Topic Title: 295x2 PSU Rail Issue
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Created On: 07/09/2014 04:23 PM
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 07/09/2014 04:23 PM
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Hapatingjaky
Peon

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Sup all,

 

Still battling the stutter issue from my previous thread but am having another issue in regards to power. Bought a new water cooling unit, and ripped the entire system apart last weekend to re-install everything. Also to make sure that the Enermax MaXRevo 1500watt is correctly wired to he devices and to make sure everything was connected properly and not over volting on any rails. This us the rail layout I have for the PSU

 

 

Rail 1 & 2 - Motherboard CPU/Ram

Rail 3 - MSI R290x Gamer Edition OC + 8pin 12v motherboad adapter

Rail 4 - 9x Corsair 120 High Performance, Swiftech Pump, LED for the resevoir, Motherboard PCIE Power Connector for extra power, 2x OCZ Vector 250GB SSD's.

Rail 5 & 6 - R295x2

 

Now I still get the microstutter and for some reason it is alot worse now. In Diablo 3 I can hear lot of rail noise and then the rail noise will disappear for a few seconds, DIablo 3 will drop to 20FPS and then the rail noise will come back and the game is somewhat playable reading 60FPS but feel like 30 to 40.

 

Can anyone give me a better recommendation on how I should have everything plugged? Maybe try a relieve the rail noise and microstutter. I am Overclocking the CPU to 4.8GHz at 1.275v but had this same setup with the TRI SLI Windforce 780's and had no rail noise or microsttutter issue.

 



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Intel Core i7 4770K @ 4.8GHz/Uncore, Asus Maximus VI Extreme, GSKILL 16GB DDR3 2400MHz CAS9, Asus R295x2 + MSI Gaming R290x OC, Creative Labs Soundblaster Z, OCZ Vector 512GB Raid 0, Enermax MaxRevo 1500w, SilverStone Temjin TJ11, Windows 8.1 Pro

 07/09/2014 05:41 PM
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HoneyBadger84
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Other than suggesting you try to spread the GPUs across 3-4 rails (the 295x2 should be spread across 2 rails, so should the 290, and you shouldn't overlap them) for ideal power in terms of what they can draw from... I can't really say much outside of that, not familiar with this PSU.



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CPU: i7 3930k @ 4.6GHz 1.29V (Corsair H110-cooled) ~ Motherboard: Asus RoG Rampage IV Extreme 
RAM: G.Skill Sniper Gaming Series (4x4GB 2133MHz, CL9) ~ PSU: Corsair AX 1200W ~ Case: Enermax Fulmo GT
GPUs: 3x HIS R9 290X Reference (Core) Editions in TriFire, Max Load Temps: 71C/70C/71C during OC testing :-P

 07/09/2014 06:30 PM
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Hapatingjaky
Peon

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Originally posted by: HoneyBadger84 Other than suggesting you try to spread the GPUs across 3-4 rails (the 295x2 should be spread across 2 rails, so should the 290, and you shouldn't overlap them) for ideal power in terms of what they can draw from... I can't really say much outside of that, not familiar with this PSU.

 

 

Yes but currently I have the 295x2 on its own sharing nothing, the 290x is sharing the 8 pin 12v motherboard adapter. Every other device is on number 4.

 

The biggest issue with this is the fact that AMD recommends this PSU to be used with dual 295x2 and I can not see how that is possible without overlapping.

WHat I can do is split the 290x on 3 & 4 with it sharing the 8pin 12v and 6pin PCI-E port for the motherboard with some fans, then split some more fans with the pump, and SSD's on 5 shared with the 295x2?



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Intel Core i7 4770K @ 4.8GHz/Uncore, Asus Maximus VI Extreme, GSKILL 16GB DDR3 2400MHz CAS9, Asus R295x2 + MSI Gaming R290x OC, Creative Labs Soundblaster Z, OCZ Vector 512GB Raid 0, Enermax MaxRevo 1500w, SilverStone Temjin TJ11, Windows 8.1 Pro

 07/11/2014 12:33 PM
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Thanny
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This is why I abhor multi-rail PSU's. 

The biggest problem I see with your setup is that you're sharing a single 30A rail between a 290X and the EPS12V connector.  The latter provides pretty much all power to the CPU.  You need to put those two things on separate rails.

 

 07/11/2014 02:54 PM
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black_zion
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And that's the reason SeaSonic dumped multi-rail PSUs as soon as the ATX specification removed the 18 amp limit.

Also remember that several reputable review sites show the 295x2 draws a large chunk of its power through the PCIe slot itself (much more than 75w), and that is supplied via the ATX24 connection.

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ASUS Sabertooth 990FX/Gen3 R2, FX-8350 w/ Corsair H60, 8 GiB G.SKILL RipjawsX DDR3-2133, XFX HD 7970 Ghz, 512GB Vertex 4, 256GB Vector, 240GB Agility 3, Creative X-Fi Titanium w/ Creative Gigaworks S750, SeaSonic X750, HP ZR2440w, Win 7 Ultimate x64
 07/12/2014 12:51 AM
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Thanny
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I've read the exact opposite - that it takes very little power from the slot itself.

 07/12/2014 01:15 AM
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black_zion
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I read it wrong, it pulls most of its power via the PCIe slot at idle, which amounts to only about 25w, under load it's mostly via the PCIe connectors.

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ASUS Sabertooth 990FX/Gen3 R2, FX-8350 w/ Corsair H60, 8 GiB G.SKILL RipjawsX DDR3-2133, XFX HD 7970 Ghz, 512GB Vertex 4, 256GB Vector, 240GB Agility 3, Creative X-Fi Titanium w/ Creative Gigaworks S750, SeaSonic X750, HP ZR2440w, Win 7 Ultimate x64
 07/12/2014 05:43 AM
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Hapatingjaky
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Then technically this PSU is not capable of running even dual 295x2's even with the fact AMD recommends it for that feature.

 

Anyways I've redone all the cabling, splitting it like I said but still running in to issues with annoying stuttering at both 1600p and 4k, something I never had with a single 780, 780SLI or 780 TRI-SLI. Did some tests tonight by seeing if removing the Soundblast Z would fix it and it didn't. Installed Afterburner and RivaTuner to use  the overlay found out that Diablo 3 dosen't even use GPU 2 and 3 at all unless a real huge batter is going on and even then its low. World Of Warcraft is the same. SLI/TRI-SLI scales well though.

 

Might try different PCI-E slots and see what happens, right now I have the 295x2 in PCIE-1 and the 290 in PCIE-4.



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Intel Core i7 4770K @ 4.8GHz/Uncore, Asus Maximus VI Extreme, GSKILL 16GB DDR3 2400MHz CAS9, Asus R295x2 + MSI Gaming R290x OC, Creative Labs Soundblaster Z, OCZ Vector 512GB Raid 0, Enermax MaxRevo 1500w, SilverStone Temjin TJ11, Windows 8.1 Pro

 07/12/2014 01:40 PM
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Hapatingjaky
Peon

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For the system I am using, how would an EVGA Supernova 1300 G2 fair? 108A in the 12 rail?



-------------------------

Intel Core i7 4770K @ 4.8GHz/Uncore, Asus Maximus VI Extreme, GSKILL 16GB DDR3 2400MHz CAS9, Asus R295x2 + MSI Gaming R290x OC, Creative Labs Soundblaster Z, OCZ Vector 512GB Raid 0, Enermax MaxRevo 1500w, SilverStone Temjin TJ11, Windows 8.1 Pro

 07/12/2014 04:20 PM
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black_zion
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I would suggest the Corsair AXi AX1200i instead.

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ASUS Sabertooth 990FX/Gen3 R2, FX-8350 w/ Corsair H60, 8 GiB G.SKILL RipjawsX DDR3-2133, XFX HD 7970 Ghz, 512GB Vertex 4, 256GB Vector, 240GB Agility 3, Creative X-Fi Titanium w/ Creative Gigaworks S750, SeaSonic X750, HP ZR2440w, Win 7 Ultimate x64
 07/12/2014 06:31 PM
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Hapatingjaky
Peon

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Originally posted by: black_zion I would suggest the Corsair AXi AX1200i instead.

 

Are you sure that will be enought to power my system, 10x120MM Fans ( including the one on the 295x2, a 290x, 16GB DDR 2400MHz @1.65v, a core i7 4770K running at 4.8 on 1.275v, 2x180MM ( original case fans from silverstone ) and everything else?



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Intel Core i7 4770K @ 4.8GHz/Uncore, Asus Maximus VI Extreme, GSKILL 16GB DDR3 2400MHz CAS9, Asus R295x2 + MSI Gaming R290x OC, Creative Labs Soundblaster Z, OCZ Vector 512GB Raid 0, Enermax MaxRevo 1500w, SilverStone Temjin TJ11, Windows 8.1 Pro

 07/12/2014 08:06 PM
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black_zion
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500w for the 295x2, 290w for the 290x, 200w for the processor and cooling, 150w for the rest of your system, comes out to 1140w, and that's worst case scenario of everything loaded to 100%, which in reality it won't be.

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ASUS Sabertooth 990FX/Gen3 R2, FX-8350 w/ Corsair H60, 8 GiB G.SKILL RipjawsX DDR3-2133, XFX HD 7970 Ghz, 512GB Vertex 4, 256GB Vector, 240GB Agility 3, Creative X-Fi Titanium w/ Creative Gigaworks S750, SeaSonic X750, HP ZR2440w, Win 7 Ultimate x64
 07/12/2014 08:27 PM
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Hapatingjaky
Peon

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The 295x2 uses 730Watts as per every review while gaming though?



-------------------------

Intel Core i7 4770K @ 4.8GHz/Uncore, Asus Maximus VI Extreme, GSKILL 16GB DDR3 2400MHz CAS9, Asus R295x2 + MSI Gaming R290x OC, Creative Labs Soundblaster Z, OCZ Vector 512GB Raid 0, Enermax MaxRevo 1500w, SilverStone Temjin TJ11, Windows 8.1 Pro

 07/12/2014 09:48 PM
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black_zion
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No, that's total system power, and a heavily overclocked and overvolted i7 with liquid cooling, and the motherboard itself with RAM pulls a bit.

-------------------------
ASUS Sabertooth 990FX/Gen3 R2, FX-8350 w/ Corsair H60, 8 GiB G.SKILL RipjawsX DDR3-2133, XFX HD 7970 Ghz, 512GB Vertex 4, 256GB Vector, 240GB Agility 3, Creative X-Fi Titanium w/ Creative Gigaworks S750, SeaSonic X750, HP ZR2440w, Win 7 Ultimate x64
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