The video ram is a buffer. Large amounts tend to have use only in ultra settings of the highest graphics games. Going from 2GB to 4GB for these cards, at top settings of games, only sometimes helps.
http://www.eurogamer.net/articles/digita... http://www.gamersnexus.net/guides/1888-e... The data is consistent that very few games on 1920x1080 need 4GB at this graphics performance level. When adding all games together the extra ram adds next to nothing. By performance, the GPUs are about comparable.
http://www.anandtech.com/bench/product/1... http://www.game-debate.com/gpu/index.php?gid=2436&gid2=2266&compare=geforce-gtx-960-2gb-vs-radeon-r9-380 Overall, the 4GB versions are comparable. You can compare slight difference in overclocking that move things a little. The real bottom line is not in slight performance variation.
NVidia 120 vs AMD 190 watts at reference levels (add 3 watts for 2GB extra ram on GTX 960) And, although crossfire is better on sli compatible boards, there are crossfire compatible that are not sli compatible. And, price again. R9 380 is a little cheaper.
If on ultra on a 4k display accepting lower fps the 4gb helps. I never like considering a graphics card in a stand-alone. Instead, a full system part list at the exact same price within a tiny margin is how to compare.
Comparing to cards is almost worthless, and just for discussion rather than buying one or the other. Cost of card, and cost of system counts https://pcpartpicker.com/parts/video-card/#sort=a8&page=1&c=208,186,310,355,311 You are showing an EVGA card now more expensive than a GTX 970 in the USA.
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