Is my PSU good enough?

[Scorched97]

Hi everyone
I wanted to ask if my PSU is good enough for this configuration (i already bought all the parts):
PSU Blueberry ATX PSB450w
(https://static.kupindoslike.com/Blueberry-PSB450-450W_slika_XL_29207315.jpg)
Motherboard MSI h81 p33
CPU G3258 3.2ghz(1.25v) OC @ 3.5ghz (1.25v)
GPU ATI Radeon HD 6870 1GB sapphire
HDD SATA 500GB Seagate
RAM 1xHyperX Fury 4GB DDR3
1 DVD/RW device
Other devices: 1 fan on cpu 120mm (came with the cpu)

Currently, my PC has every part except the GPU, which i dont want to risk pluging in.
I've been to power supply calculator ( http://www.extreme.outervision.com/psucalculatorlite.jsp )
and it says: Minimum PSU wattage 265w and recommended wattage 315w.
It also recommends me to buy a 500w PSU.
My biggest concern is the GPU since it takes almost half of the recommended wattage (goes down to 187w without it in the config).

I know that the official minimum PSU for this GPU is 500w, but since my CPU takes only 58w when OC-ed at 3.5ghz i wanted to know is it possible to run this config on this PSU.

 

[Rhezner]

yeah you should be good to go.

Realistically not even a 290x would need more than a 450 watt system

look at this benchmark - http://www.anandtech.com/show/7457/the-radeon-r9-290x-review/19

keep in mind this is the entire system power consumption

with a 4960x at 4.2 ghtz as well - http://www.anandtech.com/show/7457/the-radeon-r9-290x-review/7

 

[Karadjgne]

The Sapphire HD6870 (either version) recommends a 500w psu exactly for the reason of the psu quality.

You are looking at @150w just for your system, and another possible 225w for the gpu. That'll put normal-heavy usage at 300w-375w max. While theoretically your blueberry has enough wattage for the gpu, realistically it comes up extremely short. The HD6870 also requires a psu with available minimum of @27Amps on the 12v rail. The blueberry 450w has 12A on the 12v rail, which for a 450w unit is miserably low. Basically the blueberry psus are built for workplace-office computers that have almost no graphic requirements beyond normal Windows usage with a built-in igpu.

Sorry, but for a pc designed with gaming needs, that psu is junk. It will not work, and you are correct in your assumption not to install the gpu. I would get your money back for that unit, or at very least get credit for it towards a psu designed for higher power gpu requirements.

 

[Scorched97]

Thanks for your oppinion, its exactly what i tought.
I know that this is a lower tier PSU, i forgot to mention that it was the only part that i didnt buy.
I'll buy a much better PSU with 600w, should be enough, dont wanna risk my pc on a psu if i can wait another week.

 

[Karadjgne]

@Rhezner

While a majority of 290x run @225-275w nominally, so should theoretically run on a low power pc with a 450w psu, there are 2 distinct problems with 'theoretically'

1st is lack of availability of quality 450w psus that have 2x 8pin pcie connectors or at least 2x 6+2pin pcie.
2nd is that the 290x are also known to quite commonly spike 12v to 350w or higher, which would instantly shut down a good quality well overpower/over current protected psu, or fry a lower quality - mid quality psu, which is the most commonly found.

For all intents and purposes, the r9 290x of any design/brand/model requires a minimum of a 600w psu, and thats exactly what it should have.

 

[Karadjgne]

@OP.

Quality counts as much as quantity, you'd be better off with a high quality 500w unit over a similar priced mid tier 600w. Personally I can't even think of a good - high quality 600w unit, 520w yes, 550w yes, 620w yes, but not 600w. You may not be building an uber gaming machine, but that's not that important overall. The psu is always overlooked, as it does exactly nothing towards any performance. Unfortunately, this is exactly backwards thinking. The psu is the single most important component of the pc. It directly affects ever other component requiring power of any sort.

http://www.tomshardware.com/reviews/low-cost-psu-pc-power-supply,2862.html

Low-cost PSU power supply tests:
https://youtu.be/f6snWfd1v7M

Good luck with your shopping.