What memory is used ?

Hynix. As are the Sapphire and Powercolor variants I have, seems Samsung was only on the reference cards.

On all of the videos I've seen the lighting on the card is only red is that it or is it true RGB ???

According to the Asus website it is true RGB but requires the Asus Aura Sync software to utilize the RGB. I own the card but have not installed the software (mining rig), stock it is red with a slow pulse but Asus website does show them in RGB functions.