2nd Information - RTL differences between two identical CMX6GX3M3A1333C9 kits

[lalittle]

I searched the web for this information, but I wasn't able to narrow in on the answers I was looking for.

 

I'm trying to find more information on what the significance of the "2nd Information" DRAM timings are given that I have two identical systems (P6X58D Premium with CMX6GX3M3A1333C9 kits), and this information is different on each system. One lists 1N-56-59-61, while the other is 1N-58-58-58. In other words, the Round Trip Latency is different for each set.

 

The reason I'm curious about this is because one of the systems is more of a "mission critical" system, so I'm wondering if it would make sense to use one or the other of these sets in that system.

 

Is it significant that the RTL numbers on all three channels matches on one of the sets, or that the other set has a lower number for channel A? The 1N-56-59-61 happened to end up in the "mission critical" system. Is there any reason to swap sets between the two systems? Even if it's a negligible amount, will the 1N-58-58-58 set be just slightly faster due to its lower overall average, or will the other set be slightly faster due to the faster channel A module? Or... will this make no difference what-so-ever.

 

Note that all the BIOS settings are set to "Auto" except for the DRAM frequency, which had to be manually set to 1333 for these modules. Both kits are the exact same revision number.

 

Thanks for any information on this,

 

Larry

[lalittle]

I asked Corsair tech support about this, and they didn't feel that these numbers mattered. That said, the difference in these numbers between the two kits obviously has "some" meaning (1N-56-59-61 vs 1N-58-58-58), so I still don't feel like I have a full grasp of the situation.

 

Please note that I'm not worried about any "problems" -- I'm simply curious if it makes sense to use one or the other kits for the more mission critical system.

 

I'd therefore still be interested in hearing any further feedback on this. So far, my searches have not turned up any answers to this question.

 

Thanks again,

 

Larry

[lalittle]

I'm still hoping for a bit of feedback on this, but in the mean time I just wanted to add that the numbers are different on subsequent boots -- i.e. it will be 1N-58-58-58, then on the next boot it will be 1N-56-58-59, then 1N-57-58-58, etc. Both systems do the same thing using either set of modules in either system, and the numbers are always very close (as in the example above.)

 

Just out of curiosity, is this a motherboard feature that is causing this (P6X58D Premium)? I always thought that the motherboard set these numbers based information stored on the modules, but obviously something else is happening such that the settings change just a tiny bit from boot to boot. It seems like the motherboard "tests" the RAM on every boot and makes changes based on the test results.

 

Thanks again for any feedback on this,

 

Larry

[Wired]

Yep, IIRC those are memory controller settings.

[lalittle]

Yep, IIRC those are memory controller settings.

 

So does the controller "set" these speeds every time it boots, and then leave it at these timings until the next boot, or will these timings change from one moment to the next even during the same boot?

 

In my testing, I've found that one kit ends up with just slightly faster (lower) numbers regardless of which system I put it in. Does this mean that one kit is just slightly faster than the other due to variations from kit to kit?

 

Thanks for the information,

 

Larry