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1st 2-pci slots (x16 by x16) vs 1st&3rd (x8 by x8)

  • Asus
  • SLI
  • Graphics
Last response: in Graphics & Displays
January 20, 2014 1:29:40 PM

i am setting up my sli , i have the two cards in my asus "MAXIMUS VI EXTREME " , i have them in the 1st two slots that are x16 and x16 . would i get the same results if i use x8 by x8 , ( so there will be more of a space between the cards for mare air flow )

or should i just leave them in the 1st two slots that are x16 x16

on this page half way down on the "overview" tab

it says "

Four-Way SLI™ / CrossFireX™ Support

Perfect spacing and excellent PCI Express 3.0 performance
Unique ROG design supports four-way SLI™ / CrossFireX™ and enables their full power for latency-free graphics, while an onboard PCIe 3.0 x16 switch allows you to adjust configurations for the best graphics output. "

please any advice would help at this point
I assume the 16x is more power? and the x8 are less ? i see the x8 by x8 is equals x16 on this page , but am i better of keeping them both in the x16 slots ? or are they both only pulling x8 x8 =x16 or is it pulling x16+x16=x32

so if u count down the pci slots it goes

its has 1 and a2 - both are x16

i would like to have it set as

1 (x8) +b2 (x8) =x16

now it shows, to set up it as the (1 , b2 - slots )

but if its better to have it as the (1,a2 =x32)
i will just keep it as that , cuz it doesn't get that hot under full load ,

but it is better to have that space between for air flow ( considering there is no gpu water blocks )

More about : 1st pci slots x16 x16 1st 3rd

a c 150 Ĉ ASUS
January 20, 2014 1:35:29 PM

I suggest testing in both situations and sharing the results.
Use a free benchmarking software ( or look for similar).
Check the temperatures using HWMonitor or similar.
January 20, 2014 1:43:21 PM

its a maximum vi extreme , not a z87 , and it shows those two lanes are x16
January 20, 2014 1:45:26 PM

i see there is also a ez/plug for the sli set up , but do i on l;y need to plug that in if i have 4 cards going?
a b Ĉ ASUS
January 20, 2014 1:45:32 PM

I looked at the manual, page 1-20 shows the modes. Haswell / Z87 doesn't support that many native lanes, but with PLX switching things change (ergo my edit / delete)

and yes, your board IS a Z87. that's the chipset on it. Z87 / LGA1150. heck, you linked it! :p 
January 20, 2014 1:50:01 PM

o yes , sorry you guys are right , its the upgraded z87 , i dont know why i thought it was some thing else

but i am just going to bench mark with my "MSI Kombustor 2.5" (that's what i used on my laptop)

I will post what it turns out that is better (you guys are probably right with having it as ( 1 & b2 )

( but what i was trying to ask just in general , having two x16 is better then two x8 ?) if there is a difference, would it be more on the 5% or more on the 30% side ) just looking for a educated opinion (guess)

Best solution

a b Ĉ ASUS
January 20, 2014 1:53:57 PM

well, if you REALLY want dual native 16x lanes, go buy an LGA2011 or (puke) AM3+. those support 40 PCIe lanes, which is enough for dual 16x and then some.


For SLI / CrossFire, though, it doesn't matter since a PLX chipped mobo is probably cheaper and all the cards in the group receive the same data to work with anyways (and spit it out onto the same one screen). For SLI / CF, just get one with a PLX. For independent displays, getting LGA2011 or AM3+ would be more sensible.
February 4, 2014 11:55:06 AM

so, i did some moving around , 3- 4 diffent ways, not much of a diffrence between them all , for hightest i got 2,545 to lowest 2,012,,,so ,,

it did make a diffrence they way asus suggests, but only insuch a way its only like most of 150, but i did also see a difference with the ez plus above the card on the board next to the cpu and the back plate with all the out for audio, but not much , i think it would make a more of a diffrence with 3 or 4 cards , , i was shocked to see that it gave me 50 points (give or take) thought that was more for if u have 4 card that need more power , so i have the ez pluged in still with the 6pin , and the 4 pin , even though it doesnt look as clean , i got the wire looking nicer then what u think it would turn out to be ,,

so i have the two plugz for ez extra power ( one -6pin / one -4pin )
I have my monitor plugged in the bottom card
with the top card set a the possessor for the sli ( that way it gets a full loop < instead of having to backtrack back through the same card twice )
i get the best results this way , let me know if u come across this though Google search and happen to find a better way that i might not though of

Sorry for not making easier to read , in a rush

Thanks for all the advise guy , hate when ppl get off subject, or dont even give a half good/legit ,answer