Memory Speed Problem

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bd22250

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Sep 30, 2006
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Hello,

I have an Asus A7N8X Deluxe motherboard that had 2 sticks Samsung DDR PC3200, Unbuffered, Non ECC, DDR400 (512 meg each) that ran at 200mhz on mem check during startup. I recently upgraded with 2 sticks Crucial DDR PC3200, Unbuffered, Non ECC, DDR400 (1 GB each) only to experience random reboots, sometimes minutes after starting Win XP, sometimes hours.

After changing the Memory Frequency in the Advanced Chipset Features from 200% to SPD (autodetection) I have had no more random reboots. It now reads 166mhz on startup.

Would someone please explain why the Crucial memory (only difference is the megs) will not run at 200% like the Samsung did?

Thanks for the help.
 
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Jan 11, 2007
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that board is very touchy about ram, the one i had i put in 2 sticks of kington hyperX it would not even boot i open the bios and upped the voltage by .01 and it boot ok and was stable
 

bd22250

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Sep 30, 2006
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The Samsung runs at 200%, resulting FSB frequency of 400%. The new Crucial runs at 166%, resulting FSB frequency of 333%.
 

crjdriver

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Jan 2, 2001
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You are not understanding. That is a percentage. My question is what speed does the samsung memory run at when you set it to spd in the bios. It would run at pc3200 [400], pc2700 [333], etc.

Note your board does not support all memory. Did you order this memory from the crucial site using the memory configuration?
 

bd22250

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Sep 30, 2006
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In the "Advanced Chipset Features", "Memory Frequency" was set to 200% showing a "Resulting Frequency of 400%." Yes, I did use Crucial's memory configuration tool and then ordered the memory from Newegg. The exact memory Crucial recommended.
 
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If those differing sticks of RAM run with different CAS latencies or other timings then it could possibly explain the instability. They are both rated as DDR400 but one could have a CAS latency of 2.5 whereas the other might have a CAS latency of 3. So if you have timing set manually to 3, and try to run the 2.5 CAS sticks at full speed they could become unstable. So timing is something you might want to look at in the BIOS.

In fact, I would recommend that you first reset the BIOS and try to see if all of the RAM will run at their full 400MHz that way.
 
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Jan 10, 2006
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WarC said:
If those differing sticks of RAM run with different CAS latencies or other timings then it could possibly explain the instability. They are both rated as DDR400 but one could have a CAS latency of 2.5 whereas the other might have a CAS latency of 3. So if you have timing set manually to 3, and try to run the 2.5 CAS sticks at full speed they could become unstable. So timing is something you might want to look at in the BIOS.

In fact, I would recommend that you first reset the BIOS and try to see if all of the RAM will run at their full 400MHz that way.
i think the problem i am having relates to the cas timing
http://forums.techguy.org/hardware/549274-latencies-important-when-matching-ddr2.html

what do those numbers mean?

5-5-5-12
 

bd22250

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Sep 30, 2006
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14
Hello,

I finally got things to work with no more random reboots. I now have 1 gig sticks in all three slots from Crucial, for a total of 3 gig. You were right WarC, it was all in the CAS latencies. After reading many posts on the Asus website and a little tweaking in my Bios things are once again running smoothly. Many Thanks.
 
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