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Need help with SDRAM timings in my Intel D865PERL Mobo

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Konstantin

New Member
Joined
Jan 17, 2012
I still have an old computer: Intel D865PERL, 2.4 Ghz P4 CPU, 2 x 1 GB KingMax DDR SDRAM at 400 Mhz.
Unfortunately 2 GB of memory is often proves too low, so I would like to use at least 2.5 GB, 3 GB, or maybe 3.5 GB of RAM. 4 GB would be optimal, but I don't have enough modules currently to reach this goal due to an erroneous module.

The mainboard has 4 slots for RAM modules and I have 8 RAM modules in total: 4 x 1 GB, 2 x 512 MB, 1 x 256 MB @ 400 Mhz (all of them are PC3200), 1 x 256 MB @ 266 Mhz (PC2100). Unfortunately one of the 1 GB modules is bad, Memtest86+ gives a lot of error messages, so in theory I could use it only with Linux, applying the BadRAM kernel service which exclude the bad memory pages from usage.

So I would like to install as many RAM modules into my old motherboard as possible, and I don't care with sub optimal timings, or low operating frequency, such as using 400 Mhz modules at 333/320 Mhz or 266 Mhz.

I loaded a Live Windows XP variant from CD and I used the CPU-Z utility to examine all of the modules, to get the supported timings from the SPD data stored in the RAM modules, the so called JEDEC timing table.

My modules are the following:
Code:
1 GB KingMax (older series)

Size	1024 MBytes
Max bandwidth	PC3200 (200 MHz)
Part number	MPXD42F-D8KT4B
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	2.0-3-3-6-n.a. @ 133 MHz
JEDEC #2	2.5-4-4-7-n.a. @ 166 MHz
JEDEC #3	3.0-4-4-8-n.a. @ 200 MHz

---------------------------------------------------------------
1 GB KingMax (older series)

Size	1024 MBytes
Max bandwidth	PC3200 (200 MHz)
Part number	MPXD42F-D8MT4B
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	2.5-3-3-6-n.a. @ 133 MHz
JEDEC #2	3.0-4-4-8-n.a. @ 200 MHz

------------------------------------------------------------------
------------------------------------------------------------------

1 GB KingMax (newer series, I have 2 pieces of this, but one of them is bad, memtest86+ produces errors, maybe I can use it with Linux BadRAM kernel service)

Size 1024 MBytes
Max bandwidth PC3200 (200 MHz)
Part number MPXD42F-D8KT4B
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 2.0-3-3-6-n.a. @ 133 MHz
JEDEC #2 2.5-4-4-7-n.a. @ 166 MHz
JEDEC #3 3.0-4-4-8-n.a. @ 200 MHz


------------------------------------------------------------------
my older modules (PC3200 / 400 Mhz)
------------------------------------------------------------------

512 MB PQI module

Size	512 MBytes
Max bandwidth	PC3200 (200 MHz)
Part number	
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
------------------------------------------------------------------
512 MB PMI module

Size	512 MBytes
Max bandwidth	PC3200 (200 MHz)
Part number	
Serial number	00303430
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	2.5-4-4-8-n.a. @ 200 MHz
-------------------------------------------------------------------
256 MB Samsung (GEIL) module

Size 256 MBytes
Max bandwidth PC3200 (200 MHz)
Part number CL25-3-3DDR 400
Serial number 20020725
Manufacturing date Week 03/Year 01
Number of banks 1
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 2.5-4-4-8-n.a. @ 200 MHz

-------------------------------------------------------------
An even older 256 MB module, only PC2100 / 266 Mhz
-------------------------------------------------------------
256 MB Q2 module (266 Mhz)

Size 256 MBytes
Max bandwidth PC2100 (133 MHz)
Part number 
Number of banks 1
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 2.0-2-2-5-n.a. @ 100 MHz
JEDEC #2 2.5-3-3-6-n.a. @ 133 MHz

JEDEC 133 MHz lines correspond to 266 Mhz memory frequency, 200 Mhz -> 400 Mhz, 166 Mhz -> 320/333 Mhz memory operation. One can see that not every modules support all the possible frequency, but they also works at lower Mhz, because I get some of the data from an even older mainboard, Kobian KT266a FDSX, which operates the memory modules at 266 Mhz.

My question is what modules should I choose from the 7 modules and what timings should I set in the BIOS of the mainboard to get the most possible GB of RAM working?
 

Johan45

Benching Team Leader Super Moderator
Joined
Dec 19, 2012
I would try 2x1GB and the 2x 512MB at 400 with 3-4-4-8 that should have them bot in dual channel. If they work together. You may want to leave timings on auto. Just something you're going to have to experiment with I think but that's where I'd start