Is my PSU strong enough?

[Milos_10]

Im planning on buying i5 2400 and GTX 750ti
Will my 400(or 450 im not sure) PSU be enough for everything to run smoothly?

 

[Karadjgne]

Very much so. You can run a 750ti on a 300w psu.

 

[Milos_10]

Yeah but im more worried about the quad core CPU.Im not sure is it 400w or 450w ,i will tell by tomorrow.

 

[Karadjgne]

Your whole pc runs on less than 300w. When it's referred to gpu needs, the pc is taken into consideration. Most pc's run max around 200w ish, the only component that draws a major amount of power is the gpu. So when, for instance,its referring to a gtx1080 needing a minimum of a 550w psu it's really meaning that it's 200w for the pc, and an additional 350w for the gpu. Reality is that the gpu will in no way pull that 350w draw, probably only half that and most times the pc will not pull the full 200w, closer to half that as well, so that 550w psu is only seeing @250-300w. This puts it at running at a little over 50% capacity which is the perfect area for the highest efficiency as well as being in the best area for cooling and output. Running a psu at maximum for any length of time runs the risk of overheating, for some under quality psus it means risk of overloading and there's no room for errors.
The 750ti can run on a 300w psu, but it's preferred for a 400-450w, simply so everything has enough power, and if some part suddenly demands more there's extra to spare if needed.

Go with which ever is the better psu. Quality counts. And bigger doesn't necessarily mean better.

 

[Milos_10]

I will upgrade in the future but i cand afford PSU right now.So ur telling me that my PC will run or 450PSU but its better if i upgrade in the future?

 

[Milos_10]

Your whole pc runs on less than 300w. When it's referred to gpu needs, the pc is taken into consideration. Most pc's run max around 200w ish, the only component that draws a major amount of power is the gpu. So when, for instance,its referring to a gtx1080 needing a minimum of a 550w psu it's really meaning that it's 200w for the pc, and an additional 350w for the gpu. Reality is that the gpu will in no way pull that 350w draw, probably only half that and most times the pc will not pull the full 200w, closer to half that as well, so that 550w psu is only seeing @250-300w. This puts it at running at a little over 50% capacity which is the perfect area for the highest efficiency as well as being in the best area for cooling and output. Running a psu at maximum for any length of time runs the risk of overheating, for some under quality psus it means risk of overloading and there's no room for errors.
The 750ti can run on a 300w psu, but it's preferred for a 400-450w, simply so everything has enough power, and if some part suddenly demands more there's extra to spare if needed.

Go with which ever is the better psu. Quality counts. And bigger doesn't necessarily mean better.

And my current GPU is GIGABYTE's AMD Radeon HD 6670 ,and it has same wattage requirments as the GTX 750ti that im planning on buying.Also my CPU has TPD of 65W and i5 that im planning on buying has TDP of 95?

 

[Karadjgne]

No. If you have a 450w psu, that's good enough to run a 750ti,or a 950 or even a 1050 or 1050ti, all of which in this market are about the same price, but the 1050ti is by far the best. You don't need an upgrade psu. Your pc is fine as is with any of those 4 gpus.

 

[Milos_10]

Ok ,thanks!

 

[Karadjgne]

TDP is the Thermal Design Power. What that means is that it'll generate (for your current gpu) 65w worth of heat and the cooling heatsink and fans are rated to cool 65w of heat. Kinda like a hairdryer is rated at 1500w, it doesn't necessarily mean that it pulls 1500w from the wall, but stick your hand over the end and you'll feel what 1500w of heat will do.

Actual power consumption at maximum load is only 60-65w for a 750ti and about 70w for a gtx1050ti with average gaming loads being approximately half that draw.

So when gaming the nastiest, hardest, most intense game you own, you'll be looking at total system draws of 200-225w on average, and benchmark software might pull 275w. That's easy for a 400-450w psu.

 

[Milos_10]

Thanks man