4Gb vs 8GB

[gupsterg]

Memory argument aside (which has more than been debated above in some detail) the VRAM is relatively meaningless if the card cannot full utilise it. Based on current prices and benchmarks, a R9 390 and a GTX 970 look about on par regardless - so if that's your price bracket think of which ones features you're going to use. Shadowplay/G-Sync/Physx or FreeSync/Mantle/etc? Both cards I'd argue will stand the test of time at 1080p and probably 1440p

Either way, you're left with a strong card.

+1 .

[Bonebreaker777]

I would go for the Radeon but it depends on the particular taste. If you have a bigger case, go for AMD. If you are rather limited (meaning less air to go around to cool) nVidia I would say.

[DeltaSierra]

Another interesting consideration is whether 3 crossfired 4GB cards will give better performance versus a single or dual 8GB card on a 4K display!?!

[AlphaA1]

I always wondered the same , thank you for the interesting discussion.

[Bonebreaker777]

Another interesting consideration is whether 3 crossfired 4GB cards will give better performance versus a single or dual 8GB card on a 4K display!?!

Very few games are limited by the 4GB RAM even at 4k. I say if you can scale properly, joined GPU performance will always wield better performance, albeit at a lot worse value.

[DanceswithUnix]

Another interesting consideration is whether 3 crossfired 4GB cards will give better performance versus a single or dual 8GB card on a 4K display!?!

Amount of ram doesn't matter there, if one card struggles with 4GB then a pair of 4GB cards in crossfire will still struggle. Given 4GB doesn't usually struggle (yet) it just comes down to grunt and whether a game behaves well with crossfire.

Interesting review here for a *2GB* R9 380, where in some games it does struggle through lack of ram. When it works, it seems pretty impressive though. Makes a pair of 4GB 380 cards look like a decent value at £300 vs a GTX 980, but with only 2GB some of those minimum frame rates fall off a cliff.

http://www.eteknix.com/amd-radeon-r9...ards-review/4/