SPD data question

[richard.murphy]

I purchased one set of CM2X1024-6400C4DHX about a year ago and another set last week. I notice that the older set reports SPD data of 5-5-5-18-22 at 400Mhz and the newer set reports SPD data of 4-4-4-12-22-2T at the same clock rate. Consequently, my MB BIOS goes with the 5-5-5-18-22 setting. First, why do these PC2-6400 with the same part number have different SPD data? Secondly, can I just force my BIOS to use the 4-4-4-12-22-2T setting? One other thing I have noticed is that the older set shows the tighter 4-4-4 data for 200Mhz.

[RAM GUY]

Please post a screen shot of both modules using CPU-Z in the SPD Tab.

But most likely the older modules were made before the implementation of EPP Profiles.

[richard.murphy]

The slot #2 has the older memory, slot #3 the newer. The last shot shows the overall memory speed as selected by the MB. See attached PDF.

 

Richard

[richard.murphy]

It does not look like the PDF attached to the first reply. I'll try again.

 

http://www.asktheramguy.com/forums/attachment.php?attachmentid=5556http://www.asktheramguy.com/forums/attachment.php?attachmentid=5557

http://www.asktheramguy.com/forums/attachment.php?attachmentid=5558

[richard.murphy]

I guess I can try setting my memory parameters to 2.1V 4-4-4-12-2T as this is the EPP data. Since Corsair says the older memory was tested at these settings and the SPD info is due to the JEDEC standards lagging behind the product availablity, I will cross my fingers that this will work! Anyone have any alternate suggestions?

[RAM GUY]

You look to have one set that was made before EPP was developed but with 4 modules this would apply.

 

With 4 modules I would suggest setting the memory frequency at DDR667 and set the memory Voltage to 2.1 Volts and set the NB/MCH/SPP Voltage to +.2 Volts as well and test the system with http://www.memtest.org. In addition, with some MB's (Mostly ASUS) you have to disable legacy USB in the bios when running any memory test.