RAM latency speeds (mhz)

16wongmc1 · Aug 9, 2016

At a cheaper price, is a downspeeded 2800mhz ram (to 2133mhz) due to the motherboard any different to a 2133mhz RAM

for reference these are the two RAM I am considering:
G.SKILL Ripjaws V Series F4-2800C17S-8GVR DDR4 2800MHz 8GB Ram (1x8GB) $40
Kingston HyperX Fury HX421C14FBK2/8 DDR4 2133MHz 8GB Kit (2x4GB) $44.5

This may be a stupid question and if it is, I apologize in advance

lucas_7_94 · Aug 9, 2016

Well, if you're going to put that ram on a locked CPU system, it will work @ 2133Mhz, no matters which one you select.

Which is your whole system?

Tradesman1 · Aug 9, 2016

Would be pretty much the same - the RJ should run 2133 at CL 14 maybe 13. If you get them and have a problem give a shout, the mobo it self will likely set looser timings

geofelt · Aug 9, 2016

It matters little.
But you really want a 2 stick kit so you can operate in dual channel mode.

At equal speeds, lower latency is better.
One figure of merit is to divide the speed by the latency. Higher is better.
Here is one study on DDR4 ram scaling.
http://www.newegg.com/Product/Product.aspx?Item=N82E16811163257

16wongmc1 · Aug 10, 2016

Thanks for the answer but I wanna ask that if my motherboard has two RAM slots, then if I buy the single stick RAM can I upgrade in the future by buying the same stick of RAM (making it 16gb in total)?

lucas_7_94 · Aug 10, 2016

Yes, you can. In fact, if you don't care the Dual Channel, you can put another RAM brand there.

For example. 8GB as Corsair and 4GB from G Skill

geofelt · Aug 10, 2016

16wongmc1 :

You are not guaranteed to work.
It is better to buy 16gb up front.

Ram is sold in kits for a reason.
A motherboard must manage all the ram using the same specs of voltage, cas and speed.
Ram from the same vendor and part number can be made up of differing manufacturing components over time.
Some motherboards can be very sensitive to this.
That is why ram vendors will NOT support ram that is not bought in one kit.
It is safer to get what you need in one kit.
But, it is a bit more expensive because of the added matching of all the sticks to insure compatibility.

16wongmc1 · Aug 11, 2016

lucas_7_94 :

geofelt :

Thanks for the input, I sure will take it into consideration when choosing the RAM for my build

Tradesman1 · Aug 11, 2016

geofelt :

16wongmc1 :

You are not guaranteed to work.
It is better to buy 16gb up front.

Ram is sold in kits for a reason.
A motherboard must manage all the ram using the same specs of voltage, cas and speed.
Ram from the same vendor and part number can be made up of differing manufacturing components over time.
Some motherboards can be very sensitive to this.
That is why ram vendors will NOT support ram that is not bought in one kit.
It is safer to get what you need in one kit.
But, it is a bit more expensive because of the added matching of all the sticks to insure compatibility.

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RAM latency speeds (mhz)

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