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Discussion Starter #1
I'm working on a new rig and (may?) have run into a memory incompatibility issue.

The motherboard is the Asus Rampage III Formula and the memory is Ocz Platinum PC3-12800, 6-8-6 latency version. I have the 3x2GB sets (two of them), model number is OCZ3P1600C6LV6GK.

I've tried different channels and swapping them around in all cases each 6GB set is recognized as only 4GB. If I put both sets in it registers at 8GB instead of 12GB. I've tried setting voltages and timings manually and leaving them on auto. I have yet to get the MB to see all of the available memory.

I can see on the internet people using this memory with the Asus Rampage III Extreme and I assumed it would work on the Formula as well.

Is what I'm seeing the result of memory incompatibility? Or is there a setting/jumper I need to change?

Thanks.
 

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Chainsaw noise far off
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Well sometimes it has to do with your socket having bent pins,or your cpu cooler being too tight.Just thought I would throw that out there since I have seen this issue caused by these things.
 

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Discussion Starter #3
Sorry...do you mean bent pins on the CPU socket or something bent with the memory itself?

I'm 99% certain I put the processor in without bending pins but I can certainly back off the tightening of the cooler to test when I get home.
 

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Too agressive Round Trip Latency (RTL) settings can also cause the problem you are describing. You will see this group of settings for channels A, B, C under the DRAM Timing Control section of the Bios. Try increasing the value for each channel by 1 or 2 notches from their current settings and see if it helps.
 

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Discussion Starter #6
I looked at the RTL timings. They were A - 51, B - 0, C - 53. I bumped those up a little no effect.

I also untightened the CPU cooler a little, no effect.

I borrowed some other DDR3 memory from a friend, same problem, only 2/3 of the memory shows up.

Any other ideas? I'm guessing the motherboard is the issue at this point but welcome other comments.
 

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Quote:

Originally Posted by Colorado View Post
I looked at the RTL timings. They were A - 51, B - 0, C - 53. I bumped those up a little no effect.

I also untightened the CPU cooler a little, no effect.

I borrowed some other DDR3 memory from a friend, same problem, only 2/3 of the memory shows up.

Any other ideas? I'm guessing the motherboard is the issue at this point but welcome other comments.
try running the cpu with the stock cooler or without tightening the heatsink down at all, just to see if all the memory shows up as usable. you might see some effect by bumping up the qpi voltage. if neither of those work, it's almost certainly the mobo.
 

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RTL setting for any active channel should never be 0. Channel B showing 0 means the ram in one or both of the middle slots is not being recognized. As has been suggested, you should remove the cooler and check for bent pins or debris in the CPU socket and check the middle ram slots as well. Remount the cooler with less pressure if possible and make sure the M/B is mounted in a case or test stand if you're not using a backplate to prevent excessive bending of the M/B.

Good luck!
 

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Take the heatsync and cpu off and see for bent pins on the socket, that is sometimes a symptom of missing memory detection.

You will have to look very close, as it's very difficult to see any bent pins.
 

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I've had nothing but trouble with OCZ DDR3 kits in the past whether they are on a motherboard QVL or not.

I have seen this type of issue with other members here but only with OCZ kits.
 

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Discussion Starter #11
OK back after a lot of tweaking. My situation is better but I still have an issue so I'm back with more questions. I have done/tried the following:

(1) RMA'ed the motherboard, got a replacement.
(2) Upgraded the power supply to a ATX v2.3 compliant one
(3) Switched from the stock Intel cooler for the CPU
(4) Temporarily tried a different CPU (i7-960)
(5) Temporarily tried different memory (random OEM Dell DDR3 memory)
(6) Tried various memory voltages/timings/settings

Some of the time (randomly) on boot the machine will recognize 12GB. Most of the time it will be only see 8GB. When it does see 8GB, I check the RTL settings and none of them are 0--all are about the same values. It showed this behavior with the alternate CPU and alternate memory attempts.

I will add that regardless of whether the system detect 8 or 12GB on boot it is rock stable. I haven't seen any other memory-related issues post boot.

I guess I have two questions:

Q1: I'm current using OCZ OCZ3P1600C6LV6GK memory. This is DDR3 1600 6-8-6-24. It is not listed on the QVL list for the MB--the list unfortunately was published after I purchased the memory.

Can anyone suggest a detailed list of BIOS settings I should try to be as compatible as possible with this memory? I've set the basic stuff and left the more detailed OC settings alone. But I'm happy to try whatever to see if I can get the MB to recognize all 12GB on boot consistently.

Q2: Given the comments above about problems with OCZ memory, can anyone suggest a different brand/model of memory to use with this MB that is known to be compatible? I would like 12GB, so 3x2GB sticks and 1600 speed if possible.

Thanks.
 

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First of all,there are no 12 GB memory kits in the QVL for this board.Large memory amounts and high speed don't do too well on this board,especially when you throw tight timings in there.Like most X58's.Make sure you are clearing the CMOS,use the Q reset to clear,which bypasses S5 mode which freezes the components.Make sure you update to the latest bios.Also I have heard the chipset cooler can get quite warm when overclocking and affect stability-make sure there is airflow across it.Try aiming for around 1600 mhz and CL8 and see if that shows the full amoount of memory.And again-triple check all the pins in the socket-get a magnifier glass if needed.Check for burnt pins also.If you just can't get those RAM where you want-you might be better of getting a set like these.GSKill Tridents 3x4 GB PC312800 CL7TLess sticks should put less stress on the memory controller,and GSKill has awesome tech support that can walk you through getting everything correct.
 

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It is almost certainly an issue with Asus boards. I have been having similar issues on the last five returned boards from Asus RMA. Their Quality Assurance Specialists agree that there is an issue, but they are not willing to give me a board that actually works. I think it is actually an issue with more recent bioses, as the first revision of the bios supported all the RAM I threw at it!
I have been using Super Talent 2000C8 Chrome's clocked at any speed, and my OCZ XMP's at varying speeds as well...No luck.
Both CPU's recognize all 6 gb of ram when used with my other EVGA X58 SLI LE...So go figure...

This is actually the reason I am not buying another Asus product. Seven months of RMA's only to have a non-functional-to-specification board.
I have spoken with three separate managers, basically everyone at their Tier Three support (For more than three RMA's there is a separate group you talk to). No luck. I have now paid $310 ($299 + one $10 shipping to RMA) for a board that worked for two months, and for seven months and five trips to the post office).
Though, they have now spent more than $100 on sending me boards...
 

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Quote:

Originally Posted by cdolphin View Post
It is almost certainly an issue with Asus boards. I have been having similar issues on the last five returned boards from Asus RMA. Their Quality Assurance Specialists agree that there is an issue, but they are not willing to give me a board that actually works. I think it is actually an issue with more recent bioses, as the first revision of the bios supported all the RAM I threw at it!
I have been using Super Talent 2000C8 Chrome's clocked at any speed, and my OCZ XMP's at varying speeds as well...No luck.
Both CPU's recognize all 6 gb of ram when used with my other EVGA X58 SLI LE...So go figure...
This is actually the reason I am not buying another Asus product. Seven months of RMA's only to have a non-functional-to-specification board.
I have spoken with three separate managers, basically everyone at their Tier Three support (For more than three RMA's there is a separate group you talk to). No luck. I have now paid $310 ($299 + one $10 shipping to RMA) for a board that worked for two months, and for seven months and five trips to the post office).
Though, they have now spent more than $100 on sending me boards...
Well,Asus is having problems,but so are other manufacture's.There are probably more Asus board's out there too.Google X58 and memory problems and you will see it is a chipset problem not just Asus.
 

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Discussion Starter #15
Quote:

Originally Posted by Redwoodz View Post
First of all,there are no 12 GB memory kits in the QVL for this board.
Just for clarification I have two 6GB kits. That is, each kit is 3x2GB and I have two kits.

Also so I can confirm. I can set the timings to 8-8-8-24, but are there any other settings that would make a difference?
 

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Welcome to the forums.

You should fill out your user signature so other know what you have installed on your current pc.
 

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I have the same exact problem too. I have 3x2GB Mushkin DDR3 2000 and only 4GB is recognized. The funny thing is if you load CPU-Z it reports 6GB of Ram. Only 4 GB is recognized in the bios and by windows though. Maybe they can fix it in a bios update.
 

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I have the same too. I have 3x2GB CorsairGT DDR3 2000 c8 and only 4GB is recognized. CPU-Z is reports 6GB in dual chanel of Ram. Only 4 GB in the bios(windows)
 

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wow this is weird, I have 6gb corsair dominators TR3X6G1600C8D G and have no problems at all.

using the x23 multi my ram speed is 1467mhz and I was able to tighten the timings down to 7-7-7-24.

to the OP, do go to your userCP and edit system, it will help us help you!
 
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