #3		3.0-3-3-8-n.a. @ 200 MHz
    
    DIMM #				3
    	SMBus address		0x52
    	Memory type		DDR
    	Manufacturer (ID)	Mushkin (7F7F7F9400000000)
    	Size			1024 MBytes
    	Max bandwidth		PC3200 (200 MHz)
    	Part number		991429B (996429B
    	Number of banks		2
    	Data width		64 bits
    	Correction		None
    	Registered		no
    	Buffered		no
    	Nominal Voltage		2.50 Volts
    	EPP			no
    	XMP			no
    	AMP			no
    JEDEC timings table		CL-tRCD-tRP-tRAS-tRC @ frequency
    	JEDEC #1		2.0-2-2-6-n.a. @ 133 MHz
    	JEDEC #2		2.5-3-3-7-n.a. @ 166 MHz
    	JEDEC #3		3.0-3-3-8-n.a. @ 200 MHz
    
    DIMM #				4
    	SMBus address		0x53
    	Memory type		DDR
    	Manufacturer (ID)	Hyundai Electronics (AD00000000000000)
    	Size			1024 MBytes
    	Max bandwidth		PC3200 (200 MHz)
    	Part number		HYMD512 646CP8JD43
    	Serial number		FFFF5028
    	Manufacturing date	Week 40/Year 07
    	Number of banks		2
    	Data width		64 bits
    	Correction		None
    	Registered		no
    	Buffered		no
    	Nominal Voltage		2.50 Volts
    	EPP			no
    	XMP			no
    	AMP			no
    JEDEC timings table		CL-tRCD-tRP-tRAS-tRC @ frequency
    	JEDEC #1		2.0-2-2-6-n.a. @ 133 MHz
    	JEDEC #2		2.5-3-3-7-n.a. @ 166 MHz
    	JEDEC #3		3.0-3-3-8-n.a. @ 200 MHz
    
    DIMM #				1
    SPD registers	
    		00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 
    	00	80 08 07 0D 0B 02 40 00 04 50 65 00 82 08 00 01 
    	10	0E 04 1C 01 02 20 C0 60 00 75 00 3C 28 3C 28 80 
    	20	60 60 40 40 00 00 00 00 00 00 00 28 28 50 00 00 
    	30	00 00 00 00 00 00 00 00 00 00 00 00 00 00 10 4B 
    	40	7F 7F 7F 94 00 00 00 00 00 39 39 31 34 32 39 42 
    	50	20 28 39 39 36 34 32 39 42 00 00 00 00 00 00 00 
    	60	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    	70	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    	80	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    	90	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    	A0	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    	B0	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    	C0	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    	D0	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    	E0	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    	F0	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    
    DIMM #				2
    SPD registers	
    		00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 
    	00	80 08 07 0D 0B 02 40 00 04 50 70 00 82 08 00 01 
    	10	0E 04 1C 01 02 20 C0 60 70 75 75 3C 28 3C 28 80 
    	20	60 60 40 40 00 00 00 00 00 37 46 28 28 50 00 00 
    	30	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 A8 
    	40	AD 00 00 00 00 00 00 00 01 48 59 4D 44 35 31 32 
    	50	20 36 34 36 43 50 38 4A 44 34 33 41 41 07 28 FF 
    	60	FF 50 28 00 00 00 00 00 00 00 00 00 00 00 00 37 
    	70	4E 37 37 4E 34 37 38 30 32 31 36 00 00 00 00 00 
    	80	49 4E 54 45 4C 43 6F 72 70 6F 72 61 74 69 6F 6E 
    	90	69 39 31 35 50 47 4E 00 00 00 00 00 00 00 00 00 
    	A0	01 01 00 01 01 01 00 00 00 00 00 00 00 03 00 00 
    	B0	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    	C0	00 00 00 00 00 00 00 00 87 00 00 00 00 00 00 00 
    	D0	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    	E0	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    	F0	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    
    DIMM #				3
    SPD registers	
    		00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 
    	00	80 08 07 0D 0B 02 40 00 04 50 65 00 82 08 00 01 
    	10	0E 04 1C 01 02 20 C0 60 00 75 00 3C 28 3C 28 80 
    	20	60 60 40 40 00 00 00 00 00 00 00 28 28 50 00 00 
    	30	00 00 00 00 00 00 00 00 00 00 00 00 00 00 10 4B 
    	40	7F 7F 7F 94 00 00 00 00 00 39 39 31 34 32 39 42 
    	50	20 28 39 39 36 34 32 39 42 00 00 00 00 00 00 00 
    	60	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    	70	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    	80	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    	90	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    	A0	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    	B0	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    	C0	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    	D0	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    	E0	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    	F0	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    
    DIMM #				4
    SPD registers	
    		00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 
    	00	80 08 07 0D 0B 02 40 00 04 50 70 00 82 08 00 01 
    	10	0E 04 1C 01 02 20 C0 60 70 75 75 3C 28 3C 28 80 
    	20	60 60 40 40 00 00 00 00 00 37 46 28 28 50 00 00 
    	30	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 A8 
    	40	AD 00 00 00 00 00 00 00 01 48 59 4D 44 35 31 32 
    	50	20 36 34 36 43 50 38 4A 44 34 33 41 41 07 28 FF 
    	60	FF 50 28 00 00 00 00 00 00 00 00 00 00 00 00 37 
    	70	4E 37 37 4E 34 37 38 30 32 31 36 00 00 00 00 00 
    	80	49 4E 54 45 4C 43 6F 72 70 6F 72 61 74 69 6F 6E 
    	90	69 39 31 35 50 47 4E 00 00 00 00 00 00 00 00 00 
    	A0	01 01 00 01 01 01 00 00 00 00 00 00 00 03 00 00 
    	B0	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    	C0	00 00 00 00 00 00 00 00 87 00 00 00 00 00 00 00 
    	D0	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    	E0	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    	F0	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    Mushkin Set Alone:
    Code:
    ****  INTEL/AMD/VIA memory config info, c't/Andreas Stiller V2.7 June 03 ****
    Kernel Driver: WinNT DIRECTNT.SYS V01.09
    Pentium 4,(0F29-09)ca 3248 MHz (sleep) 2992 MHz (load)
    Bus Speed: max=200MHz, ratio=15 =>  199 MHz
    Hostdevice: (2578) Canterwood i875 MCH, Vendor: (8086) Intel, Rev:0002h
    ----------------------------------------------------------------
    Intel Canterwood i875 MCH Rev:02: Bus:0, Device-Nr:0, Function:0
    System Frequency              : FSB800/200 MHz
    Memory Frequency              : DDR400/200 MHz (1:1)
    IOQ Depth                     : 12 deep
    Top of usable Memory          : 2048.0 MByte
    Extended SMRAM (Tseg)         : disabled
    Overflowdevice                : disabled and unlocked, ID= 257Eh, Rev: 2
    Memory Delays Base Address    : FECF0000 not prefetchable
    CPU Parking                   : enabled
    Memory                        : row0: 1024 MByte/32 KB Pages
                                  : row1: 1024 MByte/32 KB Pages
    DRAM-Channels                 : Dual Channel Linear, DDR
    ECC & Refresh                 : Non-ECC, Refresh=7.8 ?s
    PAT-mode                       : (1)  fully enabled
    Active to Precharge Delay     : 8 clocks .. 70 ?s
    Tcl - Trcd -Trp               : 3-3-3 T (DRAM Clocks)
    
    Memory Read Bandwidth        : ca. 4656.8 MBytes/s, Cacheline size= 128
     >> go on with CR

    Hyundai Electronics set alone:
    Code:
    ****  INTEL/AMD/VIA memory config info, c't/Andreas Stiller V2.7 June 03 ****
    Kernel Driver: WinNT DIRECTNT.SYS V01.09
    Pentium 4,(0F29-09)ca 3270 MHz (sleep) 2992 MHz (load)
    Bus Speed: max=200MHz, ratio=15 =>  199 MHz
    Hostdevice: (2578) Canterwood i875 MCH, Vendor: (8086) Intel, Rev:0002h
    ----------------------------------------------------------------
    Intel Canterwood i875 MCH Rev:02: Bus:0, Device-Nr:0, Function:0
    System Frequency              : FSB800/200 MHz
    Memory Frequency              : DDR400/200 MHz (1:1)
    IOQ Depth                     : 12 deep
    Top of usable Memory          : 2048.0 MByte
    Extended SMRAM (Tseg)         : disabled
    Overflowdevice                : disabled and unlocked, ID= 257Eh, Rev: 2
    Memory Delays Base Address    : FECF0000 not prefetchable
    CPU Parking                   : enabled
    Memory                        : row2: 1024 MByte/32 KB Pages
                                  : row3: 1024 MByte/32 KB Pages
    DRAM-Channels                 : Dual Channel Linear, DDR
    ECC & Refresh                 : Non-ECC, Refresh=7.8 ?s
    PAT-mode                       : (1)  fully enabled
    Active to Precharge Delay     : 8 clocks .. 70 ?s
    Tcl - Trcd -Trp               : 3-3-3 T (DRAM Clocks)
    
    Memory Read Bandwidth        : ca. 4687.7 MBytes/s, Cacheline size= 128
     >> go on with CR

    Mushkin and Hyundai Electronics sets together:
    Code:
    ****  INTEL/AMD/VIA memory config info, c't/Andreas Stiller V2.7 June 03 ****
    Kernel Driver: WinNT DIRECTNT.SYS V01.09
    Pentium 4,(0F29-09)ca 3270 MHz (sleep) 2992 MHz (load)
    Bus Speed: max=200MHz, ratio=15 =>  199 MHz
    Hostdevice: (2578) Canterwood i875 MCH, Vendor: (8086) Intel, Rev:0002h
    ----------------------------------------------------------------
    Intel Canterwood i875 MCH Rev:02: Bus:0, Device-Nr:0, Function:0
    System Frequency              : FSB800/200 MHz
    Memory Frequency              : DDR400/200 MHz (1:1)
    IOQ Depth                     : 12 deep
    Top of usable Memory          : 3328.0 MByte
    Extended SMRAM (Tseg)         : disabled
    Overflowdevice                : enabled and unlocked, ID= 257Eh, Rev: 2
    Memory Delays Base Address    : FECF0000 not prefetchable
    CPU Parking                   : enabled
    Memory                        : row0: 1024 MByte/32 KB Pages
                                  : row1: 1024 MByte/32 KB Pages
                                  : row2: 1024 MByte/32 KB Pages
                                  : row3: 1024 MByte/32 KB Pages
    DRAM-Channels                 : Dual Channel Linear, DDR
    ECC & Refresh                 : Non-ECC, Refresh=7.8 ?s
    PAT-mode                       : (0) reserved
    Active to Precharge Delay     : 8 clocks .. 70 ?s
    Tcl - Trcd -Trp               : 3-3-3 T (DRAM Clocks)
    
    Memory Read Bandwidth        : ca. 4707.9 MBytes/s, Cacheline size= 128
     >> go on with CR
    Last edited by Ascii2; 06-11-2014 at 06:27 PM.

  2. #2
    Registered User
    Join Date
    Feb 2009
    Posts
    11
    Quote Originally Posted by Ascii2 View Post
    What is "Overflowdevice" and what is its significance?
    I am still not sure of the significance of Overflowdevice", but I have noticed that it is disabled by default, but enabled until next reboot if CPU-Z 1.64.0.x32 runs.

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