Teamgroup 2600 c10 2 x 4gb issues

MrPils

MrPils

MrPils

Associate
Joined
29 Jun 2009
Posts
549
Hi, hoping for some help with my difficulties with this kit.

System specs are below:

i7 3770k (custom water cooled)
Teamgroup 2600mhz c10 2 x 4gb
Asus M5F
MSI Lightning 6970
SoundBlaster Z
Seasonic 750w

I am unable to get the kit prime blend stable (7000mb allocated 24 hour test) at stock timings and volts. I have managed to get close, but not quite stable.

The defaults on this kit are 10-12-12-31 @ 2600mhz 1.65v. According to the Teamgroup and the OCUK site its supposed to be 1T command rate, however XMP is programmed at 2T. Changing this manually to 1T made no difference to stability though, a pass is still a pass and a fail is still a fail.

I've done loads of testing over the last 3 or 4 weeks as I've not had a memory kit capable of even 2400mhz before, so had to ensure my IMC can cope. I actually seem to have lucked out here as it goes right up to 2666mhz stable using default volts for vccsa and vccio. I have however tested the failing prime configs below using 1.1v vccsa and 1.2vccio and it made no difference. All testing below is at stock cpu speed.


Test results are below:

XMP / Auto : 2600mhz 10-12-12-31-2T 1.65v/1.2vccsa/1.25vccio Fails within 30 mins
2400mhz 9-11-11-28-1T 1.65v - Fails within 10-30 mins
2400mhz 10-12-12-31-1T 1.62v - Pass 24 hours
2600mhz 11-13-13-35-1T 1.65v - Pass 24 hours
2600mhz 10-12-12-31-1T 1.65v - Fails within 5-15 mins
2666mhz 11-13-13-35-1T 1.65v - Pass 24 hours
2800mhz 11-14-14-35-2T 1.65v - Boots to windows, not stable in the least.

I freely admit that i'm in uncharted ground here...I've had no experience of tweaking memory above 2200mhz before, so its possible there's a key timing or setting hidden somewhere in bios that I'm unaware of (Dram CLK period from 5 to 7 was the key for stability at 2600/2666 for example, it took me a good few days to figure that out!). To try and remove this possibility I have tested using spd, xmp, board auto settings and using the Samsung and TridentX presets (TridentX particularly sets very lax subtimings including LB14). I have found stable subs using the reduced primary timings listed as stable above though, so i'm as confident as I can be that i've done as much as I can to mitigate this possibility.


I've put in a webnote a few minutes ago to see what the OCUK techs can suggest, but thought I'd open this to the floor while I wait for a reply :).

Many Thanks!
 
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Even though I can run 2600 and 2666 stable at default IMC volts? Primary timings are dependant on the memory modules aren't they rather than the IMC? I mean I can boot to windows at 2800mhz 11-14-14-35-2T (though its not stable) at near default IMC voltage (0.985vccsa/1.0875vccio).

I was fully prepared to face my cpu not going to 2600mhz...my true target was 2400mhz with decent timings with the possibility of more MHz given the kit. However I can't hit decent timings at 2400mhz either. That in combination with being able to get to windows at 2800mhz is what's making me question the memory rather than my IMC.


Got a reply to the webnote...an RMA number, no advice for further testing just send it back :(. Its valid for 28 days so ill probably do a little more testing over the next few days just to be certain, so I'm still open to any suggestions on anything to try...

Cheers!
 
Have you tried tinkering with the transmitter and receiver slew? When I was overclocking my ram on a MVE I used this guide and it helped me out :).

By getting the right values for these slews I was able to boot beyond 2800mhz, when left on auto I couldn't get past 2666mhz. It's worth a try if you haven't tried it already.
 
No I haven't actually. Everything in that section is on auto, including the swizzle stuff as well.

Skews and Slews have always confused me tbh, never quite sure where to start! I was under the impression that messing with those was more for max validations than enhancing 24/7 stability? From what I understand these settings are dependant on individual systems too, there's no "good fit" setting for everyone's pc.

I haven't tried single stick testing either, but then that wouldn't necessarily tell me anything. I'm pretty close to stable in dual channel, so I wouldn't be too shocked if single channel everything is fine.

I guess it all boils down to whether primary timings are IMC dependant or not. If they are IMC dependant then I could have a weird IMC that cant run tight timings but can do big mhz. If as I suspect primaries are memory module dependant its almost certainly the kit. Its a shame there's so little solid info out there on exactly how to tell the difference between IMC and memory module instability. Its all witchcraft and miracles! :p

Teamgroup themselves suggested I test at 9-11-11-28-1T, and when this failed they suggested I contact ocuk for further testing/rma.
 
Some cpu's can drive higher raw speed, some tighter timings, some can do both. It should just run fine with XMP enabled however.

Probably best to just RMA, save yourself the frustration :)
 
Yeah frustration is the key word at the moment...tantalisingly close at times but just not quite there!

I'll see if I can see any change in stability from playing with the skews. MCH duty sense is another I haven't touched either.

I'm glad to hear you would expect XMP to work as long as the IMC can achieve the memory ratio, that was my impression as well. Thx for that, its set my mind at ease a little :). Really don't want to get hit for double postage and a £12.50 fee because I missed something!
 
Is cross posting ok? I don't want to get my hand smacked :)

Edit: Posted in the other forum, thanks for the recommendation.
 
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im also having some interesting times getting this ram stable. with my haswell..

thanks for the table of stability on the first post, its helping a lot ;)
 
Guys I will help no problem. Post up the settings the system is setting for auto values at DDR2600 and 2666 I take it your trying to get it stable at 2666. Also James have you tried Shammys 2666 1.65v Samsung IC profile in the profiles of within DRAM settings. I have never tried this profile but it could be a good starting point.

When testing the RAM its self you need stock CPU speed and mem test not Prime.
 
hey man,

ive been trying to figure out if its not stable because the memory itself is faulty. or maybe my motherboard..

as it stands its stock, everything, xmp profile active, voltages as follows:

dram 1.671 (llc from 1.65)
IOD 1.16
IOA 1.154
SA 1.16.

all auto.
timings:
10/12/12/31/1T
7/193/7936/24/6/27/6/9
5/5/6/20/5/5/4/8/8/25/15/13/13/13/2/2

(from mem tweakit 2.00.01 - doesnt exactly correspond to bios)

tried the sammy 2666 @ 1.65 profile and no joy.

what is the highest volts that are safe for these chips?


cheers!
 
Safe about 1.75-1.8 24/7

At 2600 you stable?? Try mode 1 and 10-12-12-31-1T first. TREFI can be 11000 and DRAM CLK period 14.

I have these Dimms at OCUK so I can test when I am back in Thursday.
 
its weird. it was failing prime instantly. with me swapping sticks etc.

its now been running for 11 mins and so far ok, which is longer than its done so far
 
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