DDR3 2133 CL9 vs DDR4 2133 CL15

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While Skylake is rumored to support both, it will not be available until late-2015 assuming it does not slip into 2016 so there is no point of speaking of DDR4 for someone contemplating buying memory today unless it is for a Haswell-E build.

By the time Skylake launches, I would expect much cheaper and lower latency DDR4 DIMMs to be available.
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dgingeri

dgingeri

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clock for clock, DDR3 is faster due to lower latencies, but DDR4 can scale farther. In this case, DDR3-2133 is definitely going to give you better performance. It's not quite mainstream yet, and Haswell-E processors' memory controllers can't scale as far as the memory can just yet, so I don't consider DDR4 worth it quite yet, but it will be. You don't see any DDR3-3600 around, do you? DDR4 will reach up to 3600, and probably faster, within the next couple years.
 
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Titan
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While DDR3 is faster due to lower latency, it does not really matter since all current mainstream CPUs only support DDR3 and LGA2011-3 CPUs only support DDR4 so right now. So, once you picked your CPU, the choice of memory type you can use is made for you.
 
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dgingeri

dgingeri

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ah, but not necessarily. There is rumor that the next Intel mainstream CPU after Broadwell will support both memory standards. There may yet be a choice to make between them.
 
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Titan
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While Skylake is rumored to support both, it will not be available until late-2015 assuming it does not slip into 2016 so there is no point of speaking of DDR4 for someone contemplating buying memory today unless it is for a Haswell-E build.

By the time Skylake launches, I would expect much cheaper and lower latency DDR4 DIMMs to be available.
_____________

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IreMaster

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Thanks all, cool to see so much response for my first attempt for a question in an online place like this. Well, my biggest point was, to see what is the other's opinion, and thanks a lot, all of you have gave me quite some ideas. My dilemma is, is it worth it to invest money in Haswell-E now, or wait couple of years longer, when it will be much more clear where this tendency of new technologies will lead us. Yes, it is quite obvious that in the near future this innovative DDR4 will evolve, but, for now, it looks it is the clumsy predecessor of itself. Well, supposedly that near future is close enough, I am going to invest in the smallest possible amount of DDR4, as few years from now it will be the "troll" of DDR4... but definitely Haswell-E or Skylake, depending of external factors($) and my patience, of course.
 
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Titan
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Something better always come out a couple of years but if you always wait until then, something else will be about to come out and you will want to wait again, and again, and again. At some point, you have to draw the line and make up your mind about what you are going to buy or give up on buying altogether.

All first-generation products based on a new DRAM spec have been one or two steps back relative to the previous generation's high-end in terms of (non-official) memory latency and sometimes frequency. The DDR4 step back was expected long before it ever was announced, same goes for DDR3 and DDR2. This is a recurring pattern that goes all the way back to the first generations of synchronous single-data-rate memory about 20 years ago.
 
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