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exactly. And the question was if the wattage is enough. Yes it is. Not if the PSU would be garbage.
https://www.guru3d.com/articles-pages/gigabyte-geforce-gtx-970-oc-mini-itx-review,7.html
do you know why they recommend this? Have you also seen in the test how much wattage their entire test PC with an i7-5960X and the GTX 970 consumed in total?
Since we know the OP is using a certain GPU, even then nothing in the Core i5 or Core i7 line meant for Desktop PC use should be on anything less than a 500Watt powersupply if the PC is meant for gaming. By having the PSU at 450Watts the OP effectively kills what little upgrade path they have left. Tha is the prebuilt trying to make a user maintain a warranty that will probably never be needed in the first place.
Yes an i5-3470 it is his entry psot.
And as hitn the i7-5960X uses mroe pwoer then his CPU and they pulled 249W from the wall which emans with power efficency of the PSU it is actually even at least 20% lower where we come more to a pwoer consumption of aroudn 200W.
"Here is Guru3D's power supply recommendation:
GeForce GTX 970 or 980 - On your average system the card requires you to have a 500 Watt power supply unit."
I can't know for sure what they were thinking, but they're probably taking into account the differences of various PC builds : CPU type, PSU efficiency, no. of other devices attached etc. And they take a margin on the safe side.
Yes an i5-3470 it is his entry psot.
And as hitn the i7-5960X uses mroe pwoer then his CPU and they pulled 249W from the wall which emans with power efficency of the PSU it is actually even at least 20% lower where we come more to a pwoer consumption of aroudn 200W. [/quote]
I checked...made the edit., you messed up the edit on your quote.
SO if the OP decides to get a K series i7 in the Sandybridege line as an upgrade, they also have to upgrad their PSU? Best justy to prepare for it now than spend more later.
Which is why we should be going by the recommendations of the manufacturers when purchasing a PSU.
No they do it to sit betetr in the pwoer efficency curve, to have more headroom and upgradability of a system. The thign is, if they say that 300W is actually enough as they used less, it means they can be sued if it isnt. Besides qualtiy PSU's start around 500-550W. Has nothign to do with wattage requirement itself.
No because they still have way more wattage then the PC will consume. the i7-5960X is a HEDT which consumes mroe power then any K CPU. And if that only draw 250W out of the wall (means ~200W from the PSU) then even a 9900K wont be able to draw 250W more.
But befor you take a Sandybridge i7 (2700K) I would look inty Ivy Bridge (3770K) which has a TDp of 77W while the i7-5960X is a 140W TDP CPU. ANd that doesnt even mean the actual wattage consumption (which is lower) as the TDP wattage is not only depending on the power wattage consumed but also mechanical heat (you can proove it with a fixed voltage. A CPU under laod becomes hotter at same pwoer draw with a fixed voltage).
The prove is written there right there. If you can explain logical how 450W PSU is not sufficient to provide 150W under full load then we could stop doing a senseless arguing.
@OP:
The simple answer is it will work, but it is not he best idea (or recommended) to go with a 450Watt PSU for various reasons. A 500Watt or more PSU will allow you further upgrade room in the future for a new CPU and a new RAM kit to get you to 16GB system RAM.
A GTX970 is not going to bottleneck any of the Core i5 or core i7's in the Sandybridge generation of IntelCPU's, so upgrading the CPU and RAM should be preceded by using a PSU that is capable of being future proof. Heck, if you get a 650Watt PSU, you will be able to save/allocate spending elsewhere on the next build and just use the 650Watt PSU for it in stead of having to buy a new one.
You have do learn what manufacturer recommendations are made of and guru3d is not the manufacturer lol...
Stop grasping to last straw by saying a specific test is biased that only makes your opinion biased and unreliable.
Manufacturer for the OP's GPU is NVIDIA. They recommend that people use a 500Watt PSU or better for it due to various hardware types.
https://www.nvidia.com/content/geforce-gtx/GTX_970_User_Guide.pdf
pn page 7 of 31 in that PDF:
Minimum System Requirements
PCI Express 3.0-compliant motherboard
with one dual-width x16 graphics slot.
System Power Supply
Minimum 500 W or greater system power supply with two 6-pin
PCI Express supplementary power connectors.
Operating System
Microsoft Windows 8, 32-bit or 64-bit
Microsoft Windows 7, 32-bit or 64-bit
Linux, 32-bit or 64-bit
Manufacturer recommendations are not actual requirements. As all the test on the internet shows 450W is way more then you need aswell as every Pre-build.
But of course as the manufacturer recommendation is right, all the pre-builds and test are fake news and every Pre-build owner that runs a GTX 970 on 450W are only infantry playing on their PC as the PC don't actually run because they not fulfilling the manufacturers recommendations.
Even under full load, the system's power requirements would be below those 450W in question. No problem here. But...What if you have some power spikes ? Some component (or more at the same time) draws more current. Faults, maybe. Shorted boards, for whatever reason. Then you have:
1. Good power supply - cuts power to the system, shots everything down;
2. Bad/cheap power supply - ends up in a loop and fries itself and/or some other components.
If you get a more powerfull PSU, you eliminate this risk, even if it's a crappy PSU. That the crappy one would probably burn itself out because it's...crappy :) is another discussion.
Clearly a simplification, but not overly so, I hope.
The manufacturers (nVidia in this case) can't know what anyone would choose to put in their systems. They recommend a 500W PSU. An advice, nothing more. Just to be on the safe side.
What you actually do with your PC and your money is your problem.
So....is a GTX970 going to run on a 450W PSU ? Yes.
Is it going to run without problems ? Maybe. Maybe not. You take a risk. And if something goes wrong, you can't blame others for not telling you: go for 500W or more.