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What does this mean? "One DIMM per channel only" - Page 3

post #21 of 41
Quote:
Originally Posted by frW;15351098 
I see, so if I run my RAM in 1600MHz it's the same as running XMP in this case? I still can only run one DIMM per channel? I didn't enable XMP but only set the DRAM Frequency to 1600MHz and the other frequency to 2400MHz ( DRAM Freq. * 1.5 ).

Just because two-dimms per channel is not supported doesn't mean it's not likely to work.

It probably will. The memory should handle rated speeds fine, the issue is the memory controller on the CPU.

The issue is that neither the automatic nor XMP timings/voltages are likely going to be completely stable, so you will probably need to do some manual tweaking.
Quote:
Originally Posted by frW;15351098 
Ok I will try HCI Memtest as well to see if it is stable, but if the "basic" memtest-dos-program finds an error, it's most certain that HCI Memtest will to?

Yes.

If it fails in Memtest86+, I wouldn't even bother booting into Windows with those settings.
Quote:
Originally Posted by frW;15351098 
I will check the voltages when I get back home, is it a solution for me to just run the RAM in 1333MHz instead of 1600MHz?

This might work, but if you want the best performance you'll spend the little bit of extra time and effort to get 1600 stable. You will also likely be able to get a much faster uncore clock than 2.4GHz, if you wish.

Get a list of what all the XMP profile timings are. Use CPU-tweaker (http://www.tweakers.fr/cputweaker.html) or ADIA64 to do this. It will serve as a useful starting point when making tweaks to your subtimings.

You want to open CPU-tweaker, click SPD, and find the XMP profile, like this:

CPU-Tweaker_SPD.png
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post #22 of 41
Quote:
Originally Posted by frW;15351115 
I think it's set to 1.2v, is that too high? Yeah I know X58 can handle 1.65v just worried the RAM's cannot.

A side note, in BIOS I set the DRAM voltage to 1.654 because the other option was 1.64, is that "correct"? If I select 1.654 I get a big red warning in BIOS about not using too much voltage, but in Windows it says it's "exactly" 1.65v.

If your RAM is rated at 1.5v, set that in BIOS, it should be able to run stable at that voltage.

QPI/Vtt 1.2v, are you sure? The memory chips must be very good now. But figure you won't need more to run 1600MHz. You could lower it a bit since you are not overclocking the BCLK by increasing memory multiplier.

Next thing is tweak the timings. Don't know what you plan with your system or running what applications. If just for regular 24/7, I'd say just use the RAM rated specs. It will take a lot time to stabilze 6 x 4GB to tweak the timings and voltage when you don't need faster RAM.
Edited by Ken1649 - 10/18/11 at 12:57am
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post #23 of 41
Thread Starter 
Quote:
Originally Posted by Blameless;15351176 
Just because two-dimms per channel is not supported doesn't mean it's not likely to work.

It probably will. The memory should handle rated speeds fine, the issue is the memory controller on the CPU.

The issue is that neither the automatic nor XMP timings/voltages are likely going to be completely stable, so you will probably need to do some manual tweaking.



Yes.

If it fails in Memtest86+, I wouldn't even bother booting into Windows with those settings.



This might work, but if you want the best performance you'll spend the little bit of extra time and effort to get 1600 stable. You will also likely be able to get a much faster uncore clock than 2.4GHz, if you wish.

Get a list of what all the XMP profile timings are. Use CPU-tweaker (http://www.tweakers.fr/cputweaker.html) or ADIA64 to do this. It will serve as a useful starting point when making tweaks to your subtimings.

You want to open CPU-tweaker, click SPD, and find the XMP profile, like this:

CPU-Tweaker_SPD.png

Okay I think I understand. I wonder why there is 6 slots if it's not supported to use them all at once?

After I've gotten the XMP profile settings, what do I do with that? How do I know what kinds of settings to tweak?

The RAM timings are 9-9-9-24, do I increase or decrease to get more stable?

Thanks
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post #24 of 41
Quote:
Originally Posted by frW;15351238 
Okay I think I understand. I wonder why there is 6 slots if it's not supported to use them all at once?

Officially, LGA-1366 only supports 800, 1066, and maybe 1333 (I'd have to look it up). DDR3-1600+ is totaly unoffical, even with only three DIMMs.
Quote:
Originally Posted by frW;15351238 
After I've gotten the XMP profile settings, what do I do with that? How do I know what kinds of settings to tweak?

Can you post the XMP timings?
Quote:
Originally Posted by frW;15351238 
The RAM timings are 9-9-9-24, do I increase or decrease to get more stable?

The core timings are probably fine, it's the sub timings that are likely less than ideal.

Anyway, higher numbers are looser.
Edited by Blameless - 10/18/11 at 1:42am
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post #25 of 41
Thread Starter 
I'll post a screenshot as soon as I go home later today.

Another question on the HCI Memtest, how do I optimally run it? Someone told me to run 12 instances and divide the memory left to each of them.

Is that ideal? Or can I start one and set it to ~23GB, which is the free memory after windows boots.
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post #26 of 41
Quote:
Originally Posted by frW;15351539 
Another question on the HCI Memtest, how do I optimally run it? Someone told me to run 12 instances and divide the memory left to each of them.

This was good advice.

One thread per logical core, memory use divided between them evenly, with a total use of about 90% of your physical memory.

Do not attempt to use all currently available memory. You want to leave a gig or two of headroom so you can do other basic tasks, and so you don't run into swapping (which will either slow things down so much as to not adequately test the ram, or might lock up the system if you have an insufficiently sized page file).
Quote:
Originally Posted by Ken1649;15351201 
QPI/Vtt 1.2v, are you sure? The memory chips must be very good now.

QPI/VTT doesn't have much of anything to do with memory ICs. I think manufacturers have just started realizing that you don't need stupid QPI/VTT for lower uncore clocks.

My DDR3-2000 still tries to set 1.65v QPI/VTT.
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post #27 of 41
Quote:
Originally Posted by Blameless;15351505 
Officially, LGA-1366 only supports 800, 1066, and maybe 1333 (I'd have to look it up).


Yeah its 800 and 1066 officially although,as we all know,you can run much higher in most cases smile.gif
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post #28 of 41
Thread Starter 
Quote:
Originally Posted by superj1977;15351574 
Yeah its 800 and 1066 officially although,as we all know,you can run much higher in most cases smile.gif

So not even 1333? How can I find out if 1333 is officially supported for my CPU/Mobo?
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post #29 of 41
Quote:
Originally Posted by frW;15351638 
So not even 1333? How can I find out if 1333 is officially supported for my CPU/Mobo?
Your CPU' info here

But like i say,we all know in pretty much every case that you can run higher.
I have an overclock profile in my bios to run my mem at 2000Mhz for benching but i dont like using 1.44v qpi/vtt for 24/7 eek.gif

rHc8h.jpg
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Le Box of Black
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post #30 of 41
Thread Starter 
Okay, so that means that I could use the RAM at 1066MHz without any problems at all? But that would be 25% decrease in performance I guess.

It's funny that you buy a ridicilus expensive CPU and it can't handle the most common RAMs? What's up with that?
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My System
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OCZ Vertex 3 120GB Windows 7 Enterprise SyncMaster P2770 Microsoft Ergonomical 4000 
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