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Sabertooth 990FX R2.0 Underclocking RAM, Timing Questions?

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June 4, 2013 11:52:23 AM

Hello :) ,

I have been slowly building a rig with a Sabertooth 990FX R2.0 and FX-8350. I purchased RAM that was on the QVL, and listed on there as :

CORSAIR CMZ8GX3M2A1600C8 (http://www.newegg.com/Product/Product.aspx?Item=N82E168...)

With a timing listed as "8-8-8-24".

When looking in the BIOS, the frequency is running at 1333mhz, and timing is in the 9's, not 8's.

The frequency is easy to change in the Ai Tweaker, but the timing.

Is it safe to change the timing?

Which numbers do i change? When i click on the DRAM Timing Control, there are numerous numbers. I would GUESS it's the numbers that look most like what i'm trying to change, but i would like clarification so i don't tweak things that i ought not to be tweaking.

I have called ASUS twice on these points, and am more confused now than before.

I would like to get the RAM operating at it's advertised speed, but since it's under-clocked, is this technically overclocking as far as the motherboard / CPU are concerned?

Should i just leave the RAM alone?

Cheers!
June 4, 2013 11:58:56 AM

Yes i had to manually time my Ripjaws Z to 8-8-8-24 on the same board.
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June 4, 2013 12:01:19 PM

I had to change mine manually and all is well.
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June 4, 2013 1:07:55 PM

Thank you for the assistance thus far.

I forgot to note, that on the QVL, under the item code for the RAM, it reads (XMP). Does that suggest that i shouldn't mess with the timings / frequency unless i'm able to use it with an intel board that supports XMP?
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June 4, 2013 1:23:18 PM

XMP allows for quick memory settings on XMP equipped equipment. It's kind of a one touch settings. You still can set it to the XMP settings on AMD systems just most of the time you need to manually adjust the settings instead of selecting XMP option in the bios.
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June 5, 2013 9:45:13 AM

Alright, so which of these values am i changing? I'm guessing based on just how the numbers are sequenced it's the 9,9,9,24, but would changing those values, and not all of the others create any issues? Wondering just how under-clocked all these numbers might be.

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June 5, 2013 3:13:58 PM

Thanks for the additional information.

According to Corsair, i want to change the three values to 8, as mentioned in this thread. They also suggested increading "Command Rate" to 2T, and increasing the voltage to 1.55v / 1.6v.

Can anyone here endorse this course of action? I'm not trying to overvolt / clock, i just want to run the ram at it's advertised speed.

There is also this Ai Profile option with the BIOS called D.O.C.P. Upon enabling this, i can select "Profile #0" which has the 1600mhz 8-8-8-24 timing listed, and it DOES seem to change the Command Rate to "2T", but it leaves the voltage.

I'm just very confused about this, currently.

I really appreciate the help thus far, though :love: ...
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June 5, 2013 3:22:13 PM

It will be fine the way i told you to change it ,you don't need to change voltage.

There is also this Ai Profile option with the BIOS called D.O.C.P. Upon enabling this, i can select "Profile #0" which has the 1600mhz 8-8-8-24 timing listed, and it DOES seem to change the Command Rate to "2T", but it leaves the voltage.

Ok this way to ^
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June 5, 2013 3:58:47 PM

THanks SR-71 Blackbird, you're ON this, man :) .

So, if i'm using D.O.C.P., will this overclock anything else? I'm using stock cooling on the CPU, and don't want to fry anything.

What happens if the RAM needs more voltage, but doesn't have access to it?
Are there many risks with increasing the voltages?
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June 5, 2013 4:02:19 PM

No , it just helps your ram run at it's rated speed.Overclocking ram will produce no noticeable results.
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June 6, 2013 4:52:07 PM

Called Cosair again, and a tier 2 tech at Asus...
I have been hearing / reading that AMD boards require or use more power for ram(?), and Corsair suggested adjusting voltages again (to 1.55/1.6.)

I'm not doubting any of the advice i've received here, i am just trying to understand WHY i'm doing something...

Can you please elaborate, SR-71 Blackbird, on why i DON'T need to change the voltage on the RAM?

I'm currently guessing that the ADVERTISED voltage rating was for an intel board(?), but i could be mistaken!

Cheers :) ...
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June 6, 2013 7:01:35 PM

Comparatively speaking AMD has weaker MCs (memory controllers) than do Intel CPUs, they are also primarily oriented towards 2 stick setups. So oft times AMD rigs will/may require additional DRAM to the sticks themselves (I normally start at + 0.05) and also to the CPU/NB voltage (which controls voltage to the MC)
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June 6, 2013 7:13:54 PM

Tradesman1 said:
Comparatively speaking AMD has weaker MCs (memory controllers) than do Intel CPUs, they are also primarily oriented towards 2 stick setups. So oft times AMD rigs will/may require additional DRAM to the sticks themselves (I normally start at + 0.05) and also to the CPU/NB voltage (which controls voltage to the MC)


so if i'm increasing the voltage to the ram to 1.6v from 1.5v, i also want to be adjusting the CPU/NB voltage? @_@.

By approximately what amount? This is an area which i confess to be ignorant in, even after years of PC building.
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June 6, 2013 7:14:59 PM

The best way to know if your going to need to increase the voltage (but there should be no need for having a higher voltage then what it says on the stick itself) is to run Memtest86+ for a few hours to test the ram and see if it will error. If it errors up the voltage a slight bit. If not then you leave it be.

If the ram requires a higher voltage than specified on the sticks then the ram should be replaced. Since you are running everything at stock settings the chips should run at stock voltage. The only reason to over-volt a set of ram is to get a bit more of an Overclock out of it.
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June 6, 2013 7:19:41 PM

bgunner said:
The best way to know if your going to need to increase the voltage (but there should be no need for having a higher voltage then what it says on the stick itself) is to run Memtest86+ for a few hours to test the ram and see if it will error. If it errors up the voltage a slight bit. If not then you leave it be.

If the ram requires a higher voltage than specified on the sticks then the ram should be replaced. Since you are running everything at stock settings the chips should run at stock voltage. The only reason to over-volt a set of ram is to get a bit more of an Overclock out of it.


Is there a chance the rated voltage was only tested for intel boards / XMP profiles?
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June 6, 2013 7:30:21 PM

No it is a standard setting for all boards and chip types. Intel vs. AMD has nothing to do with it. The ram sticks are rated to run at that voltage at stock setting on either CPU.
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June 6, 2013 9:33:49 PM

While yes DRAM has a standard voltage, Individual CPUs can vary quite a bit as far as what and how they handle DRAM, especially AMD CPUs,with basically anything from 1600 on up, it's not that unusual to have to raise DRAM voltage. Big thing is to get it stable, then can always experiment with decreasing the DRAM and or CPU/NB voltage while maintaining stability
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!