GPU and PSU question GTX 750Ti on 300W

doksy08

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Sep 21, 2016
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I'm planning on upgrading to an MSI GTX750Ti TwinFrozrGaming GDDR5 2GB 128Bit Nvidia GeForce DX11.2 gpu and i wanted to know if my 300W psu can handle it. Some people i asked said it can and some people said i needed a 550W psu.

My specs (it's a prebuilt pc)

Asus m81m-k motherboard
HK400-51 AN 300W psu
i7 4770 cpu
HD 8350 current gpu

just in case i'll link the gpu i'm planning to buy however it is in my native tongue.

http://www.vatanbilgisayar.com/msi-gtx750-ti-twinfrozrgaming-gddr5-2gb-128bit-nvidia-geforce-dx112-ekran-karti.html#genel-bakis

Thanks in advance.
 

Barty1884

Retired Moderator
A lot of PSU calculators overestimate, sometimes by a long way.

There;s no way you'd need 339W. For long-term use, having some extra headroom (like a quality 400W PSU) is definitely nice, but in real-world use, with low power components like you're proposing, you'll be fine in the short-term.

Again, I'd recommend upgrading the PSU as soon as you can afford it, but you're not going to fry anything in the meantime (run the GPU at stock speeds though, no overclocking it - just to be sure).

Something like this is a quality upgrade:
https://pcpartpicker.com/product/4Vzv6h/seasonic-power-supply-s12ii430b
$40.

The CX450 V.2 from Corsair is a decent option too, but costs more than the SeaSonic unit - and it's a little lesser quality.
https://pcpartpicker.com/product/FQ648d/corsair-power-supply-cp9020101na
 

Barty1884

Retired Moderator
It's going to be close on a 300W PSU, but I suspect it'll work fine.

The HD8350 is a 20W GPU, whereas the 750TI is a 60W.

I'd expect your existing setup to be pulling around 175W at absolute max load, removing the 8350 and adding a 750TI would push that to around 205-210W (theoretical max).

You never actually push all your components to their theoretical max, so you'd likely only pull around 175W in 'normal' circumstances.

That PSU is a HuntKey but, beyond that I can find no more info.

Again, I wouldn't expect many issues. It should work just fine.

Regardless, you'd never need a 550W PSU for a 750TI build - that's absurd. A quality 350-400W PSU would have no problems at all.
 

doksy08

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I can post a picture of it, if it would help ? http://imgur.com/a/5RGQQ here it is.
 

doksy08

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Sep 21, 2016
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I don't have much money at the moment so i'd rather not risk frying my pc. I'd rather wait till i can afford a better psu at around $50 to go with the gtx750ti then fry it. Would even trying to plug it in pose any threat ?
 

Barty1884

Retired Moderator
I can't see it posing any significant thread in all honesty. You're not going to be drawing anywhere near the max power of the 12V rail (19A x 12V = 228W) in common use, probably only 175W tops.

Replacing it is probably a good idea in the medium/long term, but I wouldn't anticipate any issues using it in the meantime.
 

doksy08

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Sep 21, 2016
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I was just sceptical because on Power Supply Generator when i calculated it sait i'd need 339 Watts of psu when i chose the GTX750Ti. I'm just being very cautious as i can't afford to fry my computer at the moment. Since i game a lot and my pc is on for like 10-15 hours on my free days i really just want to confirm before i purchase the GPU.

Thanks for your input and help !
 

Barty1884

Retired Moderator
A lot of PSU calculators overestimate, sometimes by a long way.

There;s no way you'd need 339W. For long-term use, having some extra headroom (like a quality 400W PSU) is definitely nice, but in real-world use, with low power components like you're proposing, you'll be fine in the short-term.

Again, I'd recommend upgrading the PSU as soon as you can afford it, but you're not going to fry anything in the meantime (run the GPU at stock speeds though, no overclocking it - just to be sure).

Something like this is a quality upgrade:
https://pcpartpicker.com/product/4Vzv6h/seasonic-power-supply-s12ii430b
$40.

The CX450 V.2 from Corsair is a decent option too, but costs more than the SeaSonic unit - and it's a little lesser quality.
https://pcpartpicker.com/product/FQ648d/corsair-power-supply-cp9020101na
 

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