Power Supply question (300W)

Braiden_1 · Oct 7, 2015

Hello,

I recently purchased a Nvidia GTx 750ti (2 GB) graphics card and I am going to use that card with my Nvidia GT 640 (3 GB). My question is, if I have a 300 Watt power supply could I be pushing its capabilities running two video cards? Here is my estimation of resource use based on specifications from the manufacturers. Based on this should I upgrade my Power Supply?

Hard drive = 10W
Mother Board = 50W
RAM =
Video Card 2 = 60W
Video Card 1 = 75W
Processor = 70W

265W's used without RAM in the equation

I have 16 GB of DDR3 ram in my computer and an Intel i5-3350P @ 3.10 GHz for the processor.

Thanks for your help!

noriel · Oct 7, 2015

I think its better if you use this tools to calculate power requirements http://www.coolermaster.outervision.com/PSUEngine2

Sergeant_Sneaky · Oct 7, 2015

Do you plan on using the two cards in SLI because you can't match different models, not for SLI anyway. I doubt the 300w PSU is a decent one, so it probably can't even push out a constant 300w, I wouldn't risk it myself.

pete_101 · Oct 7, 2015

What CPU do you have and is it overclocked, and make and model of the PSU?
I'm thinking it's not going to work as you will be close to 300W and you never want to run a PSU at it's max, especially if it's a cheaper model. But, if it turns out you have a good PSU and a low wattage CPU then you might just get away with it, still a new PSU would probably be a good idea.
BTW, you can't SLI those two cards.

hang-the-9 · Oct 7, 2015

300 watt PSU is about the lowest you would want to run a 750Ti on, without a second card. If you want both in there for some reason, you'd want a 400-450 good PSU.

Braiden_1 · Oct 8, 2015

pete_101 :

Okay so my Processor is an Intel i5-3350P @ 3.10 GHz not overclocked and my exact PSU is AcBel PSU - 350W peak, Model HBA008-ZA1GT. Apparently it has a 350W peak even though it oddly says 286.4W total wattage on the PSU itself...

Braiden_1 · Oct 8, 2015

Sergeant_Sneaky :

Yeah I know that I can't run SLI which sucks but wouldn't having two cards be better? If I wanted to run dual-monitors it should take the load off of the one video card I would think? I don't know I'm fairly new to how video cards work and perform. Just trying to improve the quality of gaming for myself.. Anyways my PSU is AcBel PSU - 350W peak, Model HBA008-ZA1GT ,

Braiden_1 · Oct 8, 2015

noriel :

Based on your recommended tool with just one video card being the Nvidia GTX 750ti, my recommended minimum Power Supply is 289W, cutting it close. However my PSU says that its peak wattage is 350W which is weird because it says 286W total. The model of my PSU is AcBel PSU - 350W peak, Model HBA008-ZA1GT . Thanks for your help!

DSzymborski · Oct 8, 2015

It's not weird that it lists peak wattage - listing peak instead of continuous is one of the classic red flags of a lousy PSU.

Braiden_1 · Oct 8, 2015

DSzymborski :

Okay so you're recommending that I get a better PSU? Do you have any recommendations on good brands?

pete_101 · Oct 8, 2015

Braiden_1 :

Get something like this http:// it's way better than what you've got but doesn't cost a fortune.

Sapphire Thunder · Oct 8, 2015

You would definitely want a 400-450W power supply. No matter if you run both video cards or not.
Also, by having the 2 gpus in, you are pretty much only wasting power.
dual monitor set-up doesn't really lower the performance of 750Ti at all.

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