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post #11 of 25
Thread Starter 
If they are advertising 8-8-8-24 at 1.35v and they're not actually able to run at those timings, isn't that deemed eligible for RMA?
Btw, I had one stick of 8GB RAM run for 7 1/2 hours without errors in memtest. The other 8GB ran memtest for several hours (4 passes) without errors.
I put them in together in a xoxo configuration on the motherboard and received 2 errors in memtest in first 3 hours. (I can post the screenshot if needed)

Should I RMA the RAM?

Edit: I put in my old triple channel kit (3x2GB mushkin) to see if maybe it's the motherboard and it has been running memtest for 5 hours so far without errors.
Edited by Zensou - 3/17/13 at 4:13pm
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post #12 of 25
Thread Starter 
Ran my old triple channel kit in memtest over night with no issues.
I put in 1 8GB stick in 3rd slot before bed and ran memtest for 8 1/2 hours, no errors. This morning, before I left for class, I replaced the 8GB stick with the other 8GB stick in same slot, so far 4 and a half hours without errors. Yet, when they are together I receive errors in first 3-4 hours. Could it possibly be the motherboard not being able to sustain the RAM?

Also, not sure if this is related but Memtest shows the RAM as 6-6-6-20 1600MHz but the BIOS shows the RAM as 8-8-8-24 (as it should be), CPUZ also shows 8-8-8-24. Is memtest known to be glitchy like this or could this be another sign of instability?
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post #13 of 25
If the modules runs fine individually, but not as a pair, it could be an issue with the IMC in your CPU, or motherboard quality related. Check the VCCSA in the BIOS and increase it by 0.1v and see if that helps. DO NOT go higher than 1.3v (some say 1.2v) on VCCSA. Some XMP+ profiles actually set VCCSA to 1.3v which is too high in my opinion, and I actually got improved stability in multi-channel RAM configurations by decreasing the 1.3v to 1.2v in those cases.

XMP profiles aren't guaranteed to work in all motherboard/process/RAM combinations. The RAM manufacturer will probably RMA the set for you though.

Regarding your 3-channel kit passing memtest, take ONE of those modules OUT so you are running in the two colored sockets. With 3 modules, you're still running single channel. With 2 modules or 4 modules (even number) you are running dual channel.

Greg
post #14 of 25
Thread Starter 
There are no colored sockets on the Z77 Extreme4. Also, I'd rather not mess with voltages just to get stability at stock settings, I'm trying to figure out what part is at fault here. If I have to change a voltage for it to run on default settings then that should be a problem and deemed eligible for replacement. If it's an issue with the motherboard, I will RMA the motherboard. CPU? I will RMA CPU, etc.

And also, I'm pretty sure the VCCSA voltage should not be touched, I have read that it is meant to be fixed. What you are most likely thinking of is the VCCIO. I am not too sure though. Either way, changing voltages to get stability at stock does not suit for me.
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post #15 of 25
I said VCCSA and I meant it. That's the integrated memory controller voltage. The XMP profile on some RAM will adjust the VCCSA, and in some cases it adjusts it too high. I have some Corsair Ballistix Tactical DDR3-1600 CL8 RAM that will set XMP+ profiles for 8-8-8-24 with 1.50v DIMM voltage and 1.30v VCCSA. The voltage comes up PINK in my ASUS P9X79 UEFI BIOS because it's way out of the safety range. VCCSA for stock JEDEC 1333 RAM on "Auto" is closer to 1.0-1.1v. That being said, I've manually set the RAM at 1.20v and it runs stable with Memtest 86+ with quad channel all night long. If I drop it to 1.15v, it will get a memory error. If I run it at 1.3v (the XMP setting) it will get an error. The point of my story is this - XMP profiles aren't guaranteed to work in ANY motherboard, and while it may have passed the test at those speeds on some other brand motherboard at the memory manufacturer, it might not pass on yours.

I asked if your XMP profile sets your VCCSA voltage, and if so - what is it set at?

By the way, there are no Crucial 4GB or 8GB modules on ASRock's qualified vendor list for that motherboard. Not saying it won't work, just saying you're running RAM that hasn't been tested or qualified by the manufacturer. Sometimes that means you're stuck with JEDEC timings and voltages.


Greg
Edited by hammong - 3/18/13 at 8:43pm
post #16 of 25
Thread Starter 
Hi Greg, again, thanks for your help.
1. XMP does not change the VCC setting, it is kept at auto (which is 0.925 at auto)
2. I am running prime95 blend at the moment at 2x8GB 8-8-8-24 1.5v (xmp profile 2) and not getting instant rounding error of .5 when should be less than .4.
3. All the XMP profile seems to change is voltage, nothing else.
4. If it proves to be stable for 10+ hours at 1.5v would that be an issue with the controller in the CPU or motherboard or the RAM? Because if I can return the RAM and get a set of ram that functions at 1.35v I will.
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post #17 of 25
Thread Starter 
Update: The system has been stable for 13 hours in Prime95 Blend test with 8-8-8-24 timings at 1600Mhz @ 1.5v.

Not sure if that an issue with the ram, the imc or motherboard.
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post #18 of 25
I don't think you have a problem. Not all boards will run 1.35v overclocked RAM without error. If the RAM runs at 1.5v then I think you should leave it at that setting and be satisfied with it.

Am I correct in assuming that the XMP profile is setting the RAM to 1.35v? 1.35v is considered "low voltage" RAM and generally speaking isn't usually as fast as the 1.5v XMP profile RAM. The exception is the newer Samsung 30nm DRAM chips, which are low voltage and have some pretty fantastic overclocking possibilities. Some low voltage RAM providers are using OEM Samsung 30nm chips for thier modules. Keep in mind that even the Samsung stuff is RATED at DDR3-1600, 1.35v, CL9 - anything faster is OC and might require higher voltage.

If that RAM is running 8-8-8-24 @ 1.5v and stable, your IMC and motherboard are absolutely fine. The RAM, in my opinion., is fine too.

Greg
post #19 of 25
Thread Starter 
Yes, the XMP profile is setting it to 1.35v because it is low voltage ram. If you check the newegg link, it specifies that it is 1.35v ram.
again, there are 2 xmp profiles.

1) 1600mhz 8-8-8-24 1.35v
2. 1600mhz 8-8-8-24 1.5v

After running blend without errors for 13 hours I have kept timings and speed the same and lowered the voltage to 1.40v. So far I have been running blend for 5 hours without error.
I have filed for advanced replacement with newegg either way, I am going to make sure that it is not the ram but the motherboard. Just in case. Thanks for your help, I will +rep you.
It is just unfortunate that you do not agree with me on receiving what was advertised. Seems I just don't have the sort of cash to throw around like you.
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post #20 of 25
Based on your situation, I've been doing some research and it seems that ASROCK Extreme4 might not support low voltage RAM. Something that clued me in was that your RAM has two XMP profiles, one for 1.35v and one for 1.50v. The 1.50v XMP profile is there SPECIFICALLY for boards that don't support LV RAM. Yours might be one of them, and it would definitely support the testing results you've indicated. I just searched Google and I found numerous Extreme4 users with 1.35v ram problems that were resolved by running 1.5v profiles.

It has nothing to do with cash. I respect your desire to buy something advertised as 8-8-8-24 1.35v and expecting it to run at that speed and voltage. I also have to respect the fact that timings and voltages are very much an uncertain entity, and that some boards won't run at the advertised settings. A different batch of RAM might work better, it might work worse. Only way you are going to figure that out is to swap it and hope the silicon lottery pays dividends. =)


Here's an interesting read for you:

http://forums.tweaktown.com/asrock/51701-z77-extreme-4-2x4-go-crucial-tactical-lp-ddr3-1600-8-8-8-24-1-35v-bsod.html

Go down to post #8, where it says:

"Well, assuming the 2x4GB kit you have is P/N'd BLT2K4G3D1608ET3LX0, in looking at the reviews for them in NewEgg don't feel alone. Almost half of the reviews there state they wouldn't run 1600 at 1.35v, but instead req'd 1.5v. Now knowing you're not alone, this is beginning to evolve into a topic that should maybe be addressed/posted at the Ballistix section on Crucial Forums. Or by contacting their Tech Support via email or phone." (posted by wardog)

I know you have 8GB modules and the post talks about 4GB modules, but it's a similar scenario. People buying 1.35V overclocked RAM that requires 1.5V to run stable.

Greg
Edited by hammong - 3/19/13 at 10:03pm
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