750w Power Supply, is it enough for my setup? and can I add a dedicated PhysX card?

Nex Cube · Mar 22, 2016

Hello everybody. Just now registered with the site and had a quick question about my current hardware setup. This is my rig:

Z87X-UD5H Motherboard
i5 4670k CPU
EVGA GTX 980 Ti Classified
16gb DDR3 1866MHz
SSD 1TB Samsung
Blu Ray RW Drive

All of that is being powered by an Antec Earthwatts 750W power supply. Is that enough for that? I mean, it's worked so far... I would assume if it wasn't enough it just wouldn't have worked at all. Not positive on that though or if I could be seeing any performance hits by not having enough power to draw from. I've had the PSU for a bit and have been upgrading the other components of my PC just assuming I had enough power.

Now I'm having issues, even with my pretty substantial machine, with PhysX in games, so I would like to add my GTX 770 that I replaced back to my PC as a dedicated PhysX card. Do you guys think my PSU could handle that, or would I need to upgrade to something a little more if I wanted to do that? and if so, how much do I need? Thanks for your time guys, and I'm sorry if I left out any important information... let me know and I'll get back ASAP. Thanks again.

Mr Kagouris · Mar 22, 2016

750W is enough for your current setup and could probably support the 770 as well. However the 980 Ti should be able to handle any amount of PhysX you throw at it.

clutchc · Mar 22, 2016

Yes, the Antec 750W will support both cards easily.

HFC · Mar 22, 2016

Ditto. You can also confirm with a number of online tools that will let you enter your components and tell you the minimum necessary power supply. Just google "power supply calculator."

Nex Cube · Mar 22, 2016

Thanks for all the help guys. I've since put it in and everything seems to be working great for the most part. I would actually think the 980 ti would be plenty to handle whatever PhysX I could throw at it as well, but I was having trouble with it on high on borderlands 2... a game I should not be having any issues with at all. I would be at a steady 60 frames but it would drop to the 40's and even upper 30's when enemies showed up. It would noticeably slow down so I decided to turn on the steam fps counter... Since adding my 770 back as a dedicated PhysX card it seems to not be having that issue at all anymore. However, I have another concern now. My 980 ti has always been plugged into my 16x slot of my motherboard and has been running on that, but I just put my 770 in my 8x slot and checked it on gpu Z and my 980 ti is now running at 8x 3. Will this hurt my performance at all? And if so, will putting my 770 in my 4x slot make a difference? Thanks again guys.

Mr Kagouris · Mar 23, 2016

No it won't hurt your performance at all. GPUs only start losing performance from 4x and lower, and nvidia GPUs will simply not turn on if they aren't connected to 8x or higher.

clutchc · Mar 23, 2016

+1^
On some boards, any time you populate the 2nd PCIe x16 slot it will share bandwidth with the other slot. But PCIe @ 8 lanes is still more than the card can saturate at version 3. https://www.pugetsystems.com/labs/articles/Impact-of-PCI-E-Speed-on-Gaming-Performance-518/

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750w Power Supply, is it enough for my setup? and can I add a dedicated PhysX card?

Nex Cube

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Mr Kagouris

Mr Kagouris

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clutchc

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HFC

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Nex Cube

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Mr Kagouris

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clutchc

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