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Upgrading from pcie 2 to 3?

post #1 of 6
Thread Starter 
Hey all, I'm probably beating a dead horse here, but I couldn't find much in terms of actual performance enhancement data for the jump from pcie 2 to 3.

I'm looking to upgrade my CPU here fairly soon to either an FX 8350, or a i5 3570k, I'm currently sitting at a fx 6100. My governing choice, as reviews of both chips seem to be in nearly the same avenue of results for gaming, is going to be determined upon whether I feel it is necessary to upgrade to pcie 3 slots for my 2 gtx 670 cards.

So I ask you oh wise computer gurus, is it worth the extra hundred dollars to modernize my pcie slots, or will there not be much of an improvement?
post #2 of 6
Get the i5, it will murder the FX in SLI/CF performance. Regardless if it is pci-e 2.0 or 3.0
Though I would get 3.0 if available, as pci-e 3.0 at 8x is equal to pci-e 2.0 16x. So really between the AMD and Intel setup your getting the same amount of pci-e bandwidth.
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Red Dragon
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post #3 of 6
Quote:
Originally Posted by DzillaXx View Post

Get the i5, it will murder the FX in SLI/CF performance. Regardless if it is pci-e 2.0 or 3.0
Though I would get 3.0 if available, as pci-e 3.0 at 8x is equal to pci-e 2.0 16x. So really between the AMD and Intel setup your getting the same amount of pci-e bandwidth.

I believe z77 boards without plx chip will only offer one 16x pcie 3.0 lane while the 8x is pcie 2.0 and assuming he's considering only a "extra hundred" I don't think he'll be edging for a higher tier board. This applies to 4th gen processors as well though I am not sure on that.

As for OP I would say going with a 3rd or 4th gen processor yields a better overall investment and I'm not trying to start a war or anything but intel's IPC is far too superior. Last I check pci 3.0 high end cards provided a 5% max difference but you can read more @ http://www.hardocp.com/article/2012/07/18/pci_express_20_vs_30_gpu_gaming_performance_review#.UcxkzJzhd8E
post #4 of 6
Quote:
Originally Posted by DzillaXx View Post

Get the i5, it will murder the FX in SLI/CF performance. Regardless if it is pci-e 2.0 or 3.0
Though I would get 3.0 if available, as pci-e 3.0 at 8x is equal to pci-e 2.0 16x. So really between the AMD and Intel setup your getting the same amount of pci-e bandwidth.

Wouldnt matter too much unless you go over 2 high end GPUs on AMD setups. Then the PCIe bus starts to bottleneck.
post #5 of 6
Thread Starter 
Thanks for the awesome replies everyone, so from what I'm understanding is that there will not be that drastic of a change from the PCIe 2 to 3 interfaces, but the 3570k is a much more suitable CPU for SLI than the FX 8350 would be? My goal is to build a machine that will stay competant to a degree for the next 3 years or so while I'm in school and don't have cash to blow on computer parts like I do now (Hence the 2 GTX 670s, had I known how soon the 700 series was coming out I would have waited, but oh well).

Also, a PLX chip was mentioned in a post above, how can I go about telling if a motherboard is equipped with one of these? Newegg doesn't appear to show whether or not a motherboard has it. (maybe I don't know what I'm looking for?)
post #6 of 6
The Intel option is definitely the way to go.

As for the motherboard, if it says it supports anything more than "1 @ x16/2 @ x8 + 1 @ x4", it's using a PLX chip. Z77 (well, Z68/Z77/Z87) only has native support for 16 PCI Express lanes, but the PLX chips multiply them. If you want more native lanes, then LGA2011 is the way to go, with 40 native lanes.
   
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