Dual PSU and GTX 760 PhysX with 295x2

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BR34K

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May 15, 2014
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So... I just bought a 295x2 and because of this I have a spare 760. I also have a spare PSU. My question is then; can I combine these things? Running two PSUs and using the 500w psu to power the 760 as a physXcard? Is it safe/doable? Will my motherboard be able to handle it?


i7 4770k with Hyper Evo 212 Cooler
MSI x87 g45-Gaming MB
Samsung SSD 840 EVO 250GB BK OEM
Seagate Barracuda 1 TB 7200 RPM HDD
Corsair RM850 80+ Gold PSU
Corsair CX 500W PSU

Correct me if I have completely misunderstood how physx works.
 
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Hybrid PhysX (AMD primary + Nvidia dedicated to PhysX) no longer works and has been locked out at the driver level.

Your other problem is that a single 850 watt PSU is not enough for the 295x2 + GTX 760. Not sure how dual PSUs would work, but your barriers are multiple.

Too bad, because the Witcher 3 with PhysX is looking awesome.
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BR34K

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May 15, 2014
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May I ask why? I see this being completely obsolete at the time, but when witcher 3 enbs come out, then this might be relevant.

How would it make the system unstable? That's what I'd like to know.

Appreciate the help by the way.
 
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Eximo

Eximo

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May 27, 2010
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You completely misunderstand how PhysX works. PhysX is a software option that will only run on Nvidia cards and only on games that have PhysX. If your ATI card is running the game, there is no data being sent to the Nvidia.

You can have all the cards you want installed, but you have to pick which ones run what games. You can't use them simultaneously. (Somewhat common practice for professionals is to have one gaming card and one workstation class GPU) Or an Nvidia card for CUDA capable programs and a ATI card for applications that support it.

A 295X2 will pretty much take care of in game physics with brute force. It is the single fastest card you can get right now that doesn't cost $3000.
 
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danicj

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Sep 15, 2014
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You could do it but its not supported. Google Hybrid Physx for some solutions, most are out dated and only work on older physx titles. Not many titles use physx anyway. I really don't recommend it. Your CPU is very capable at handling physx calculations, so if you could make hybrid physx work a 760 would not boot your performance much.

I bet your 850watt power supply could handle 295x2 and 760 just fine. I have the same PSU and 2 x 290x work just fine. They do make adapters to power on two PSUs, search for dual psu adapter and you should be able to find something. Again I wouldn't recommend it, bigger PSU better than 2 working together.
 
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k1114

k1114

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May 2, 2010
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I assume you know there are extra steps to take to get a physx card to work with amd. And also it only works for games before physx 3.0. Other than issues associated with that, having 2 psus isn't recommended but there shouldn't be other issues.

@legend, Nothing but drivers has been the issue of them conflicting; settings, timings, etc. is completely irrelevant. But drivers conflicting hasn't been the case for many years now.

@eximo, The 295x2 will not take care of physics with brute force. If the game uses physx, it's done by the cpu without a nvidia card.
 
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Rationale

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No. PhysX will cripple any system using an R9 295, simply because it doesn't support Cuda acceleration and therefore the PhysX will be offloaded to the CPU. While on the CPU, heavy PhysX will universally cause a CPU bottleneck.

Having said that, there is no reliable way to get an Nvidia card and an AMD card working together.
 
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17seconds

17seconds

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Jul 27, 2010
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Hybrid PhysX (AMD primary + Nvidia dedicated to PhysX) no longer works and has been locked out at the driver level.

Your other problem is that a single 850 watt PSU is not enough for the 295x2 + GTX 760. Not sure how dual PSUs would work, but your barriers are multiple.

Too bad, because the Witcher 3 with PhysX is looking awesome.
 
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