Samsung Green RAM 16gb Overclock Improvements

smelly_legend

smelly_legend

smelly_legend

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Hi 8Pack,

I'm currently running the specs in my sig and my RAM n these settings:



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Now, as an overclocking enthusiast (as well as humble student) I am wondering what sorts of timings and frequency I can push for the RAM on my current chip? Also, how would I go about this? I understand that because I have a limit to the 3820's IMC as well as 16gb populated in 4 dims I might be pushing it a bit - but I guess I'm in the right place to be asking these sorts of questions ;)

If you need any more information on my BIOS settings such VCCSA, PPL and VTT (as well as any other settings) I will be more than happy to fetch them for you!
 
The 3820 IMC in general is as good as any other SB-E so should be good for around 2400mhz + usually around 2500. Great board that one!!!

First lets look at frequency. Up the memory multiplier to give you 2333mhz set DRAM voltage 1.65v, VCCSA 1.15, VTT 1.15. Timings 10-12-12-31 2Tand Rampage Tweak Mode 1. Then start pushing the blk at these timings and see how far you get it stable. No boot at 67,62 etc means memory needs tuning. No boot at 01 means IMC is incapable.

Once you have done this we can look at timings.
 
First things first - many thanks for yer help.

Yeah, the mobo is a great one. I wanted a decent board so I could hell for leather on the overclocks when I had read up on them a bit more. Maybe a board for Ivybridge-E chip when I need one.

I'm Prime testing right now, I followed all your advice and also lower the multiplier by one to counter my cpu frequency going up and I have also had to bump the Vcore a tad to get it stable. Once I'm done with this prime test, I'll bang up a image to show where I am at.


Right now, it looks like a can squeeze:

BLK: 128.5
RAM: 2398Mhz
CPU Multiplier: 35
CPU Vcore: BIOS - 1.285 / CPU-Z 1.272
CPU Freq: 4497.5
RAM Primary Timings: As you stated above
Other settings: As you mentioned above.



Almost 2400Mhz on this Samsung RAM. Impressive.

So, where would I go in terms of timings?
 
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TRAS loves to be low on this RAM. 21 is a solid sweet spot up to 2400MHz that's for sure.

10,11,11,21, 1T and TRFC down to 114 for starters, should be easy to obtain.
 
I've also noticed that on CPU-Z it reports that my core voltage goes up to 1.288 when my cpu is idle - confused about that - lol

edit; Thanks Rossi, i'll give that a try
 
smelly_legend said:
I've also noticed that on CPU-Z it reports that my core voltage goes up to 1.288 when my cpu is idle - confused about that - lol

edit; Thanks Rossi, i'll give that a try
Click to expand...

It's nothing to worry about. With load on the CPU the voltage will droop down slightly. LLC (Load Line Calibration) counterbalances this if you need to due to instability, but generally ASUS boards are really good with vdroop.
 
Here are your tuning options first try going cas 9. Some will some wont. Then do as Rossi suggests. Although you may need TRAS 25 for overall stability. Following that tune the seconds like this TRFC first set 121. This may come down but get the other second in first. So go 5,121,auto,12,6,26,6,7 Moving down the seconds in bios. Then try go 114 or 107 on TRFC.
 

Ok, I have noticed something. There is no Minimal Pulse Width tCKE setting in my BIOS, yet it is in memtweakit. I had noticed this back when I first started tinkering with the computer but I thought nothing of it as I wasn't really tinkering with the 2nd timings. It has never appeared in any of the BIOS firmware updates either. Therefore, when trying to input the values to the BIOS, I have one left spare (on top of DRAM FOUR ACT WIN Time not wanting the value = 6 and defaulting to 15)

Oh and CAS 9 doesn't boot.

Please let me know of my noob failings!

Ta!

edit: Rossi : After some reading on Vdroop I understand what you are referring to - thanks man!

edi: Removed that tRAS comment -even I'm surprised how noob that was.
 
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Down your bios secondarys go:

5,121,12,6,26,6,7. tCKE is set on this board by Auto and Rampage Tweak. Mode 1 is compatability and stab. Mode 2 is perf.
 
Ok,

so the values are set, but I was getting BSOD 1A on prime, sometimes freezing on the windows splash screen, when I retry to boot.

I upped the Vcore to 1.315 and my multiplier back to 36 and now it boots in to windows. However, when I run prime the workers fail with either a fatal error or an illigal sumout. Any advice?
 



[URL=http://imageshack.us/photo/my-images/685/46556962.png/]

Ok, I've had a tinker with the settings you suggested. The only ones I can't get down are:

DRAM WRITE Recovery Time (14 instead of 12)

and

tRP .

I did have a tinker with the VCCSA/RAM voltage, however, I never really tinkered with the VCCSA Digi power options as in your guide you mentioned that it would add to the CPU degradation. I'm pretty stoked about these settings so far. I'm wondering, now, if I'm nearing the limit with timings or there are more tweaks?

Cheers.
 
vccsa is safe at 120% llc reg and 1.195v, so you have some play. Can you not go 10-11-11 then??? rest are looking good.
 
Ok what abput 10-12-12-21??? 1T

Now work on Latency Boundary setting. Start at 11 and work down. The lower the higher the perf.
 
Memtest is essential initially TBH. Then Prime Blend.

I loop tests two and five as RAM 99% of the time will fail on these.
 
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