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Old 10-30-13, 01:39 AM   #5
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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:

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):

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:
gigabyte f2a78m-d3h mb, 32gb ddr3-2400 mhz ram in dual channel,amd a10-7850k 3.7 ghz quad core cpu, zotac amp extreme gtx 970 4gb vc,OCZ vector 150 240 gb ssd,antec 650 watt 80 plus platinum psu,corsair carbide 500r white case,lg 16x bluray writer, steelseries 6gv2 keyboard ,insignia 24' 1080p tv, logitech g502s 12000 dpi mouse ,xbox 360 wired controller for windows,visiontek usb 3.0 120gb ssd flash drive,windows 8.1 64 bit,creative labs sound blaster z pci-e sc,logitech z506 5.1 speakers

I'd rather walk with God in the Dark than shine in the light alone.

Last edited by wheeljack12; 10-30-13 at 01:56 AM. Reason: added review on amp gtx 770
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