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2-way SLI on Maximus V Extreme - best slots 8x/8x or 8x/16x?

feniks
Level 11
I am looking at ASUS MVE manual and it seems that for 2-way SLI ASUS proposes using Intel CPU native bandwidth for both cards (8x/8x natively) using slots PCIe3.0_1 (top first) and PCIe3.0_2B (third from top). I know that switches/bridges may cause some lag, so it makes sense *IF* each of cards doesn't exceed the PCIe3.0 8x bandwidth (I think 670 2GB cards don't but I am unsure of it).
Also this configuration allows for better air flow between cards which probably matters if one relies on air cooling ... I don't, both cards are water cooled.

however I see there is also another config possible which is based on 3-SLI configuration and for 2-SLI it would suggest using both top first and second slots, PCIe3.0_1 & PCIe3.0_2A respectively for x8/16x.

tomorrow I will be installing my second 670 2GB for 8x/8x config for now and I hope it works fine (no lag related to PLX chip switching).

does anybody have some benchmarks comparing same cards and CPU clock (and memory) running 2 cards in each of mentioned configurations?

Thanks!
.: R3C0NF1GUR3D :.
ASUS MVE :: 3770K bench @ 5.2GHz (delidded) :: 2x4GB Mushkin 996990 @ 2400MHz CL10 @ 1.7V :: evga 670 2GB SLI @ 1280/7108 :: Mushkin Chronos 240GB SSD RAID0 (OS) :: WD RE4 2TB (storage) 2TB :: Hitachi Deskstar 5K300 2TB (backup USB3.0) :: ASUS VG248QE 24'' 144Hz monitor

My rig with pictures
"We are what we repeatedly do. Excellence, then, is not an act, but a habit." - Aristotle
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stackoverflow13
Level 9
If you notice all that evga have done is double the clock value figure of asus because the 690 is 2 cards ie 2x 3004mhz. This is band marketing & wrong. all gtx 690's are the same. all have a memory clock of 3004MHz.
Asus Maximus XI Formula: i9 9900k @ 5.2 GHz: 2x8GB team group Xtreem Edition @4000Mhz: 2xRTX 2080TI: 1xSamsung 970 Pro, 3xSamsung 860 pro 2TB ssd: Creative Zxr: Custom water cooled loop: 2xAsus PG27UQ 4k @144Hz Gsync.

stackoverflow13 wrote:
If you notice all that evga have done is double the clock value figure of asus because the 690 is 2 cards ie 2x 3004mhz. This is band marketing & wrong. all gtx 690's are the same. all have a memory clock of 3004MHz.

you mean there are no different between asus and evga card? if its so ill go with asus. thankx mate.
It ain't over till the fat lady sings :cool:...

feniks
Level 11
actually the effective memory clock on 600 series is like that, around 6GHz while most software apps reports it halved (3GHz), it's normal. both specs (EVGA & ASUS) are correct though, just using different methodology 😉

for instance my 670 memory runs at 3506MHz as reported in GPU-Z or Precision X, but in fact that is effective 7012MHz. GDDR memory... effective double data rates, just like with DDR3 RAM, CPU-Z will report 1200MHz while one is running 2400Mhz.
.: R3C0NF1GUR3D :.
ASUS MVE :: 3770K bench @ 5.2GHz (delidded) :: 2x4GB Mushkin 996990 @ 2400MHz CL10 @ 1.7V :: evga 670 2GB SLI @ 1280/7108 :: Mushkin Chronos 240GB SSD RAID0 (OS) :: WD RE4 2TB (storage) 2TB :: Hitachi Deskstar 5K300 2TB (backup USB3.0) :: ASUS VG248QE 24'' 144Hz monitor

My rig with pictures
"We are what we repeatedly do. Excellence, then, is not an act, but a habit." - Aristotle