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post #6271 of 22278
Hey guys I'm currently in process of building in my sth10 but I have a question regarding dual psu setups. I have a corsair hx750 to power the Cpu/mobo pumps hard drives and little things while my evga 1300w will be for my 4 290x. On my maximus vi extreme there's a 6 pin power connector for when you have 4 gpus. I was planning on using the corsair to power that connector but should I use the evga? I've heard it's bad to mix power from 2 different psu to the mobo so I just want to make sure before I start it up.
post #6272 of 22278
Quote:
Originally Posted by phallacy View Post

Hey guys I'm currently in process of building in my sth10 but I have a question regarding dual psu setups. I have a corsair hx750 to power the Cpu/mobo pumps hard drives and little things while my evga 1300w will be for my 4 290x. On my maximus vi extreme there's a 6 pin power connector for when you have 4 gpus. I was planning on using the corsair to power that connector but should I use the evga? I've heard it's bad to mix power from 2 different psu to the mobo so I just want to make sure before I start it up.

I'm currently doing a very similar thing w/ tri-titan. I use a Corsair 860 & EVGA 1300W. I use a device called Add2PSU which allows you to seamlessly bridge the two PSUs without any worries. If you have a bit of mechanical engineering know how you can make your own for slightly less, anyways... You want to power the extra 6 pin from the Corsair unit. You should only run the GPUs and other devices not hooked to the motherboard via the EVGA.
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post #6273 of 22278
Quote:
Originally Posted by skupples View Post

I'm currently doing a very similar thing w/ tri-titan. I use a Corsair 860 & EVGA 1300W. I use a device called Add2PSU which allows you to seamlessly bridge the two PSUs without any worries. If you have a bit of mechanical engineering know how you can make your own for slightly less, anyways... You want to power the extra 6 pin from the Corsair unit. You should only run the GPUs and other devices not hooked to the motherboard via the EVGA.

Cool thank you skupples. I actually bought the add2psu as well so I will be going the same route.


Also another question that may get a response here. I'm using a 4770k with a maximus vi extreme mobo. When all 4 gpus are in the header connectors are completely blocked by the 4th gpu and I could only get the power and reset in. Not the pled or hdd led. I think it's because the board is atx and not e atx. Anyone here using the m6e with 4 gpus, how were you if you were able to, get the headers connected? Posted this on the rog forums at Asus but no response yet
post #6274 of 22278
Quote:
Originally Posted by phallacy View Post

Hey guys I'm currently in process of building in my sth10 but I have a question regarding dual psu setups. I have a corsair hx750 to power the Cpu/mobo pumps hard drives and little things while my evga 1300w will be for my 4 290x. On my maximus vi extreme there's a 6 pin power connector for when you have 4 gpus. I was planning on using the corsair to power that connector but should I use the evga? I've heard it's bad to mix power from 2 different psu to the mobo so I just want to make sure before I start it up.

I'm using two Cooler Master V1000s w/ this jumper cable:




Your 1300w unit maybe pushed when you start cranking up the clocks. I would feel safer getting a 850-1000w unit to replace the 750w one. Use this new unit to power one card and your system and the 1300w unit to power on three 290X.


King4x4 is running quad 290Xs w/ dual Seasonic 1250w units. He recommended the jumper cable for my rig smile.gif.
post #6275 of 22278
those definitely work, add2psu is just a much more stable & safe solution.

I'm still trying to figure out how to stuff 2x PSUs in w/ 3x 480s... think i'm going to have to stuff one in the flex bays.
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post #6276 of 22278
Quote:
Originally Posted by wermad View Post

I'm using two Cooler Master V1000s w/ this jumper cable:




Your 1300w unit maybe pushed when you start cranking up the clocks. I would feel safer getting a 850-1000w unit to replace the 750w one. Use this new unit to power one card and your system and the 1300w unit to power on three 290X.


King4x4 is running quad 290Xs w/ dual Seasonic 1250w units. He recommended the jumper cable for my rig smile.gif.

Do you have a link for that jumper cable ? Also is there a difference between that and an add2psu (which I have) ? I was thinking the 750w might be pushed here is what it will be powering and if you guys can advise whether a step up to 1000w+ is necessary.

4770k (4.4ghz 1.38v)
M6E
4 x SSD
2 x HDD
1 x Blu Ray RW
2x d5 vario
1x swiftech mcp655
13 rad fans

The EVGA will power the 4 290x which are all overclocked in the 1200/1500 region with about +100mV each
post #6277 of 22278
Quote:
Originally Posted by phallacy View Post

Warning: Spoiler! (Click to show)
Do you have a link for that jumper cable ? Also is there a difference between that and an add2psu (which I have) ? I was thinking the 750w might be pushed here is what it will be powering and if you guys can advise whether a step up to 1000w+ is necessary.

4770k (4.4ghz 1.38v)
M6E
4 x SSD
2 x HDD
1 x Blu Ray RW
2x d5 vario
1x swiftech mcp655
13 rad fans

The EVGA will power the 4 290x which are all overclocked in the 1200/1500 region with about +100mV each

I'm running a 5.0 3930k, 2x DDC @ 100%, 32 fans, 2x HDD, 3x SSD all from a 860w & it barely pulls 600W w/ CPU under heavy load. The 750 should be fine for the motherboard/CPU. I would personally stick with the add2psu. The on board relay is what makes it a more stable solution.
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post #6278 of 22278
Quote:
Originally Posted by phallacy View Post

Do you have a link for that jumper cable ? Also is there a difference between that and an add2psu (which I have) ? I was thinking the 750w might be pushed here is what it will be powering and if you guys can advise whether a step up to 1000w+ is necessary.

4770k (4.4ghz 1.38v)
M6E
4 x SSD
2 x HDD
1 x Blu Ray RW
2x d5 vario
1x swiftech mcp655
13 rad fans

The EVGA will power the 4 290x which are all overclocked in the 1200/1500 region with about +100mV each

Four oc'd Hawaii on the 1300 EVGA is kinda of pushing it. Your system is perfectly fine on the 750 on its own. I would worry more about the EVGA since Hawaiis are power hungry (just like the old tahiti).

Best way to know is find out how much your drawing from the EVGA unit. A nice Kill-A-Watt can give you some perspective (at the wall).


Here's the jumper cable I'm using :

http://www.ebay.com/itm/24PIN-20-4-Dual-PSU-Multiple-Power-Supply-Adapter-33cm-Cable-Cord-/380855069302?pt=LH_DefaultDomain_0&hash=item58acbb2a76
post #6279 of 22278
Man , I cant believe I am having a hard time selling my M8. I might just turn it into a server.
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post #6280 of 22278
Quote:
Originally Posted by skupples View Post

I'm running a 5.0 3930k, 2x DDC @ 100%, 32 fans, 2x HDD, 3x SSD all from a 860w & it barely pulls 600W w/ CPU under heavy load. The 750 should be fine for the motherboard/CPU. I would personally stick with the add2psu. The on board relay is what makes it a more stable solution.

Thanks I should be good then : )

Quote:
Originally Posted by wermad View Post

Four oc'd Hawaii on the 1300 EVGA is kinda of pushing it. Your system is perfectly fine on the 750 on its own. I would worry more about the EVGA since Hawaiis are power hungry (just like the old tahiti).

Best way to know is find out how much your drawing from the EVGA unit. A nice Kill-A-Watt can give you some perspective (at the wall).


Here's the jumper cable I'm using :

http://www.ebay.com/itm/24PIN-20-4-Dual-PSU-Multiple-Power-Supply-Adapter-33cm-Cable-Cord-/380855069302?pt=LH_DefaultDomain_0&hash=item58acbb2a76


I do have a kill a watt and when I was using only the EVGA with a tri 290x setup it was pulling about 1050w from the wall during heaven / 3dmark11 benching and closer to 1100w after about an hour of Crysis 3. It's in the 290x thread somewhere if you're curious.

I think it should be ok, no? I believe the evga 1300w can sustain 1500w, obviously not ideal for any scenario but it's a champ in that regards. I'm guessing around 1150-1200w under extreme load for the 4 cards but won't know for sure until it's up and running.
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