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Latency Boundary tweaking on an ASUS MVF

post #1 of 9
Thread Starter 
Hi folks, I realize that there may not be oodles of increased performance to gain from tweaking my RAM with Ivy Bridge. But I am fascinated by the effects that I have seen tweaking the Latency Boundary - a setting which is hardly ever mentioned. My experience has been that lowering this setting from what I believe to be my board's default of 7 to 5 reaps by far the greatest bench score boost of any of the tweaks I have tried with my RAM. Lowering any/all of the primary timings and/or the Command Rate does almost nothing compared to the Latency Boundary set to 5. I have never seen a "secondary" setting do this before, and I'm just wondering how I can improve my stability with a LB of 5. Do any of the voltages have a more direct impact than the others? Or can I improve my chances at running a Latency Boundary of 5 by loosening any particular timings? I know that I can run at LB5 if I lower my CPU OC, but that would defeat the purpose. I'm grateful for any advice, or direction to pertinent material that anyone can provide. Thanks!
post #2 of 9
can you present your ram spec first and make your question more specific pls?
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post #3 of 9
Thread Starter 
Absolutely, should have given some specs sorry. I have a 16 GB set of G. Skill Trident X 2666 running stock right now in an ASUS MVF with an i7 3770K @ 5GHz w/ 1.42v. As I mentioned, I have twiddled with tightening all of the primary timings 10-12-11-31 CR1, (which these sticks are able to handle) but saw very little improvement in benches. Then I put the Latency Boundary at 5 and they just took off in AIDA64 Extreme.
post #4 of 9
Thread Starter 
My hope is that someone can give me some clues about which voltages, or settings might help to allow me to run at LB 5, or worst case 6. So far I cannot get my system stable with those settings. I mean, I will make it through a couple hours of gaming, but I cant get PRIME95 stable and eventually I bluescreen doing everyday stuff.
post #5 of 9
try higher frequency instead of lower timing, that is more important in recent days
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post #6 of 9
2666 is really quite good, especially with the higher binned timings from a lower speed binned kit. All of my TridentxX 2400 9-11-11-31 1T is able to hit at a minimum 2666, but they vary in how tight they can run tertiary timings.

I would be sure to optimize your IMC/VTT voltages, and you should be able to get even more from the memory if you're willing togo up to 1.75v on the DIMMs (have run higher for months with zero issues).

I would first try to get your tertiary timings as tight as is absolutely possible at your current speed, and slowly work up from there. 26xx is quite fast, and it would be better to have a stable and optimized 2666 10-12-12 kit than a haphazard 2800 13-14-14 kit.

Also, if you are not already, try and get then to run a command rate of 1T/1N. It's worth quite a bit as far as any single timing is concerned, because it effectively tightens ALL of the timings by one.
   
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LG/Hitachi Slim DVD-R/W Custom MB-Backside VRM-sinks (Copper) 3x NZXT RF-FX140LB 1-2krpm 98.3CFM Case Fans 2x Corsair SP120-PE Case Fans 
CoolingCoolingCoolingCooling
Heatkiller GTX680 "Hole Edition" Block + Backplate XSPC Single-Bay Res (Single 5.25 bay) EK Multioption Res X2 - Advanced 150 DD "Fill-Port Res" + Fill-Port Fitting (Red) 
CoolingCoolingCoolingCooling
2x MCP35X + Heatsinks/80x15mm Fan XSPC EX420 Alphacool NeXXos UT60 240 6x Bgears Blasters 140mm 1800rpm Fans 
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post #7 of 9
i would like to suggest op to benchmark 2400cl9 and 2933cl12 to see which one is much better
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post #8 of 9
Thread Starter 
Great suggestions guys, thank you! I shall give them a shot and report the results. I have no problem running at 1.75 VDIMM, and i'' bump the others as well. Before I got this current Kit I was using a mixed batch of two Dom Platinums 2666 and two RipjawZs 2400 that I was lucky enough to get to play well together. I could only manage 2400 stable with tightened timings, but it took 1.75v to do it. That is when I first noticed that Latency Boundary offered far greater benefits when lowered that Command Rate and all the Primary Timings put together. I would love to talk to one of the Intel engineers who helped design the IB IMC so I could ask him why LB carries so much weight. Thanks again for the help
post #9 of 9
Thread Starter 
So I figured I'd report back on my progress. It seems that the reason I couldn't run with a Latency Boundary of 5 was because 2666 was just too much for my MC. At least, it seems that this was the problem. I set my RAM at 2600 and I have been running with LB of 5 for several days, including several hours of stress testing. My bench scores are a little bit lower in AIDA64E Mem tests but not much. 35K Read 37K Write 38K Copy. So I'm satisfied. Well, maybe not satisfied. Now I'm gonna see how low I can set the other Tertiary Timing which carries a lot of weight. Thanks again for the help folks!
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