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How do I use all DIMMs in X58 Motherboard

M

mkperrett

Junior Member
I have 12GB (6x2) memory plugged into my ASUS P6X58D MB.
AMD BIOS only recognizes 8GB (seen at boot up).
CPU-Z recognizes the 12GB, but last two DIMMs are "not installed".
-- All 12 GB show identical results
MEMTEST86+ 'sees' 12GB, but only tested to 8GB.
Set DRAM voltage to recommended 1.5V, Timing to 9-9-9-24
Pressed "MEMOK" started blinking per MB Manual.

Power: Corsair HX850W (nothing above 45C, CPU, Graphics or MB)
MB: P6X58D, BIOS 0301
Memory: 6x2GB Corsair CM3X2G1333C9
Processor: Intel i7-975 (Not OC)
Graphics: HD 5970 (Not OC)
OS: Windows 7, 64 Bit Ultimate

Any suggestions how to "install" / use the whole 12GB?
 
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What CPU cooler are you using? (not temperature related but some coolers due to their mounting mechanisms can cause these symptoms)

Try 1.64V DIMM in BIOS.

If no change then remove cooler, CPU, make sure pads on CPU and pins inside LGA1366 socket are clean - NEVER touch them or put anything in there! Re-install CPU and cooler and try again.
 
CPU Temp has never been above 50C. Cooler is a Cooler Master Hyper 212 Plus in a Cooler Master ATCS 840 chassis.
Not really relevant, but the only thing not defined are that my drives are 2x Patriot 128GB / RAID 0 and a WD 1.5TB data drive.

BIOS is indeed the latest.
Thanks for the input, Michael
 
If you pull 6GB out, does it register 4GB or 6GB? Could be a bad channel or you've inadvertently set it up as dual channel instead of triple channel.
 
What is the speed of the chips? How many ranks? Registered or unregistered? Since the processor drives that RAM now you will often run in to hard blocks set by intel in the processor. Example being that 1600mhz modules often will not work in groups of 6 etc. Also a firmware update might be required to get the updated microcode in to the processor to allow it to use looser standards. It used to be that all i7s would run 6 chips @ 1066mhz and no more and recently a microcode update came out that would allow 6 x 1333mhz.
 
Rubycon said:
What CPU cooler are you using? (not temperature related but some coolers due to their mounting mechanisms can cause these symptoms)

Try 1.64V DIMM in BIOS.

If no change then remove cooler, CPU, make sure pads on CPU and pins inside LGA1366 socket are clean - NEVER touch them or put anything in there! Re-install CPU and cooler and try again.
Click to expand...

Hate to disagree with a moderator, but anything over 1.6V is considered getting dangerous if I remember correctly. If the RAM won't work at SPD settings at stock speeds, then either the RAM or motherboard is at fault.

Also, I have never heard of a CPU mounting mechanism causing memory problems? Link to a similar case?
 
Golgatha said:
Hate to disagree with a moderator, but anything over 1.6V is considered getting dangerous if I remember correctly. If the RAM won't work at SPD settings at stock speeds, then either the RAM or motherboard is at fault.

Also, I have never heard of a CPU mounting mechanism causing memory problems? Link to a similar case?
Click to expand...

The actual limit is 500 mV between QPI and memory. If your VTT is 1.3 the safe upper VDIMM is 1.80! 1.65V is actually considered the safe limit for STOCK QPI.

Check with the ram manufacturer. Many modules will indeed have problems at default settings with less than 1.6V.

I experienced the issue with several X58 boards and this was discussed on Xtremesystems as well as EVGA forums regarding excessive mounting pressure causing problems with IMC on Nehalem processors.
 
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Rubycon said:
The actual limit is 500 mV between QPI and memory. If your VTT is 1.3 the safe upper VDIMM is 1.80! 1.65V is actually considered the safe limit for STOCK QPI.

Check with the ram manufacturer. Many modules will indeed have problems at default settings with less than 1.6V.

I experienced the issue with several X58 boards and this was discussed on Xtremesystems as well as EVGA forums regarding excessive mounting pressure causing problems with IMC on Nehalem processors.
Click to expand...

Interesting about the mounting pressure. I looked it up and Intel recommends no more than 1.65V for memory. I'm running a mild 3.2Ghz on my i7 920 and the voltage is set to 1.6V with 12GB of memory installed (6x2GB) and it has been smooth from day 1. I don't know that I had to bump the voltage up, but I figured it helped back when I was using DDR2 on a socket 775 board, and I just bumped it up because it was below Intel's recommended threshold I suppose.
 
Try lower speed grades as well. Most RAM will not at advertised speeds with that many sticks populated.

My Asus boards also works that way. It starts disabling slots as you gradually turn up the clockspeed on the RAM.
 
I have to ditto Rubycon and emphatically. Apparently she is not just another pretty face floating around on a boat (not intended to be an insult R that I said "boat") in the Caribbean ... saying that with a great deal of envy.()🙂

I have this same m/b. I bought CORSAIR DOMINATOR 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model TR3X6G1600C7D G ... copied from my Newegg order. I did this because Kyle Bennett over at http://www.hardocp.com/ made a video over clocking some ASUS X58 m/b with this exact RAM and 12 GB of it successfully.:awe:

Some where in AnandTech reviews I also read in detail about OC-ing the i7 920. AnandTech is a little more personable, and has a lot of forum activity all contributing to credibility.

My P6X58D is OC-ed to 4.4 GHz and all 12 GB RAM is recognized. I Googled & yahoo-ed your RAM and can find very little technical information about it, specifically the voltage it is rated for. My 1st inclination is to send it back ASAP while you can. If that is not possible then I would go with R's recommendation about setting voltages. She is right on. The little that I can find out about this RAM is that it is a higher voltage RAM than even 1.65V .. but that does not mean that you cannot exceed that value per her recommendation.

Read her comments carefully. If you are not comfortable with that, ask more questions. I have this m/b. R apparently has more experience with more m/b & RAM.
 
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