What do ddr3 timings mean

What are all these other numbers? What do the abbreviations mean? Why is it all so complicated!? Oh, and why do I care? This is the delay time in which the memory a receives a command from the processor, to the point where it b sends data back to the processor. Along with different timings, there is an attribute called Clock Cycle Time. This is a measurement reflective of how quickly the memory can be ready for a new set of commands.

As the chart below illustrates, this effectively means the True Latency real speed is much faster. If you would like to know more about speed vs latency, check out this in-depth article. In most cases you shouldn't worry about your memory timings. If you have any further questions be sure to reach out to Crucial support. All rights reserved. The first number, xxx, indicates the maximum clock speed that the memory chips support. It is important to note that this is not the real clock speed of the memory.

The first classification, DDRxxx, is the standard used to classify memory chips, while the second classification, PCyyyy, is the standard used to classify memory modules. Pay attention to the RAM timings and voltage 1. If the memory module is installed on a system where the memory bus is running at a lower clock rate, the maximum transfer rate the memory module will achieve will be lower than its theoretical maximum transfer rate. Actually, this is a very common misjudgment.

This is the maximum clock rate they support, not the clock rate at which they will be running. So, why would someone buy these modules?

Someone would buy them for overclocking. Since the manufacturer guarantees that these modules will run up to 2, MHz, you know that you can raise the memory bus clock up to 1, MHz to achieve a higher performance with your system. However, your motherboard must support this kind of overclocking read our tutorial on memory overclocking for more details. Thus buying a memory module with a labeled clock rate higher than what your system supports is useless if you are not going to overclock your system.

For the advanced user, there is yet another characteristic: the temporization of the memory, a. Because of timings, two memory modules with the same theoretical maximum transfer rate can achieve different performance levels.

Why is this possible if both are running at the same clock rate? Timings measure the time the memory chip delays doing something internally. I'm assuming I might just need to change use a screw driver on the bios things to reset it at worse. Does it need to be something in relation to the Minimum RAS active time or something other timings?

But it won't let me do this. I don't know why I can't get it below 33T. OK - I have to ask if you are running both sets in the system or not. You should ALWAYS run identical sticks because even if the timing specs are the same between them you could have different IC's Internal chips between the two sets and each maker has their own specs for them.

Noted the specs between the sets you have are indeed different. The specs of your sticks and overall setup tells me about in CPU-Z is about the limit, perhaps - if your lucky with those regardless.

Although you're running a Thuban it's not too common to see a set get and that's with higher voltages to the sticks requiring better than stock cooling, looser timings and such, certainly not for everyday use. The board you have isn't that bad but it's not a top of the line clocker either, even my Crosshair V-Z can't really push a set to running my T chip - It's done it before but had to lean on it hard and will only do it with a select few sets of RAM I happen to have. Best thing I can suggest is keep it at MHz and simply tweak timings but as said before it's really a waste of time since you won't get much if any difference you'll be able to notice except with certain things like a run of Super PI as an example.

For gaming and just all around use you won't notice it at all. Tweaking secondary timings is useful for memory overclocking. However, since you have 2 different kits, it will be wiser to stick with the default for compatibility. Bones said:. Does anyone have any idea how to push the Row Cycle Time below That might help get performance.

But it has never gone below 33T or maybe 32T if lucky. Yes I'm running all 4 in the system. Should I take out the Viper 3 and see how it overclocks, or is there no real gain from going to mhz. The Mushkin enhanced are actually mhz PC modules.

I just never ran them at that speed because I didn't think I could safely get the board up. Although I have no idea what could be safely done for long term use. Can you run with the FSB at mhz safely on this board? BTW, I'm in ganged mode if it matters. To be more specific. The mushkins are populating Dimms 1 and 3. The partriot ram is in Dimms 2 and 4. If it does you can go from there but if not you'll have to settle for less RAM speed because the system woudn't be capable of it. Joined Sep 16, Messages 2, 2.

Honestly, with that ram you are just better off to find your max clock, and just leave it, don't worry about timings, you aren't going to knock em down enough to gain anything tangible. You aren't going to be able to drop the cas.

Speed them up to see if you can drop some latency and pick up a little bandwidth, and call it a day. You need enthusiast ram to do what you want to do..

I've got a few sets but I doubt I would part with them, and I'm pretty sure I'm not the only one that feels that way Nothing wrong with playing around though. They suck.

But I like the extra ram. And to be honest.. I can populate all four dims with BBSE on this board at 1T but outside of some benchmarks, cant see a difference between that and 2T.

Or even I bought some hyperx s that were complete shite. I did get them to run, but they wouldn't deviate from their timings at all, which were looser than sloppy seconds, probably terrible thirds, if I were to stoop that low..

Lol sold them a few hours later. The difference between 1T, 1T, and 1T is all in the benchmarks. But if I increase the speed of the ram what is it gaining over just normal speeds. How does that increase the bandwidth of the ram? I'm not understanding what part of the ram or system increases that. I'm still not sure where i need to be careful about that or how to tell if it will cause problems. Is it safe if i don't increase the voltage or does that still cause potential heat problems.

Is there a way to tell? I don't think the FSB chip has a heatsink unless it is in the cpu. I'm not really sure. Joined May 8, Messages 1, 0. Frequency also directly increases bandwidth.

Forcing one timing too low will make RAM unstable and you might increase others to regain it. Which of course decreases the perf.