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Memory timings

Last response: in Overclocking
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November 23, 2011 10:33:14 PM

hello!
I've just built up a new rig
asrock extreme4 z68 gen3
gtx580asus
g.skill ripjaws X 1600 CL7 (7-8-7-24) 1.6v (F3-12800CL7D-8GBXH)
i7 2600K 4.6 oc
kingston hyperx ssd 120gb
(bios)so i tried xmp profile and it showed the memory kit right 7-8-7-24 and dram timings on auto but it says that it's 11-11-11-28 .. and i overcklocked cpu to 4.6 at 1.3V and tested with prime about 10 hrs...it was stable as a rock but.. then i tried to manually put the timings 7-8-7-24 and after a while(1 day) it started to give me random bsods? it crashes if i go in windows and spend like 2minutes.. but on xmp it runs perfectly fine but doesnt that mean that it runs on cas11 speed and that is like slow right?
should i leave it on xmp since the system is stable or what ? should timings rise up as i overclock cpu? g.skill kit says its CAS7 memory kit? should i try to tighten the timings and/or how much?

More about : memory timings

November 24, 2011 2:41:01 AM

your timings should be what the ram is rated for, unless the ram is overclockedd. Is your xmp profile pushing the frequency up? my g skill ram runs at 11-11-11-28 but that's because it runs at 2133mhz under xmp
November 24, 2011 7:18:08 AM

nope... my xmp doesn't push frequensy up .. it's still 1600 ..
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November 24, 2011 7:34:28 AM

and a memory sticks are in right place on motherboard , double checked..
November 24, 2011 9:04:09 PM

ditch xmp, manually set timings if your ram wont run at factory timings/speed rma it, run memtest to confirm its the ram causing bsods though. I know ram can play a part when overclocking, it might be that when your ram is at default your current overclock is no longer stable and might require a higher voltage or something.
November 24, 2011 10:07:30 PM

benikens said:
ditch xmp, manually set timings if your ram wont run at factory timings/speed rma it, run memtest to confirm its the ram causing bsods though. I know ram can play a part when overclocking, it might be that when your ram is at default your current overclock is no longer stable and might require a higher voltage or something.


tried the memtest and it bsods when its made 15% of progress (with 7-8-7-24)
a b } Memory
a b K Overclocking
November 24, 2011 10:54:18 PM

You can see your ram speed and timings in windows with cpuz. If you are stable with xmp but not manual, then use xmp. Xmp sets it to 7-8-7-24 1600 as that is what it is rated at. Ram oc is independent of cpu oc on sb.
November 24, 2011 11:13:23 PM

Quote:
You can see your ram speed and timings in windows with cpuz.


^+1 Have you checked your timings in cpu-z with xmp? it might be telling you one thing and doing another, i've seen other posts where xmp was doing strange things.

If cpu-z reads the timings CL11 when your using xmp and you can't run with manual settings then your ram has to be the issue imo.
November 25, 2011 9:22:06 AM

ok sorry.. I just figured out that I explained wrong... XMP profile on "auto" setting sets timings on cl11 automaticly the xmp profile 1.2 recognizes the ram as it should be.. cl7
but in a past few days i've been having random bsods on cl7 and yesterday i had bsod on cl11... so i ran a torture test on prime fft 1344 and 80% of ram (6500MB) for an 9hr 30min and it didnt show me any errors...
http://imageshack.us/f/339/torture787241600mhzi726.jpg/

this now has cl7 1600MHz on xmp profile 1.2

now bsods stopped ... i am so confused..
November 25, 2011 2:34:25 PM

Hi, i have been having similar problems on my system. I oc'd to 4.8 ghz 2500 k and runs stable at 1.40 Vcore in small FFT in P95 but when i do blend test i get a guaranteed BSOD after 1 to 2 minutes.

I guess you have to loosen the timings of the ram or up the voltage to remain stable RAM at higher overclock but i am not sure. I upped my ram voltage to 1.56 and my VTT to 1.08 but still get the same problems. I didn't touch the ram timings yet that is 9 9 9 24 1T for the moment and these are manufacturing specs. Anybody has an insight in this?

a b } Memory
a b K Overclocking
November 27, 2011 12:01:23 AM

I can only add my own experience. If you bought ram rated for 1600 at 7-8-7-24 timings then when you use the xmp profile that's the speed and timings you will/should get. When you start your overclocking up it slowly until you get the bsod during testing. When that happens you will need to loosing/raise the timings 1 up. For instance, 8-8-7-24. The 24 or cycle time, (tras) usually changes by itself - mine does. Mine is corsair 7-7-7-20 at 1600MHz. When I overclock it to 1800 like I have it currently I adjusted just the first timing to 8 and the others followed. The cycle time (tras) went from 20 to 26 so everything starts getting a little sloppy. You will also have to increase the voltage to it in order to maintain the speed. Mine went from 1.66v @ 1600 to 1.70v @ 1800. Just like the cpu, as you increase speed it takes more voltage to maintain it. I'm running off the x58 platform so my process might be a little different from yours. But as I increase the memory speed, (and I already have the cpu overclocked), I also have to make adjustments to the QPI/VTT. Also Make sure that your uncore clock ratio is twice whatever you memory speed is set to. Speed of memory is 1600 then the uncore clock ratio should be 3200, memory speed @ 1800 then the uncore clock ratio should be 3600 and so on. If these are out of sync then your overclock will fail everytime. When you do get a bsod, look to see the code. The most common is 0x50, which means RAM timings/Frequency to correct this you usually add DDR3 voltage or add QPI/VTT voltage, sometimes both.
November 27, 2011 12:40:51 AM

I were not trying to overclock ram memory.. only cpu was overclocked... but now the system has been running for almost 2 days without crashing showing timings as they should be and everything is stable : :love:  :love:  :bounce:  :bounce:  :sol:  :sol: 
!