@Gaming-Planet said:
@04dcarraher said:
@Gaming-Planet said:
128-bit bus is still too slow. It'll stutter.
Bus width has really nothing to do with stuttering, lack of vram causes the problem. and with very high settings with standard textures GTA 5 stays below 2gb at 1080p. The maxwell series uses compression methods to overcome the narrower bus. Same reason why the 970 and 980 with 256bit buses having no issue competing with 512bit bus based cards all the way to 4k.
The amount of bandwidth is calculated with the memory clock. Trying running 4k textures on a 960 that has 4gb.
I'd say they're kind of "separate but related" issues -
memory size (2GB vs 4GB) is going to come into play *mostly* above 1080p, because we are dealing with larger textures, but some recent games do eat more than 2GB when its available at 1080p. It's an interesting debate... there are a handful of reviews of 2GB vs 4GB 960 out, and they generally show very little benefit of the extra RAM at 1080p but its limitations do manifest in these boundary cases (eg. this comparison page)
Bus width (128-bit vs 256+-bit)*memory clock speed controls access rate to the RAM, whatever memory size it may be. Now... when your RAM starts to run out, the card has to swap RAM contents more frequently, and at that point the bandwidth becomes particularly critical. So here is a case where 4GB also helps avoid issues due to small memory bandwidth. The memory compression used by Maxwell (and related technology in the R9 285) does make a surprising impact here... I'm amazed how well the 128-bit 2GB 960 does in benchmarks. Again, if you REALLY search around, you can see it start to break down at those boundary cases... even the memory compression can only take a low-bit memory bus and small memory pool so far. But it's pretty remarkable what it can do. Personally, I would have loved to see a 256-bit 3GB 960 over a 4GB 128-bit any day. It would be such a versatile card. To be honest... they probably just don't want to poach from the 970 given its relatively high price point (but also fantastic performance!)
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