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z77 mATX with PCIE 3.0 PLX PXE chip? - Page 5

post #41 of 45
Quote:
Originally Posted by CallsignVega View Post

Vega, why is that so? I still can't get a grasp on bandwidth used by the PCI bus.
What is the difference between a 6990 and a 6970 quad fire?
Is it because it is only connected to 1 slot vs. 2 and using only one lane (I'm running out of ideas) with the pcb already having connections built in rather than on two separate cards?
GPU's one and two located on the 6990 don't have to communicate with each other over the PCI-E bus. They are directly linked on the card. This also allows a 16x/8x/8x lane allocation. The 6990 only has to talk to two 6970's and use two crossfire bridges. In a quad 6970 setup, the main card that hosts all of the monitor connections connects to the other three 6970's and has to communicate via three crossfire bridges and has to send entire frames between all the cards via the PCI-E bus, increasing bandwidth requirements. It is also on a slower 8x/8x/8x/8x lane allocation. [/quote]


Thank you for clarifying thumb.gif

See, I know I'm still vastly ignorant about these things. I read constantly, but I still don't understand all the technology behind these things all that well. I hope to eventually be able to make connections as to market flow and changes, such as Intel focusing on ARM marketplace now that other ARM manufacturers are doing so well and taking up the mobile computing workspace by storm while Atom is trying to catch a hold of the market post netbook phase. That little nugget of clarification was made by Duckie! See, it doesn't matter that I've been reading daily for the past 2.5 years about technology, I still can't make connections. On a basic level, hell I still don't know basic knowledge about hardware. It is infuriating to say the least. My point is how was I supposed to know any of this. When nf200 was being popularized post x58 (with nf100 just used for baseline SLI I believe around 478 and 775 back in the olden days), I didn't know what the hell a multiplexer even was. I mean, why really knows this stuff anyways? Turns out, a lot of this forum knows these things. I'm embarrassed and humbled on a regular basis.

Thanks for your clarification, as I've said, you really do know your stuff. Thanks for all the help Vega.
     
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post #42 of 45
NF2000 is only for PCIE 2.0, with gtx 690's if they allow any kind of overclocking (you might be limited by the pcie bus), however due to the memory data rate being a limiting factor, unless you are doing pure clock-based applications (not gaming with AA etc which need a large bandwidth) then the pcie bus MIGHT be the bottleneck, however in "real world" or gaming usage the memory bandwidth would probably be your primary limiter.

Secondly, these "bridge" chips don't really do much. There are a couple of reviews floating around, and they usually only improve performance by a maximum of 10%. You're better off getting native 16x 16x pcie 3.0, which nVidia has promised to fix.

Hold off until new drivers (unless they've already come out). I don't follow nVidia's 6xx drivers but they seem to have a beta driver and my brain seems to have a notion of them promising to fix pcie 3.0 on x79.

If they do I would recommend getting a (less efficient) 3820/3930k with an matx x79 motherboard.

There are two which are cheaper than all/most z77 boards ASROCK and MSI , there's a more expensive ROG board from ASUS .

No matx z77 board with MATX size has any form of pcie bridge chip.

You won't get much of a performance increase from it anyway tbh, don't kid yourself and if you're going to be getting gtx 690's sli (which probably wont be bottlenecked by an 8x 3.0 bus) you most likely wont be getting the 790's in sli and by the time the 890's come out (don't forget nVidia delays!!!) you'll most likely have upgraded your mobo/cpu and possibly your case to accompany a larger mobo teaching.gif.

Watch nVidia drivers and if they allow 3.0 pcie on x79 GOGOGO! Under water, as you say you will do, sandy bridge e will oc as good as ivy bridge. Secondly you wont miss the hd4000 if you have gk104 QUAD SLI drool.gif.

Enjoy!
Edited by JassimH - 4/13/12 at 1:21am
    
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post #43 of 45
Thread Starter 
Quote:
Originally Posted by JassimH View Post

NF2000 is only for PCIE 2.0, with gtx 690's if they allow any kind of overclocking (you might be limited by the pcie bus), however due to the memory data rate being a limiting factor, unless you are doing pure clock-based applications (not gaming with AA etc which need a large bandwidth) then the pcie bus MIGHT be the bottleneck, however in "real world" or gaming usage the memory bandwidth would probably be your primary limiter.
Secondly, these "bridge" chips don't really do much. There are a couple of reviews floating around, and they usually only improve performance by a maximum of 10%. You're better off getting native 16x 16x pcie 3.0, which nVidia has promised to fix.
Hold off until new drivers (unless they've already come out). I don't follow nVidia's 6xx drivers but they seem to have a beta driver and my brain seems to have a notion of them promising to fix pcie 3.0 on x79.
If they do I would recommend getting a (less efficient) 3820/3930k with an matx x79 motherboard.
There are two which are cheaper than all/most z77 boards ASROCK and MSI , there's a more expensive ROG board from ASUS .
No matx z77 board with MATX size has any form of pcie bridge chip.
You won't get much of a performance increase from it anyway tbh, don't kid yourself and if you're going to be getting gtx 690's sli (which probably wont be bottlenecked by an 8x 3.0 bus) you most likely wont be getting the 790's in sli and by the time the 890's come out (don't forget nVidia delays!!!) you'll most likely have upgraded your mobo/cpu and possibly your case to accompany a larger mobo teaching.gif.
Watch nVidia drivers and if they allow 3.0 pcie on x79 GOGOGO! Under water, as you say you will do, sandy bridge e will oc as good as ivy bridge. Secondly you wont miss the hd4000 if you have gk104 QUAD SLI drool.gif.
Enjoy!

the PLX PXE chip for the Z77 is PLX PXE 8747 chip not the nf200.

and I have already made a choice on the cpu/mobo. you can read a few post up.
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post #44 of 45
Quote:
Originally Posted by bhk1004 View Post

the PLX PXE chip for the Z77 is PLX PXE 8747 chip not the nf200.
and I have already made a choice on the cpu/mobo. you can read a few post up.

My bad***
    
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post #45 of 45
Is there anywhere review Crossfire/SLI PLX vs Native Intel on PCI-E 3.0 boards?
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