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Old 10-30-13, 01:39 AM   #5
wheeljack12
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Default Re: with the new price cuts, getting another gtx 770

the memory speed of a video card isn't a limitation on pci-e 2.0 meaning 5 ghz or 7ghz doesn't make a difference meaing ram clock speeds aren't a bottleneck. The main difference is how fast things move on the pci-e 3.0 bus. Pci-e 2.0 x16 is 8GT/second or in Lamens terms 8 gigabytes one way/16 gigabytes bi-directional meaning the cards sends 16gb in two directions (to and from the cpu). Pci-e 3.0 x16 is double at 16GT/second or 16gb second one way and or 32 gigabytes bi directional. The pci-e 2.0 bus hasn't even used up all of the bandwidth of the fastest cards being the gtx 690/radeon 7990 at about 350gb/sec. I know it doesn't make sense because of the high bandwidth but every review I have read said this. Anyhow, my brother's system uses a pci-e 2.0 x16 slot for video cards and he has used pci-e 3.0 cards on it with no problem. (zotac gtx 660 amp! at 158gb/sec memory bandwidth). And the performance difference between pci-e 2.0 and 3.0 is like 5-10 percent at most. So, don't worry about jumping to pci-e 3.0 as AMD themselves don't have pci-e 3.0 motherboards out yet but they sell pci-e 3.0 cards. Actually there is one motherboard (sabertooth 990fx 2.0/gen 3) that was custom built by asus to use pci-e 3.0 but that's it for AMD and you can't find that motherboard anymore for a reasonable price as it was discontinued. Anyhow, here is the wiki page for pci express:

http://en.wikipedia.org/wiki/PCI_Exp...CI_Express_3.0

btw, they made a mistake in the wiki, they say a 32x slot does 16 gb/sec in pci-e 2.0. 32 lane pci-e doesn't exist. 16 lane (16x) pci-e 2.0 does 16 gb/sec bi-directional unless server motherboards have 32 lane pci-e 2.0 slots in pci-e 2.0. Anyhow, if you can afford, try getting this, it's the fastest factory overclocked card out there for memory in the gtx 770 series (and pretty much the fastest in gpu speeds too):

http://www.zotac.com/products/graphi...p-edition.html

it does 230gb/sec bandwidth vs. the traditional gtx 770 224 gb/sec memory bandwidth.

here's a review on the gtx 770 amp from zotac:
http://hexus.net/tech/reviews/graphi...0-amp-edition/
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Last edited by wheeljack12; 10-30-13 at 01:56 AM. Reason: added review on amp gtx 770
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