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[Official] Asus Rampage IV Black Edition Owners Club! - Page 649

post #6481 of 14918
Check the manual for recommended configs. You can also use UEFI to check what the lane allocation is (don't have them running around in my head) You should be using the molex connector to supplement PCIe power with three cards. The board's power plane is fine to supply power to multi-GPU setups. What you are fighting is the limits of the ATX connector to supply the current without suffering from thermal breakdown. That's why the molex connector is there to share the current demands.

Anything outside that might be some kind of PCIe gen 3.0 or PCIe training issues due to OC etc.

-Raja
post #6482 of 14918
Quote:
Originally Posted by Raja@ASUS View Post

Check the manual for recommended configs. You can also use UEFI to check what the lane allocation is (don't have them running around in my head) You should be using the molex connector to supplement PCIe power with three cards. The board's power plane is fine to supply power to multi-GPU setups. What you are fighting is the limits of the ATX connector to supply the current without suffering from thermal breakdown. That's why the molex connector is there to share the current demands.

Anything outside that might be some kind of PCIe gen 3.0 or PCIe training issues due to OC etc.

-Raja

Hi guys who give me a help? Should I overclokkare but are not very practical for UEFI BIOS, this and 'my first UEFI motherboard ... I have a 4930K and 32GB ram corsaair platinum 8x4 2133 CL 9-11-11-31 - 1.65volt. I would like two quiet settings, and a stronger one .. Thanks in advance.
post #6483 of 14918
Quote:
Originally Posted by Raja@ASUS View Post

Check the manual for recommended configs. You can also use UEFI to check what the lane allocation is (don't have them running around in my head) You should be using the molex connector to supplement PCIe power with three cards. The board's power plane is fine to supply power to multi-GPU setups. What you are fighting is the limits of the ATX connector to supply the current without suffering from thermal breakdown. That's why the molex connector is there to share the current demands.

Anything outside that might be some kind of PCIe gen 3.0 or PCIe training issues due to OC etc.

-Raja

Thanks! I do have the 4 pin molex connected and the manual recommends 1,2,3 (referring to 3.0 lanes). The lane config should be the same at 16, 16, 8 for 1,2 4 as far as i can tell (vs 16,8,16). Flickering happens only when really pushing the cards (especially @ 4K). If i figure this out I'll post my findings... btw, this does not occur when using (any two) two cards in sli, only when running 3. Nonetheless, swept first place in 2 and 3 card 3DMK11 P and X HOF ! thumb.gif

oh i happened to notice that in the manual that shipped with the board, page 1-23, third bullet in the figure on top of the page, should read 4-pin molex and not 6-pin PCIE

"might be some kind of PCIe gen 3.0 or PCIe training issues due to OC" blinksmiley.gif Huh?
Edited by Jpmboy - 3/14/14 at 6:19am
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post #6484 of 14918
Try a single PSU on its own. Other than that no idea.
post #6485 of 14918
Quote:
Originally Posted by Raja@ASUS View Post

Try a single PSU on its own. Other than that no idea.
ah - if only there was one powerful enough. Three OCd 780Ti Kingpins will shut down any single PSU... Actually, 2 will bring all but a few to OCP. (the PCP&C T12W can hold out the longest).
Could the 3V (and maybe 5V) rails/planes be the weak link.
What is PCIE "training"?
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G.Skill 3600c15 2x8GB kits Samsung 960 Pro, NVMe WD Raptor 1T Plextor SSDs Raid 0 
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post #6486 of 14918
Quote:
Originally Posted by Jpmboy View Post

ah - if only there was one powerful enough. Three OCd 780Ti Kingpins will shut down any single PSU... Actually, 2 will bring all but a few to OCP. (the PCP&C T12W can hold out the longest).
Could the 3V (and maybe 5V) rails/planes be the weak link.
What is PCIE "training"?


1) Some PSUs don't like being used this way. Ground potential between units will be different (can cause havoc with current and safety sensing). There are some units out there that will even kill GPUs if they are run in tandem with other PSUs. We killed a Titan like this at an OC event.

2) There are no issues with the board power planes. We've had 4 cards under LN2 clocked high and CPUs running over 6GHz without problems.

3) PCIe training occurs at POST to map devices and de-skew any timing variance on signal lines. Initially I thought you were referring to POST issues - but re-read your post and realized you have issues under load. Almost certainly sounds like a PSU issue to me.

You probably need to debug number one properly. Not much I can suggest as it seems you have confined yourself to building or running a system that needs multiple PSUs - it's just not a good thing to do with some PSU combos (it's not good period for 24/7 systems really). Once you can debug that part you can start looking at if it's a board level fault (won't be power plane related).
Edited by Raja@ASUS - 3/14/14 at 7:51am
post #6487 of 14918
Raja, Please can you tell me what Voltages you would input into the INITIAL and EVENTUAL PLL TERMINATION VOLTAGE SECTION?? The guy's on here say 1.45v as a common guide to use and could you give me your suggestions!!

Also would you leave the CPU PLL TERMINATION on AUTO???






Respectfully,

AJ.

P.S. Thanks.
post #6488 of 14918
If you're not running the CPU cold or running very high memory speeds then leave these settings alone (no need to adjust for the sake of it)
post #6489 of 14918
OK thanks for the Advice, but i have my memory OC to 2400Mhz and would like to go higher and i do a lot of Benchmarks for scores on the HWbot!!

That is the main reason why i asked you this question, to see if there would be any Advantage in using it in the Bios!


Raja i am really greatful for the reply and helping me to answer my question here.


Regards,

AJ.
post #6490 of 14918
Quote:
Originally Posted by Raja@ASUS View Post

1) Some PSUs don't like being used this way. Ground potential between units will be different (can cause havoc with current and safety sensing). There are some units out there that will even kill GPUs if they are run in tandem with other PSUs. We killed a Titan like this at an OC event.

2) There are no issues with the board power planes. We've had 4 cards under LN2 clocked high and CPUs running over 6GHz without problems.

3) PCIe training occurs at POST to map devices and de-skew any timing variance on signal lines. Initially I thought you were referring to POST issues - but re-read your post and realized you have issues under load. Almost certainly sounds like a PSU issue to me.

You probably need to debug number one properly. Not much I can suggest as it seems you have confined yourself to building or running a system that needs multiple PSUs - it's just not a good thing to do with some PSU combos (it's not good period for 24/7 systems really). Once you can debug that part you can start looking at if it's a board level fault (won't be power plane related).

Thanks for the insights. And sorry to pester you with questions. It is curious that if the problem is related to your first point, ground potential, it only shows up with 3 cards and not 2 on multiple PSUs. So to OC the 4 cards... how many PSUs were you running during that OC session? Two identical units? (I don't cryo-cool any more)

Would you suspect the, or any multiple PSU issue can minimized if i were to use 2 identical PSUs, which share a dedicated circuit and the same ground? I think this is a pretty important question since there are a bunch of folks here using multiple PSUs for their surround gaming rigs.

Frustrating since I did not experienced this problem with my p9x79-E WS, but it was loaded with watercooled titans (softmods only), not these WCd kingpins. (that was a very good mobo! sold it to a buddy when the R4BE came out guiltysmiley.gif)

thanks for the pointers.
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i7 5960X i7 6950X Asus Rampage V Extreme 10 2 GTX Titan X Pascal 
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8700K ASUS Maximus X Apex GTX 1080 2x8 GB G.Skill 4400c19 
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CPUCPUMotherboardGraphics
7740X 7980XE ASUS Rampage Vi Apex 2x Nvidia Titan Xp SLi 
RAMHard DriveHard DriveHard Drive
G.Skill 3600c15 2x8GB kits Samsung 960 Pro, NVMe WD Raptor 1T Plextor SSDs Raid 0 
Optical DriveCoolingOSOS
Plextor DVD/BR R/W (very) Custom Water Windows 10 Pro Windows 7 Pro 
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ASUS 144Hz Ducky Corsair 1500i Microcool Benchetto 101 
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Steelseries Rival Ultimate ears TF10s (IEMs) 
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i7 5960X i7 6950X Asus Rampage V Extreme 10 2 GTX Titan X Pascal 
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GSkill 3200c14 TZs 8x8GB @ 3400c13 Intel 750 NVMe 400GB 2x Plextor SSD 256 Raid 0 (Win 7) Samsung NVMe 950 Pro M.2 
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CoolingOSOSOS
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Seiki 50" 4K monitor (720P-2160i) 240-30Hz Das Keyboard Model S Pro Corsair AX1200 Case Labs SM8 
MouseAudio
Steelseries Rival Ultimate Ears TF10 
CPUMotherboardGraphicsRAM
8700K ASUS Maximus X Apex GTX 1080 2x8 GB G.Skill 4400c19 
Hard DriveCoolingOSCase
Samsung 960 Pro 360Rad + Chiller Win 10 HWBOT OBT 
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7740X 7980XE ASUS Rampage Vi Apex 2x Nvidia Titan Xp SLi 
RAMHard DriveHard DriveHard Drive
G.Skill 3600c15 2x8GB kits Samsung 960 Pro, NVMe WD Raptor 1T Plextor SSDs Raid 0 
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Plextor DVD/BR R/W (very) Custom Water Windows 10 Pro Windows 7 Pro 
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