RuslanZab

Gaming headphones are more for looks, audiophile grade is for the audio quality.
Depending on your motherboard you might not have a need for a DAC, some motherboards have very ok built in headphone amps.
 
Its not complete nor correct info here. Let me add/append.
 
Lets skip the first sentence i dont know what you mean.
DAC is Digital to Analogue convertor, it makes the bits ( ones and zero's) into sound. Your onboard audio also has DACs for the same reason.
 
Headphones have a higher impedance then line-level equipment most of the time.
Most input for PC speakers and most amps are around 100 Ohms. Better headphones can get up to 600 Ohm or more.
That does put more strain on the amplifier circuits, thus they need to be better. Else there will be no power/volume.
 
300 Ohms is a nice medium, you could try without an amp and see how far you come.
But if you really have to crank the volume (not to far tho, dont wanna overpower it) to even hear something, you DO need that amp. 😉

It’s a completely different experience. It’s almost not even comparable. 
 
6xx’s are an end game headphone, with proper source and when driven well, they are some of the best sounding headphones in existence; they scale incredibly well with good amp and dacs.
 
The schiit stack is a fantastic amp and dac setup, 200 bucks and it’s 90% as good as much more expensive options. And they “pair” well with 6xx’s as the amp has loads of power which the 6xx’s need. 

A quick Google search shows it to be from an INCREDIBLY old (released 1983, discontinued 2001) IBM business management suite called Applix.
 
Apparently support for the format is retained in a piece of Linux software called Applixware - http://vistasource.com/index.php?id=applixware

Well it's basically a CSV-like text file but there are no column names...

Not that I can see, it's probably some random export from their ERP with no info whatsoever, if the goal is for you to have a useable catalog-like and not to just import that into your identical systems it seems the person who gave that to you has no idea what they're doing...

It's likely just the fact that most games still don't utilize many cores and favor faster clock speeds. 

This is a pretty common thing asked about on the forum, basically it is showing the correct speed. DDR stand for double data rate, so if the memory speed is shown as 1200MHz, it is really 2400MHz. 

What motherboard do you have?
Did you try the ports on the case?