cas latency or ram frequency

fredgreen1313 · Jun 9, 2013

is the frequency of the ram or the cas latency more important? i was thinking about getting this ram http://www.newegg.com/Product/Product.aspx?Item=N82E16820231589 for a asus maximus vi hero motherboard with a 4770k processor and i was wondering if that would be a good choice of ram.

Tradesman1 · Jun 9, 2013

To your choice Yes, and I highly recommend that set, I use the same exact sticks in 32GB set in my Ivy Bridge rig, and have tested/run them in a 16GB configuration...in fact, across the board, the Tridents have become my favorite model...Before deciding on them I tested them against similar sets also from GSkill (RJ Z) as well as Corsair and found the Tridents to have more OC headroom and that they underclock better also.

As far as CAS (CL) vs freq, it's neither. For best performance it's a combination of the two, an easy comparison method I've found that can used in most all instances is what I think of as the the single step method...find a set that looks good to you, might just be your opinion or may be a result of research, reviews, etc - and we'll use this set as an example the 16GB 2400/CL10....for comparison to other sets, make a list starting with set and go both up and down adding 1 level each of freq and CL to the next level up 2600 or 2666/CL11 and subtracting one level each when going down i.e. 2133/CL9 so you end up with something like this

3000/13
2800/12
2666/11
2400/10
2133/9
1866/8
1600/7
1333/6

With that list in hand as you go up the list, for each step up you'll see a small performance gain and a larger gain in bandwidth.....From here, I basically look at the client's budget to see what I can work with - as stated each step up gives you a performance increase, not humongous but a gain...then while looking, you should seek out a real gem here and there i.e. something off the list you made that's better in the same price range i.e. as an example if you decide on this 2400/10 set in your searching you might look at 2133 sets and find a 2133/8 set on sale or whatever opposed to the 2133/9 sets in the list....so that may be even better as most all decent sets of DRAM can be OCed at least one sets of steps you could take that gem at 2133/8 and more than likely OC it to 2400/9 which would be faster than the 2400/10 Tridents

Hope this is clear and it helps, if not let me know and I'll try and explain better

fredgreen1313 · Jun 9, 2013

Tradesman1 :

To your choice Yes, and I highly recommend that set, I use the same exact sticks in 32GB set in my Ivy Bridge rig, and have tested/run them in a 16GB configuration...in fact, across the board, the Tridents have become my favorite model...Before deciding on them I tested them against similar sets also from GSkill (RJ Z) as well as Corsair and found the Tridents to have more OC headroom and that they underclock better also.

As far as CAS (CL) vs freq, it's neither. For best performance it's a combination of the two, an easy comparison method I've found that can used in most all instances is what I think of as the the single step method...find a set that looks good to you, might just be your opinion or may be a result of research, reviews, etc - and we'll use this set as an example the 16GB 2400/CL10....for comparison to other sets, make a list starting with set and go both up and down adding 1 level each of freq and CL to the next level up 2600 or 2666/CL11 and subtracting one level each when going down i.e. 2133/CL9 so you end up with something like this

3000/13
2800/12
2666/11
2400/10
2133/9
1866/8
1600/7
1333/6

With that list in hand as you go up the list, for each step up you'll see a small performance gain and a larger gain in bandwidth.....From here, I basically look at the client's budget to see what I can work with - as stated each step up gives you a performance increase, not humongous but a gain...then while looking, you should seek out a real gem here and there i.e. something off the list you made that's better in the same price range i.e. as an example if you decide on this 2400/10 set in your searching you might look at 2133 sets and find a 2133/8 set on sale or whatever opposed to the 2133/9 sets in the list....so that may be even better as most all decent sets of DRAM can be OCed at least one sets of steps you could take that gem at 2133/8 and more than likely OC it to 2400/9 which would be faster than the 2400/10 Tridents

Hope this is clear and it helps, if not let me know and I'll try and explain better

but would i be better off with the 2400 ram with cas latency of 10 or the 1600 ram with cas latency of 7?

Tradesman1 · Jun 9, 2013

That's what often comes up and if falls into what's your budget, if within the budget I always go and suggest faster, not only do you get better performance, but as more and more developers see DRAM prices as low as they are, there is a trend towards adding more memory centric operations into apps, you also see it a little in the newer games as they come out. Another consideration is that the newer CPUs like faster DRAM and the manufacturers are factoring that in, so to a degree you are futureproofing your DRAM - the 4770K Haswell has just been released and already it's replacement Broadwell is in development as what will be it's successor (can't remember the name offhand) and they will all be increasing the capability of the CPU to use DRAM (will say however, think Broadwell will be the last to use DDR3, if in fact it does, may well be a combo of using either 3 or 4 as were the later production socket 775 mobo that could use either DDR2 or DDR3) , JEDEC is working on the specs for DDR4

gskill support · Jun 10, 2013

With the latest CPUs, a higher frequency will generally perform better than a lower latency. Especially if you OC the CPU frequency, throughput will be even greater due to the higher frequencies.

To answer your question specifically, DDR3-2400 CL10 would perform better, so you are better off with that. It will have the XMP profile for quick and easy set up in BIOS/EFI. Enable the XMP Profile and your system will be stable at full speed.

Thank you
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