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Stability gone on my 3770K

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#26
That sounds pretty stupid to be honest. Similar to those "regtweaks" which in fact don't do anything but have been circulating the internets for ten years.
Tell that to the people bricking their boards for not following that to the letter. Was a big deal briefly on [H] when the Asus rep mistyped the instructions (left out the letting it enter windows part) and people were left with paperweights.
 
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#27
Overclock That RAM!

The big question:
Is going from 1866@9-10-9-27 1.5V to 2133@9-13-13-36 1.65V worth the pretty big jump in voltage?
Yes, it's worth it. I overclocked some cheap ($40 for 2x4GB) 1600 HyperX sticks to 1866 with just a small slackening of timings (it was already 1.65v at 1600!), and it appreciably increased my throughput while decreasing my latency.
As for the 1.65v question - the consensus seems to be that it doesn't hurt anything, even over long periods of time. Many crazy overclockers go even higher, up to 1.8v, but it's definitely not recommended - the processor will fry when the RAM goes.
I am currently running Kingston HyperX Beast 2400 MHz at 11-13-13-30-2T, and my throughput (copy) is around 26,700 MB/s and latency is 35.0 ns. It's not the greatest kit in the world, because if you bump any of the settings even a little, it becomes unstable and won't pass Prime95 or IBT. It will, however, run perfectly stable on XMP profiles and by manually setting the (stock) timings.
If you want more headroom from 2400 binned RAM, you have to pay more than the $65 I paid for the Beast 2400 kit, like maybe get some Corsair Dominator Platinum 2666 - I see NewEgg has a 2x4GB kit for $170. I don't see any 2400, but the 2133 version is only $130 and it's 9-11-10-30 @ 1.5v, so I'm sure it will hit 2400 easily at 1.65v.
To test my new settings, I always use the memory tool in AIDA64 Extreme, it only takes a few seconds and will reflect even the smallest changes.
 
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#28
Cheers.
Are there any general guidelines for setting the four basic timings? Years ago I believe they said tRAS should be the sum of the others, which I found weird, but whatever... Not sure if it still applies - if it ever was true at all.
 

cadaveca

My name is Dave
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#29
Cheers.
Are there any general guidelines for setting the four basic timings? Years ago I believe they said tRAS should be the sum of the others, which I found weird, but whatever... Not sure if it still applies - if it ever was true at all.
It was true, for sure. Still kind of works for JEDEC settings too. JEDEC settings definitely use a formula or some sort.

However, when clocking, each IC behaves a bit differently, so there are no real "general" rules any more. A perfect example of this is what is offered by the ASUS Maximus V Extreme. In the BIOS on that board(and most current ROG boards today), you'll find many different memory profiles, each of which contains widely different settings for each IC type, and then for the type of clocking you want to do, whether max frequency, or tight timings.

See here:





Review here:


http://www.techpowerup.com/reviews/ASUS/Maximus_V_Extreme/8.html


BTW, none of these profiles really work for what I want to do, either. :p.:roll:
 
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#30
Hmm, still testing. Still not content with the stability.

I feel I don't understand how messing around with VCORE works.
Is there any difference between auto and normal with no offset? Do they differ in any way in this situation?
What does negative offset affect and how is it with positive one? I have a feeling negative offset doesn't affect VCORE under load at all. In fact I suspect negative offset doesn't do jack shit :D
Positive offset seems to affect both idle and load, though.
It's a bit of a mystery.
 
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#31
On my board (Asus P8Z77-V), leaving vcore on auto will result in way-too-high volts and temps, so I start with a fairly high (.060) positive offset, check temps/voltages/stability under load with IBT and Prime95, and if it passes, go into BIOS and reduce the offset to +.050, test again, repeat as necessary until it fails a stress test, then go back up in .005 increments until stable and at acceptable temps. This is for an i5-3570K overclocked to 4.3 GHz using the multiplier @ 43x and cooled by H100/4 fans. If I try 4.4 GHz, my temps go over 70c at stable vcore setting (only on IBT or Prime95, stays in the 50s when gaming or trans-coding audio/video). I prefer a cool CPU with a long life so for now it stays at 4.3 GHz.