Would be interesting to see if you could actually play without issues at 1080p.I would think memory usage would exceed the 1gb considering how close to 1gb it's at just at 768p on all low.
If exceeding doesn't bring any issues or stutter and it plays well enough st 1080p,i would run with that over anything else.
depending on the card you can brute force some stuff and ignore via setting. On my gtx 580 it had enough grunt to do a lot of the settings and with regular grass and water was able to use ultra settings on alot of stuff. Now my 6950 I was able to use higher res and FXAA but had to turn down a bunch of other stuff though its much smoother than the 580.
Try ignoring and see what happens. I think this game plays well on older cards. There is a texture compression hack but it gets you banned from online so only use it on single player though I cant vouch for it and have no idea if it has malware just passing the info.
Recent update to afterburner stopped the random crashes I was getting in GTA5. So weird that AB was the culprit or more accurately how it interacted with the drivers.
Some useful tricks.
If your the pilot of the plane in the Prison break finale just follow the first plane you see and stick in its rear. It flys around like a noob and doesnt do any crazy manuevers allowing the heli pilot to lock on from range to targets in the prison helping the team on the ground instead of the plane.
When the ground team signals they are close to exit head back to prison in the plane since the plane will leave as soon as Rashkovski gets in the truck.
Now if your the driver of the truck dont get near the field TILL THE PLANE LANDS so you dont attract the popo.
Make loops of the hill to the south of the strip since they cant follow you there.
Good heli pilot is needed.
When doing some missions stay in your Kuruma and pick off most of the baddies before getting out.
SO many noobs run in like Leeroy Jenkins on easy stuff.....
Take time to explain the heists before you start them. Even if you team says they know what to do they might not know some of the tricks flying the heli around the yachts to draw fire from the players on the ground.
Its amazing how NPCs ignore ground stuff when someone is flying around above.
BTW the first time Danger Zone played after getting the off the carrier and shooting down the planes was and will probably stay in my top 10 moments in gaming ever. I was cheesed to no end!