The PlayStation 4 port of Red Dead Redemption does actually include a major graphical update.
Red Dead Redemption 3 confirmed by Rockstar parent company, release window teased, red dead redemption 3
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Rockstar Games has apparently ditched the Red Dead Redemption 2 remaster
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Rockstar Games Officially Reveals Red Dead Redemption Remaster
Red Dead Redemption Switch, PS4 & PS3 Comparison Shows an Impressive Switch Version
Red Dead Redemption Remaster More Likely as Evidence Mounts
Will You Be Buying Red Dead Redemption on PS4?
There's No Redemption For Rockstar's Red Dead