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Samsung 2x4Gb Low Voltage DDR3 1600 kit (OCing to 2400+) Discussion - Page 111

post #1101 of 1841
8/21/12 at 2:07am
Quote:
Originally Posted by stn0092 View Post

Where did you find that information? From my reading of the SB-E OC guide, VCCSA handles the System Agent/IMC and VTT handles the QPI which connects the I/O components you mentioned.
I'm not questioning your results from raising VTT; I just want to be safe and avoid damaging some expensive SSDs. smile.gif

Neither VCCSA, VCCIO, nor QPI/VTT touch anything but the CPU on the platforms in question.

Consumer LGA-1155 doesn't have a QPI bus at all and all QPI buses on consumer LGA-2011 chips are physically disabled.
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post #1102 of 1841
8/21/12 at 2:21am
My Samsungs needed 1.58v Vmem for 2133@9-10-10-28-1T Prime stable. I would say a good *starting point* is 2133@10-10-10-28-1T@1.5v instead, in case there are unrelated IMC or motherboard issues.

If you have a poor IMC, try increasing Vccsa/Vccio from 0.925/1.05 to 0.975/1.10. If you have a mobo that tries too hard to save power (e.g. P8Z77-V), set DRAM Power Phase to Extreme to exclude power delivery issues (especially if you've had Prime pass for 12h+, only to get a failure within 2minutes after a reboot).
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post #1103 of 1841
8/21/12 at 2:40am
Interesting info Blameless. Would you recommend raising either or both of them?

I got my info from the Asrock mobo Sandy/Ivy OCing thread:
Quote:
VTT Voltage (VCCIO): Auto
~Also goes by the name IMC, QPI / DRAM, and QPI / VTT.
~Controls the voltage sent to the Integrated Memory Controller (IMC) inside the CPU and the PCI-E Controller on the motherboard.
~This rarely will ever affect an overclock. Do not mess with this setting.
System Agent Voltage (VCCSA): Auto
~Controls the voltage sent to most anything not already mentioned.
~Do NOT ever change this.

The guide only says not to touch those voltages as the guide does not recommend OCing memory at all.

I'm going to stick with my RAM settings for now, but I will play around with VCCSA and see if I can get 2133 to work.
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post #1104 of 1841
8/21/12 at 3:09am
Quote:
Originally Posted by ti20n View Post

My Samsungs needed 1.58v Vmem for 2133@9-10-10-28-1T Prime stable. I would say a good *starting point* is 2133@10-10-10-28-1T@1.5v instead, in case there are unrelated IMC or motherboard issues.
If you have a poor IMC, try increasing Vccsa/Vccio from 0.925/1.05 to 0.975/1.10. If you have a mobo that tries too hard to save power (e.g. P8Z77-V), set DRAM Power Phase to Extreme to exclude power delivery issues (especially if you've had Prime pass for 12h+, only to get a failure within 2minutes after a reboot).

That's the exact board I got and cause i'm a rather big hobby overclocker I got pretty much everything in the DIGI+ settings on Extreme / Max settings.

I'll play around with it for a bit but at say, 2133 9-10-11-24-1T Prime / BF3 crashes within 5 minutes of running... 9-10-10 won't even boot frown.gif
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post #1105 of 1841
8/21/12 at 3:10am
Distinction between VCCSA and VCCIO is a bit fuzzy as pretty much everything influenced by VCCIO is technically part of the System Agent as well. Both likely have some impact on the integrated memory and PCI-E controllers.

http://software.intel.com/sites/billboard/tutorial/intel-core-processor-architecture

http://www.intel.com/content/dam/www/public/us/en/documents/datasheets/3rd-gen-core-desktop-vol-1-datasheet.pdf

I'd say they are both worth experimenting with, but you virtually never want to use more voltage than you actually need, long term.

Regarding your quote...Sandy and Ivy don't normally have PCI-E controllers on the motherboard, that's part of the CPU. Even the slots connected to the PCH should be bridged to the CPU's DMI bus (which is essentially a PCI-E 4x link).
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post #1106 of 1841
8/21/12 at 4:09am
I got a pair of these at 2000MHz 9-10-10-21 1T @ 1.43v stable (15 hours P95 blend).
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post #1107 of 1841
8/21/12 at 9:20am
Running mine right now at 2x4GB @ 2200 9-10-10-24-1T, with the secondary and tetriary timings tightened up at 1.56V. Still testing with Prime95. Might have to go a bit higher on the voltage. Chaning VCCIO and VCCSA did nothing for stability for me. Only cpu voltage and ram voltage makes a difference right now.
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post #1108 of 1841
8/21/12 at 9:25am
Quote:
Originally Posted by MaxT View Post

Running mine right now at 2x4GB @ 2200 9-10-10-24-1T, with the secondary and tetriary timings tightened up at 1.56V. Still testing with Prime95. Might have to go a bit higher on the voltage. Chaning VCCIO and VCCSA did nothing for stability for me. Only cpu voltage and ram voltage makes a difference right now.

Ivy bridge has a stellar IMC, and doesn't really need extra volts for speeds below 2400mhz really...If your ram is capable of the clocks/timings the imc will pretty much do its job.
I bet you can feed them more volts and go higher, but I'm not sure which is the safest 24/7 voltage for these sticks.
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post #1109 of 1841
8/21/12 at 9:34am
Quote:
Originally Posted by ivanlabrie View Post

Ivy bridge has a stellar IMC, and doesn't really need extra volts for speeds below 2400mhz really...If your ram is capable of the clocks/timings the imc will pretty much do its job.
I bet you can feed them more volts and go higher, but I'm not sure which is the safest 24/7 voltage for these sticks.

I want to stay with a good mix of MHz vs tighter timigns. 2200 9-10-10-24-1T is what I would like to get full stable 24/7. Every guide I read recommended setting VCCIO and VCCSA. Took me 2 weeks of testing to find out they do nothing for my overclock tongue.gif. Now I am just trying to get the tight timings stable at anything under 1.6v. The chips on these sticks can take much more, it's the PCB i am worried about. Either way 1.6 is my limit, at which point I will start relaxing the secondary timings.

Running with this right now:

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post #1110 of 1841
8/21/12 at 9:41am
Hi guys quick question,

I'm having a difficult time OC'ing this ram anything past 1866 mhz. I've tried timings/voltages that many people are saying they've gotten but the system won't POST.
Here is my setup

i5-3570k
Gigabyte z77x-ud3h
16gb of this samsung ram - currently @ 1600 mhz 8-8-8-24 1t / 1.5v

Now I am using intel's turbo boost to OC the the processor to 4.6 ghz. Could this be the reason I'm not posting at higher frequency for the ram? Should I try doing the manual OC method for the CPU? I'm new to this turbo boost thing
Edited by slicetank - 8/21/12 at 9:46am
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