Having used the X3 for a few months, I can safely say that it is powerful enough to drive my HD600 and He4XX. With the HD600, I often set my volume at around 25-35 windows volume. When playing pubg, I usually have to set to 50 volume max. High gain setting is used.
The He4xx is a little more power hungry even though it's 35ohms. At low gain, I usually have to set windows volume to around 30- 50 for YouTube, and around 50-65 for games like Escape from Tarkov.
VSS wise, you can either use the SXFi feature on the X3, or use Creative's SBX suite. For atmospheric games, I prefer using SXFi. For really competitive FPS games, you might want to use SBX instead, as SXFi will dial down certain audio cues to make it sound natural. To me though, I felt that SXFi is accurate enough that I wouldn't want to switch back to SBX.
I can't comment on the GSX, since I never tried them. But I have heard that the VSS on the GSX sounds better than SBX.
PS: I want to add that if I use high gain for the HE4XX, my gaming volume rarely goes above 50. But I was told through Creative's worldwide support that I risk damaging the headphones since it is only has an 35ohm impedance. I forgot to ask the engineer about this when I was at the Customer Service centre that time, so I do not know how true that is.
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