Dual vs Single Ranked RAM

[Arun05]

What is the difference between a Dual and single Ranked RAM is there any performance difference in regular use and gaming?

I would like to know the difference between these two and other similar RAM comparisions
Kingston HyperX Fury 8GB DDR4 2133Mhz C14
HX421C14FB/8 VS HX421C14FB2/8

http://www.kingston.com/dataSheets/HX421C14FB_8.pdf
VS
http://www.kingston.com/dataSheets/HX421C14FB2_8.pdf

For the Dual Ranked(HX421C14FB/8)
Refresh to Active/Refresh
Command Time (tRFCmin) - 260ns(min.)

For the Single Ranked(HX421C14FB2/8)
Refresh to Active/Refresh
Command Time (tRFCmin) - 350ns(min.)

HyperX HX421C14FB/8 is a 1G x 64-bit (8GB) DDR4-2133 CL14
SDRAM (Synchronous DRAM) 2Rx8, memory module, based on
sixteen 512M x 8-bit FBGA components per module. Each module
kit supports Intel® Extreme Memory Profiles (Intel® XMP)
2.0. Each module has been tested to run at DDR4-2133 at a low
latency timing of 14-14-14 at 1.2V.

HyperX HX421C14FB2/8 is a 1G x 64-bit (8GB) DDR4-2133 CL14
SDRAM (Synchronous DRAM) 1Rx8, memory module, based on
eight 1G x 8-bit FBGA components per module. Each module kit
supports Intel® Extreme Memory Profiles (Intel® XMP) 2.0.
Each module has been tested to run at DDR4-2133 at a low latency
timing of 14-14-14 at 1.2V.

 

[rgd1101]

do they have the same spec?

 

[Arun05]

do they have the same spec?

I would like to know the difference between these two and other similar RAM comparisions
Kingston HyperX Fury 8GB DDR4 2133Mhz C14
HX421C14FB/8 VS HX421C14FB2/8

http://www.kingston.com/dataSheets/HX421C14FB_8.pdf
VS
http://www.kingston.com/dataSheets/HX421C14FB2_8.pdf

For the Dual Ranked(HX421C14FB/8)
Refresh to Active/Refresh
Command Time (tRFCmin) - 260ns(min.)

For the Single Ranked(HX421C14FB2/8)
Refresh to Active/Refresh
Command Time (tRFCmin) - 350ns(min.)

HyperX HX421C14FB/8 is a 1G x 64-bit (8GB) DDR4-2133 CL14
SDRAM (Synchronous DRAM) 2Rx8, memory module, based on
sixteen 512M x 8-bit FBGA components per module. Each module
kit supports Intel® Extreme Memory Profiles (Intel® XMP)
2.0. Each module has been tested to run at DDR4-2133 at a low
latency timing of 14-14-14 at 1.2V.

HyperX HX421C14FB2/8 is a 1G x 64-bit (8GB) DDR4-2133 CL14
SDRAM (Synchronous DRAM) 1Rx8, memory module, based on
eight 1G x 8-bit FBGA components per module. Each module kit
supports Intel® Extreme Memory Profiles (Intel® XMP) 2.0.
Each module has been tested to run at DDR4-2133 at a low latency
timing of 14-14-14 at 1.2V.

 

[Dawzey]

Scroll down to page 2 on the spec cheets and CAREFULLY look at the Ram. There you will notice 2 distinct differences. The performance is litterally not noticeable, these specs are more geared towards servers, which need specific channel configurations. Basically buy whichever one costs less, because they are virtually identical to the average consumer. However if you ARE building a server, the answer becomes much more complicated.