I only just bought this card yesterday so its brand new but haven't noticed this issue till now. I know the card is supposed to have 8gb ram but for some reason its only using 4?
screenshots:
unreal heaven benchmark - https://gyazo.com/88253d5b663b791508d3928c47b9b803
hwmonitor - https://gyazo.com/f6cacd4ec2d71a3aff51035341796053