I'm currently building a gaming desktop and I was looking to SLI my EVGA GTX 580 3GB with the ASUS GTX 580 1.5 GB.
I understand the consequence of doing this involves essentially losing 1.5GB from the 3GB card.
My question is though: Is it worth it? What I mean is: Will a single 3GB 580 card run more efficiently and provide better performance than running an SLI setup with the 3GB 580 and the 1.5GB 580 where 1.5 GB of VRAM are lost?
SLI is faster, IF you have the CPU to handle it without bottlenecking. The extra memory will only matter at ultra high multiple monitor resolutions.
If I were you, my vote would be for the single 3GB card to save money and electricity, and still kill any living game you throw at it. The GTX 580 is the ultimate video card for this generation. The SLI will be faster, but the single card is still more than enough. All the same, you will still have the option to upgrade to a second 3GB card in the future as well.
A GTX580 SLI is always going to be more powerful than a single GTX580 with x amount of VRAM.You only have so much power a single GTX580 can deliver.You will see a lot more performance with SLI than a single.And unless your using 3D surround or Eyefinity than the extra RAM that you loose won't matter much at all.
Wrong, wrong, wrong. 2 x 1.5gb cards still = 1.5gb useable, everything in the ram of both cards is mirrored, they both contain the same information, 2 cards doesn't increase the amount of useable memory. a 3gb + 1.5gb card still has 1.5gb useable memory as the data in both has to be mirrored and since the 1.5gb card cant mirror 3gb, the total vram available is of the lowest memory card.
Add to that the fact that while SLI/Crossfire has a better average performance than single cards, they do feel a lot worse than a single card setup when the frame rates are low. Sometime Vsync will also hamper multi-card setups. From personal experience, if you have the money for a single powerful card, buy that.
I just stumbled upon this thread and I'm building a PC for a friend and we have been considering getting 2 GTX580s 3GB from EVGA. He has the money for 1 or 2. My question is, should we just get 2 cards? One comment here said vsync will hamper multi-card setups. Is that true? My friends uses vsync in all his games. Anyways 2 cards or 1? Going for the best performance. Price isn't a factor.