is having two 3gb gpus better or equal to having one 6 gb
- Thread starter PapaZach
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Forgotten031511
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- Jun 1, 2015
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No!
With SLI or Crossfire, the VRAM does not stack. If you Crossfire two (2) R9 280X with 3GB of VRAM, you still technically have 3GB of VRAM. But since each card is only rendering half of the screen, each card will require less VRAM and allow you to increase your resolution and FPS.
I know this makes NO SENSE what so ever, but Crossfire and SLI, do not stack VRAM.
Before I advise on getting a second R9 280 or a GTX 980 Ti, what are you trying to do? Game in 4K or max out some more settings?
With SLI or Crossfire, the VRAM does not stack. If you Crossfire two (2) R9 280X with 3GB of VRAM, you still technically have 3GB of VRAM. But since each card is only rendering half of the screen, each card will require less VRAM and allow you to increase your resolution and FPS.
I know this makes NO SENSE what so ever, but Crossfire and SLI, do not stack VRAM.
Before I advise on getting a second R9 280 or a GTX 980 Ti, what are you trying to do? Game in 4K or max out some more settings?
Close, but incorrect.
Each card is rendering half the screen, but each card needs a mirror of the entire scene in vRAM still, not half. (in SFR mode/Split-frame-rendering)
Cards usually use Alternate frame rendering too I believe, which means the cards take turns rendering future frames.
jimmysmitty
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- Oct 5, 2007
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http://www.anandtech.com/bench/product/1440?vs=1496
That should give you a decent picture. The R9 280X is a rebranded HD7970 and a HD7990 is the same as crossfire HD7970s (it is a dual GPU card). In most cases, the GTX 980Ti beats the HD7990, especially in higher resolution games.
If you want a performance upgrade and plan to game at 1440p (2K) or 2160p (4K) then going to a single GTX 980Ti will be the best boost, especially since you wont need a better PSU as you might need if you add a second R9 280X.
That should give you a decent picture. The R9 280X is a rebranded HD7970 and a HD7990 is the same as crossfire HD7970s (it is a dual GPU card). In most cases, the GTX 980Ti beats the HD7990, especially in higher resolution games.
If you want a performance upgrade and plan to game at 1440p (2K) or 2160p (4K) then going to a single GTX 980Ti will be the best boost, especially since you wont need a better PSU as you might need if you add a second R9 280X.
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