asus sabertooth x79 - memory issue

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Hello all, I have been having some issues with my new memory. I first bought thesehttp://www.newegg.com/Product/Product.aspx?Item=N82E16820233230

I installed them with no problem. I set them to the XMP profile, and they worked in all stress tests. No problems at all. So a week later I decided to buy another set. Which means I now have 8x4gb sticks of 2133 ram.

Before I go on, I would like to mention that I also have a i7-3930k.

I installed them, and everything booted correctly, but within a few seconds of stress testing, my system blue screened. So I thought the new ram was faulty. So I tested every stick of ram with 5 passes of me test. Every stick was fine. So next I tried the four new sticks combined, and I had no issues.

I then thought the motherboard dimm slots were faulty. So I tested each slot individually. No issues. So installed all 32gb and decided to try again, except this time strayed away from the xmp profile and tried just the optimized defaults. Everything went fine, all tests went smooth. 10 passes of memtest showed no errors.

When I bump it beyond 1866 MHz, I start getting errors. So going by advice I read on this forum, I tried some slight over clocks and increased voltages. I continued to get errors. Eventually I ended up starting from scratch and tried the oc tuner. It bumped up my cpu turbo to 4.1 GHz, and my memory to 2024 mhz. I ran several tests, and it was stable. I ran 20 passes of memtest and no errors.

At this point I decided I didn't want the CPU over clocked that much because I would prefer things a bit cooler, and i would like to have that extra $200 that i spent towards the 2133 to actually be utilized. So I tried reducing the CPU clocks, and increasing the memory to just under 2133. I relaxed the timing some, and increased the voltage for the ab/cd to 1.6v

Men test ran okay for a while, then around test 5 I started getting errors, and even more when test 6 came around. I tried increasing other memory related voltages, and relaxing the timing more. I still continued to get errors. The only difference was that I would get maybe 1 or 2 fewer errors in memtest per pass, per voltage/clock change iteration .

Can anyone help me out? I would like to have the full power I payed for.
 
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alexoiu

alexoiu

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Nov 1, 2012
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Hi,
I 'm not for OC-ing, but check here:
"As a matter of fact, Intel emphasizes the fact that it's extremely easy to reach high memory clock rates now. And you can keep your system stable by changing two voltages only. These are VDDQ, which is applied directly to the modules, and VCCSA, which powers the system agent and memory controller. It is not recommended to increase the former above 1.65 volts to safeguard the CPU against damage or degradation. The latter voltage is 0.925 volts by default and you can increase it a little to make your system more stable at high DDR3 clock rates."
http://www.xbitlabs.com/articles/memory/display/ivy-bridge-ddr3_2.html

From Intel: VCCSA Voltage for the system agent min 0.879 def 0.925 max 0.971V
http://www.intel.com/content/dam/www/public/us/en/documents/datasheets/2nd-gen-core-desktop-vol-1-datasheet.pdf
 
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Andrew Mumford

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Jun 6, 2013
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10,510
I very much appreciate the response. However, I have already tried pumping up the voltage for the memory just one notch under 1.7v. I have also already tried boosting the vccsa, but the OC tuner usually sets it to 1.3v on its own..
 
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raja@asus

raja@asus

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Sep 28, 2011
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A few things you need to bear in mind.

1) The XMP profile is for a single kit only - not two kits combined. The SPD and XMP is programmed with the original density in mind. There is a reason that single kits of 32GB and upwards command a price premium.

2) You are going to need to adjust some of the timings manully to get this kit stable. You may not be able to reach the same timings and speed as a single kit easily.

3) Alexiou is correct about needing to change the voltages, but it will likely take relaxing some of the primary, secondary and third timings in the DRAM timing section of UEFI as well.



Always buy a single memory kit rated at the timings and density you wish to run if you are looking for an easy ride. High speed kits that operate at frequencies well beyond stock supported DRAM speeds of a platform are trickier to get stable when you combine kits like you have. Some people get lucky, others as you have found don't.


-Raja

 
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Andrew Mumford

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Jun 6, 2013
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Thank you for your reply.

I knew getting a second kit would more than likely present these types of issues. I would have preferred getting a single 32 GB kit at the frequency of 2133, but alas, they are hard to find. And the brands that are available (about two), I don't particularly favor. This was the next best thing.

Following a post by Jaquith on a different thread similar to my question, I upped my voltages and made other tweaks per his instruction. However, those tweaks were for 1600 MHz . I figured I would have to get more aggressive with the voltage increases. I'm just not sure which areas specifically to boost. They are already pretty high.

Also, as a follow up to the OC tuner. As I said, I selected that option in the bios and let the system choose the settings. So far that has been the most stable. 2022 MHz and the voltages are pretty low close to xmp, but only elevated slightly. I got a blue screen after roughly 4 hours of operation. Even though me test showed no errors.
So I've been running memtest for the past 10 hours. Got 4 errors.

I will try relaxing the secondary timings and third timings as well to see if that improves stability.

I understand it will be harder to achieve the same timings and frequency as a single kit. My goal is to get close.





 
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Andrew Mumford

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Jun 6, 2013
3
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10,510
Here is an update to my situation. I managed to get the memory stable and running at stock voltages with 1866. This is clearly unacceptable. I will attempt to slowly raise the frequency of the memory and voltages of respective components, until I can no longer get it stable under reasonable voltages.

Any additional suggestions or guidance would greatly appreciated.
 
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