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  #1  
Old 08-27-2016, 06:59 AM
LRADIKAL LRADIKAL is offline
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Default F3-2133C10D-16GXM, Biostar TZ68A+ with intel 2550K

Hello! Need some help with a memory kit on an older board. This is a similar configuration to a previous post here: http://www.gskill.us/forum/showthread.php?p=73949

Too bad I didn't look this up before I bought the kit or I would have realized that I probably should have gotten 1866 memory with faster timings.

As discussed in the other thread, the RFC timing only goes up to 255 on this motherboard which seems to disallow 2133 speeds at all.

Currently I'm running 2x8GB at 1866 9-10-10-10-24 1T. I am able to boot at 1866 8-10-10-10-24 1T, pass a mem test, but am unstable in real world use. As for the rest of the timings I'm using what the gentlemen in the previously posted thread used for his memory on the same board.

The upgrade was inspired by this article: http://www.eurogamer.net/articles/di...-core-i5-2500k
My previous memory was 4x4GB of F3-12800CL9D-8GBXL at 1600 9-9-9-9-24 2T so I'm not getting too much of an improvement here.

There's no data I can find that reccomends timings for this memory at speeds between SPD and XMP. My main question is what settings might I tighten to get a little more of a delta between my old kit and my new, or should I just forget about it?

Thanks!
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Old 08-27-2016, 08:24 PM
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There is no universal correct settings for any kit at a given memory ratio. While for some kits it is possible to make educated guesses based on their specs and the ICs possibly used on them, the actual scaling can still vary.

So your 9-10-10-24 1T setting did pass stability testing?

Once you found a stable setting as a starting point, you could try to tighten the timings up one after another. But the performance gains won't be huge and it can take a lot of time you are not used to tinkering with memory settings. Other than that when tightening timings keep in mind that you might have to raise memory voltage at some point to re-stabilise your system.
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Old 08-28-2016, 06:02 AM
LRADIKAL LRADIKAL is offline
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Thanks for the reply.

In fact I've already begun tightening up timings. I'm now at 9-10-9-24 and pushed my tRFC down to 220. I'm perfectly willing to up the voltage a bit as well. In hopes of doing less straight up trial and error, are any of the timings I'm at (I'm aligned with the other thread's results except for tFAW) particularly conservative or highly influential to speed?

I guess this topic is also a bit of a whine fest, I should have gotten 1866 memory with better timings, since it seems like this kit is more about mhz than timings. I see there are 8-8-8-24 kits out there at 1866.

I am getting a chance to go in depth a bit more on how memory works though, which is nice. XMP always did the job for me and I haven't worried about it in the past.

I'm not sure if this is an interesting result or not, but check this out.

Code:
4x Core i5-2550K  	4500 MHz  	Z68 Ext.  	Dual DDR3-1866  	9-10-9-24 CR1  	26624 MB/s READ
4x Core i5-2550K  	4500 MHz  	Z68 Ext.  	Dual DDR3-1866  	9-10-9-24 CR1  	28450 MB/s WRITE
4x Core i5-2550K  	4500 MHz  	Z68 Ext.  	Dual DDR3-1866  	9-10-9-24 CR1  	26136 MB/s COPY
   Core i5-2550K  	4500 MHz  	Z68 Ext.  	Dual DDR3-1866  	9-10-9-24 CR1  	52.6 ns
I'm not sure how important these Aida64 numbers are, but my latency tops the benchmark list while the memory speed seems to be more along expected lines. Does this mean anything?

I'm also tempted to bite the bullet and install my old ram and do some more benchmarking out of curiosity.

Last edited by LRADIKAL; 08-28-2016 at 07:42 AM.
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Old 08-28-2016, 07:31 AM
Radman3d Radman3d is offline
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I solved my problem of running at 2133 a while back, please see pics for settings.
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Old 08-28-2016, 08:00 AM
LRADIKAL LRADIKAL is offline
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Hmm.. Just tried your settings. No joy, can't even get it to post at 2133. It'll power cycle itself a few times, then drop the bios down to defaults. Silicon lottery I guess. I'll probably just try to attack timings one at a time and see how I do.

Thanks for dropping in!
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Old 08-28-2016, 08:35 AM
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Quote:
Originally Posted by LRADIKAL View Post
In fact I've already begun tightening up timings. I'm now at 9-10-9-24 and pushed my tRFC down to 220. I'm perfectly willing to up the voltage a bit as well.
Raising Vdimm helps with tightening the primary timings. If you got 9-10-9-24 stable at 1.50V, you might get anything from 8-9-9 to 7-9-8 stable with 1.65V(+).

Quote:
Originally Posted by LRADIKAL View Post
I guess this topic is also a bit of a whine fest, I should have gotten 1866 memory with better timings, since it seems like this kit is more about mhz than timings. I see there are 8-8-8-24 kits out there at 1866.
Please consider that higher density memory usually doesn't do as well with tight timings compared to lower density kits. While there were 2x2GB kits with timings of 1866 7-8-7 available at some time, you won't find anything like that amongst 2x8GB kits.

Quote:
Originally Posted by LRADIKAL View Post
I'm not sure if this is an interesting result or not, but check this out.

Code:
4x Core i5-2550K  	4500 MHz  	Z68 Ext.  	Dual DDR3-1866  	9-10-9-24 CR1  	26624 MB/s READ
4x Core i5-2550K  	4500 MHz  	Z68 Ext.  	Dual DDR3-1866  	9-10-9-24 CR1  	28450 MB/s WRITE
4x Core i5-2550K  	4500 MHz  	Z68 Ext.  	Dual DDR3-1866  	9-10-9-24 CR1  	26136 MB/s COPY
   Core i5-2550K  	4500 MHz  	Z68 Ext.  	Dual DDR3-1866  	9-10-9-24 CR1  	52.6 ns
I'm not sure how important these Aida64 numbers are, but my latency tops the benchmark list while the memory speed seems to be more along expected lines. Does this mean anything?
R/W/C looks alright, latency is a bit high but i would have to see your full timings including the tertiaries to comment on how to improve that. Also if there was other software running while benching, that can also impact latency measurement.

Quote:
Originally Posted by LRADIKAL View Post
Hmm.. Just tried your settings. No joy, can't even get it to post at 2133. It'll power cycle itself a few times, then drop the bios down to defaults. Silicon lottery I guess. I'll probably just try to attack timings one at a time and see how I do.
Apart from the tRFC limit, i don't think it would be a memory problem, probably just weak memory training on the MB side. You might have to go full manual to hit DDR3-2133 including sub-timings and system voltages (VCCSA, VCCIO).

Last edited by emissary42; 08-28-2016 at 12:18 PM.
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Old 08-28-2016, 12:11 PM
Radman3d Radman3d is offline
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Quote:
Originally Posted by LRADIKAL View Post
Hmm.. Just tried your settings. No joy, can't even get it to post at 2133. It'll power cycle itself a few times, then drop the bios down to defaults. Silicon lottery I guess. I'll probably just try to attack timings one at a time and see how I do.

Thanks for dropping in!
Interesting that I too could not get it to work. Not sure what I did to get it to work, but I do know I did not give up and ended up with the settings I posted. I ran AIDA64 Trial version and the Read memory is 30801 MB/s, Write Memory is 32714 MB/s, Copy Memory is 30976 MB/s, Latency is 48.2 ns. Looks like if you can get it to run at 2133 you would get higher readings. Loosen the timings and keep trying...Good Luck.

Last edited by Radman3d; 08-28-2016 at 12:22 PM.
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Old 08-28-2016, 01:23 PM
LRADIKAL LRADIKAL is offline
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I ran the timings super high just to see if it would work at all. No luck whatsoever. I continue to creep up my 1866 timings. All my settings are contained in the link below.

WR and RFC do not go any higher than the settings shown.
http://imgur.com/a/sWgE7

I have my RAM voltage set to 1.65 but Aida64 is insisting that it is 1.5. "Open Hardware Monitor" is reporting an unammed voltage at 1.62 which could be my memory. I'm going to restart, drop the voltage and amend this post with the results.

edit: dropped RAM voltage down to 1.6 in BIOS. Open Hardware Monitor reports the same voltage at 1.57 which is the .03 less than the set target, which is consistent with the first reading.

Last edited by LRADIKAL; 08-28-2016 at 01:30 PM.
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Old 08-28-2016, 08:56 PM
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For tightening secondaries, try step by step lowering

tWR to 12, 10, 8
tWTR to 7, 6, 5, 4
tRRD to 4
tRTP to 7, 6, 5, 4
tFAW 26, 24, 22, 20

Save your stable settings to USB beforehand, if that's possible. Otherwise pen and paper will have to do. If you go too tight on the wrong timing, your system might no longer be able to POST and you would then have to clear CMOS.

HWInfo64 should be able to read any voltages and you can rename, hide, rearrange them in the sensor panel as well.
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Old 08-29-2016, 03:26 AM
LRADIKAL LRADIKAL is offline
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Thanks for the tips. I'll work on it throughout the week.

This motherboard has multiple configuration save slots on it, so it's pretty easy to deal with it not posting. I'll keep ya'll posted.
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