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rampage V extreme X99 dedicated physx

TSportM
Level 11

‎05-25-2015 03:28 AM - last edited on ‎03-06-2024 02:52 AM by Community Admin

hello, could some one share same light i have 2 Dcii 780ti in sli and i have a 750ti here that i want to put as a dedicated physx card

i have a 28 lane cpu the 5820k


could i use the red pci E in the middle of the sli ? or the bottom one ?

here is the setup

[Imgur](http://i.imgur.com/opWdO5n.jpg)

regards
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TSportM
Level 11

‎05-25-2015 05:40 AM

any help please ? any one
Rig1 - 14900KS - P112 - E88- MC86- Pcore 6.0/6.2/6.3 Asus Z690 Maximus Extreme - Ecores 4.7 - 48GB TForce 7200#64;7400ddr5 - MSI Suprim X RTX 4090@3070mhz - 24gb memory speed - Powerby corsair Ax1500i - Corsair1000d@custom Loop Rig2- 10920X@4.9 - Aorus X299 gaming 9 - gskill 3200@3600 - Zotac RTX 2080Ti - Powerby CM1200 - Noctua NHD15 black - Corsair 900D
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Menthol
Level 14

‎05-25-2015 06:47 AM

The 5820 does not have enough pcie lanes to run 3 Nvidia cards at the same time, I don't believe the configuration you are looking to run is an option for you. You could try the bottom slot but I don't thin it will work
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TSportM
Level 11
In response to Menthol

‎05-25-2015 01:03 PM

Menthol wrote:
The 5820 does not have enough pcie lanes to run 3 Nvidia cards at the same time, I don't believe the configuration you are looking to run is an option for you. You could try the bottom slot but I don't thin it will work


the 5820K is a 28 lane CPU there four is capable of 3 way SLI

right now i have on the config 16X on the first GPU and 8X on the second one

on pci express gen 3 8X to 16X is irrelevant on todays gpu´s

cheers
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Chino
Level 15

‎05-25-2015 07:31 AM

TSportM wrote:

could i use the red pci E in the middle of the sli ? or the bottom one ?

You can use the middle red PCIe lane. 5820K users do not have access to the last PCIe lane.

As a sidenote, if you populate the second PCIe lane, your GPUs will drop from x16/x8 to x8/x8.
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Korth
Level 14

‎05-25-2015 07:15 PM

The 5820K has enough lanes to run x8/x8/x8, yes? Configure your slots as x8 (not x16) in the EUFI/BIOS.

Although I think your x16/x8 780Ti cards might give more fps overall without the 750Ti PhysX onboard. Their specs are too mismatched, that wimpy old 750Ti would hold you down more than it would help out. Unless you play the few game titles which lean very heavily on PhysX.
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[/Korth]
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avsquare
Level 7
In response to Korth

‎05-27-2015 03:39 AM

Korth wrote:
The 5820K has enough lanes to run x8/x8/x8, yes? Configure your slots as x8 (not x16) in the EUFI/BIOS.

Although I think your x16/x8 780Ti cards might give more fps overall without the 750Ti PhysX onboard. Their specs are too mismatched, that wimpy old 750Ti would hold you down more than it would help out. Unless you play the few game titles which lean very heavily on PhysX.


iirc if you plug the cards as per manual it will auto configure.

2 cards: goes to to 1st and 3rd red slot for x16/x8 config
3 cards: goes to first 3 red slots for x8/x8/x8 automatically
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Arne_Saknussemm
Level 40

‎05-27-2015 03:09 AM

I investigated using an old card (570) with SLI 680s and SLI Titans once....found it no help or an actual decrease in performance since the old card did not run PhysX as well as the new cards and in SLI it was rarely the case that the second card was so loaded it needed help running PhysX.

Guess It will depend on how close to the limit you are pushing the 780tis

As has been said last slot is not an option so slot between SLI would be needed and then the airflow compromise etc might make this a fairly useless enterprise.

Sell the card and put the money towards watercooling for the GPUs would be the best performance increase 😉
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