2400 Mhz (8gbx2) OR 3000Mhz (16gbx1)

[Keshav_Markovnikov]

Corsair Vengeance CAS16 2400Mhz (8GBx2)
Or
Corsair Vengeance CAS15 3000Mhz (16GBx1)

currently both are at same same price in my country (India)
Which will perform better?

 

[gussrtk]

better off with the 2x8gb. Motherboards have "dual channel" memory mode, which will provide better system performance. But, you probably won't see much of it through use.

 

[fluked]

16GB. Later, another 16GB (or not).

 

[Half Life]

i hope you are aware that in either of the specs, you will need a) motherboard that supports memory overclocking, and b) cpu that can take advantage of the extra clock

 

[Keshav_Markovnikov]

i hope you are aware that in either of the specs, you will need a) motherboard that supports memory overclocking, and b) cpu that can take advantage of the extra clock

Yes
My specs are

Processor i7 7700k
Cpu cooler Deepcool Assasin ii
Motherboard Asrock z270 extreme 4 (Supports 3866 Mhz + OC)
Ram ??
GALAX GTX 1070
1 TB hdd
256 GB SSD
PSU Seasonic S12 620W
Case Antec GX900
I will be Rendering Videos and will sometime play GTA 5 and Witchers 3

 

[Half Life]

anandtech.com had a good article with a detailed table on this; I will see if I can share it with you;

 

[ccampy]

the 2x8 gb will be the preferable to run dual chanell but in the real world either you will only get a benefit in benchamarks

 

[Half Life]

this one is for DDR3, but has a very good depth of information on comparison between speed vs latency ; some of the inferences apply to all RAM in general

http://www.anandtech.com/show/7364/memory-scaling-on-haswell