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[Official] AMD R9 290X / 290 Owners Club - Page 1537

post #15361 of 43950
Quote:
Originally Posted by Redvineal View Post

Question for you smart power supply folks...

I'm set to receive my 2nd and 3rd R9 290's on Friday. As I mentioned in previous posts, I have a Corsair AX860 PSU that can handle 2 cards for a while. In order to power the 3rd card, I'm considering using an older 850 PSU I have lying around.

Is it safe for me to use PCIe power connectors from 1 PSU on 2 cards, and PCIe power connectors from a second PSU to power the 3rd card?

I've seen builds with dual PSUs, but not sure about the risks and considerations involved.

(edit: btw, this is all just a temporary solution until I can find a nice high output PSU in stock somewhere)

Thanks!

Anyone? I hate to bump, but I can't seem to find any good info about what I'd like to do...
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post #15362 of 43950
Quote:
Originally Posted by Redvineal View Post

Anyone? I hate to bump, but I can't seem to find any good info about what I'd like to do...

You could run all 3 cards on the 860 but only if you leave your whole system on stock

After you get a bigger PSU you can go nuts

Or you could ghetto rig that TX850 into your system
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post #15363 of 43950
Quote:
Originally Posted by shilka View Post

You could run all 3 cards on the 860 but only if you leave your whole system on stock

After you get a bigger PSU you can go nuts

Or you could ghetto rig that TX850 into your system

My single card system right now on full load uses about 430-440W at stock. Adding two cards will probably bust the AX860 easily.

I don't mind the ghetto rig for a few days/weeks. I just need to know if I can safely jump the TX850 and use only its PCIe connectors on 1 or 2 cards. Just to supplement the power. Mainly, I'm concerned that I'm not considering something with the ghetto rig which could cause GPU failure, fire, or whatever else is worse than those!

Has anyone tried this before? Am I the first around here to come up with such an idea?

Every OC post I've read about dual PSU's were people wanting to use 2x1200W units or something crazy like that. The only responses were "man, that's overkill, save your money" type responses.
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post #15364 of 43950
Quote:
Originally Posted by ryboto View Post

Question regarding power supplies- If my system, under load using Crysis 3, BF4, 3dmark/11 never draws more than ~420W from the wall, I can get away with a 550W PSU, correct? I am considering upgrading the PSU in my SG08 to an S12G-550. I was considering the 650, but with the lack of space in the case and extra cables the higher power unit comes with, I'd rather drop to the 550W.

For reference, the 600W PSU in the Silverstone is 80Plus Bronze rated. Trouble with it is the low 12v, drops to 11.4V under load. Unless GPU-Z shouldn't be trusted for 12v monitoring?


You can't trust any of the voltage monitor software, if you want a precise measurement of voltage you would need a multi-meter. heck I got Asus Probe Utility installed and it says my 12v drops to 0.12v and at that voltage my system should have crashed, LOL Heck it even says my CPU voltage goes as low as 0.05v LOLOL


They generally just give you an idea on how much voltage you are using but not the exact amount.
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post #15365 of 43950
Quote:
Originally Posted by esqueue View Post

Don't let a watercooling setup trick you into thinking that they aren't putting out lots of heat either. It's putting out the same amount of heat. Just with more air flow over a wide area makes it feel cooler in a when you put your hand in front of the fans.

My brief experience with wasting money and time mining made the radiator actually get pretty warm. A pontiac heater core. When you step into the room after it's been running for a while you DEFINITELY know that it is putting out lots of heat. Also my power supply fan going haywire is another indication that it is working hard.

I dunno - i think with better cooling the heat is let off more slowly letting the surroundings dissipate it easier, may not even get as hot to begin with (since itll be more electrically efficient due to better cooling) - i have a spare bedroom that houses my pc, and when the 290X had the reference cooler it was noticeably hotter in there than with my gelid.

It was like a damned hair dryer, pretty hot when i opened the door after a long gaming session - i remember being shocked at how much cooler it was with the gelid. Dont think ambient temps changed too much those 2 weeks.
post #15366 of 43950
Quote:
Originally Posted by Redvineal View Post

My single card system right now on full load uses about 430-440W at stock. Adding two cards will probably bust the AX860 easily.

I don't mind the ghetto rig for a few days/weeks. I just need to know if I can safely jump the TX850 and use only its PCIe connectors on 1 or 2 cards. Just to supplement the power. Mainly, I'm concerned that I'm not considering something with the ghetto rig which could cause GPU failure, fire, or whatever else is worse than those!

Has anyone tried this before? Am I the first around here to come up with such an idea?

Every OC post I've read about dual PSU's were people wanting to use 2x1200W units or something crazy like that. The only responses were "man, that's overkill, save your money" type responses.

Yes, you can run two PSUs like that to spread the load. They sell adapter things so that the second one comes on with the first also, should be able to find one at FrozenCPU or Performance PCs, somewhere like that, but I can't remember the name of the adapter thing off-hand.
post #15367 of 43950
ADD2PSU
post #15368 of 43950
Quote:
Originally Posted by jerrolds View Post

I dunno - i think with better cooling the heat is let off more slowly letting the surroundings dissipate it easier, may not even get as hot to begin with (since itll be more electrically efficient due to better cooling) - i have a spare bedroom that houses my pc, and when the 290X had the reference cooler it was noticeably hotter in there than with my gelid.

It was like a damned hair dryer, pretty hot when i opened the door after a long gaming session - i remember being shocked at how much cooler it was with the gelid. Dont think ambient temps changed too much those 2 weeks.

I understand what you say about being efficient thus wasting less energy in heat but it not by much and the room will still get hot. I've never ran the card very hard on air but my room did get hot as hell when I mined. Actually just turned off folding@home as the room was getting too hot.
post #15369 of 43950
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post #15370 of 43950
Quote:
Originally Posted by jerrolds View Post

I dunno - i think with better cooling the heat is let off more slowly letting the surroundings dissipate it easier, may not even get as hot to begin with (since itll be more electrically efficient due to better cooling) - i have a spare bedroom that houses my pc, and when the 290X had the reference cooler it was noticeably hotter in there than with my gelid.

It was like a damned hair dryer, pretty hot when i opened the door after a long gaming session - i remember being shocked at how much cooler it was with the gelid. Dont think ambient temps changed too much those 2 weeks.

There will be a minute difference in the amount of heat released between the two, most likely in favor of the water cooling setup.. which, depending on the amount of water, may be holding quite a bit of hear, while the small air heatsink.. though scorching hot to the touch, isnt really that much energy.

And there is a good 10-30w difference from a cool to hot GPU, I've found.. but the pump will negate most of those power savings.
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