PSU for GPU

[Ygovec Jason]

My PSU is cx 450m
my gpu i will be buying is GTX 970 Gigabyte IXOC

does the power supply be able to power this gpu , does it has the 8 pin?
Recommended PSU 400W(with one 8-pin external power connectors)

 

[raisonjohn]

Yes, your current PSU (Corsair CX450M) will be enough (assuming you have a CPU with a less than ~100W TDP). It has two 6+2pin (8-pin) PCIE supplemental power connectors, so just use one to plug in your GTX 970.

Power consumption of a basic system using the Gigabyte GPU in FULL stress is ~250W. The card alone draws about ~170W. http://www.guru3d.com/articles_pages/gigabyte_geforce_gtx_970_oc_mini_itx_review,7.html

Your CX450M can provide up to 448.8W (or 37.4A) at the +12V rail. http://www.corsair.com/en-eu/cx-series-cx450m-450-watt-80-plus-bronze-certified-modular-atx-psu-jp

It's enough.

 

[Virtual_Singularity]

Raisonjohn may be correct, I'm not going to say your PSU won't cut it. However, you'd be cutting it very close & it likely wouldn't be advisable in the long run. Using a 450w PSU, depending on variables like CPU, apps/games settings, OCing, your sys would likely run a power deficit some of the time. Even if you didn't OC. 550w/650w would be a better bet.

At very least a somewhat decent 500w PSU. This question has been asked on this site and others before with varying answers, please feel free to search a bit before deciding. You're better off, always, leaving yourself some spare power exceeding your system's bare min.

 

[raisonjohn]

It won't have any power deficit. The ~250W power consumption tested above by guru3d is the GPU in FULL stress and using an 8-core i7-5960X at 4.4GHz (OC'd) on all cores with energy saving functions disabled.

The 250W fully-stressed load is only using 55.7% of the CX450M's rated +12V rail - near the 50% point at which best efficiency is achieved in PSU's.

Note that the Corsair CX450M, which you already own, can achieve peak power of up to 495W, and is a decent/good-quality PSU (it is the 2015 updated version of the older CXM series, which were discontinued already).

 

[Virtual_Singularity]

I stand corrected. Gigabyte's own spec page for the gpu mentioned recommends 400W. The cx450m is indeed a better quality PSU than it's predecessor, & with a peak power of 495W it should be fine. Thanks for the info btw, and come to think of it, I didn't take the fact its an ITX card(& maybe ITX build) into consideration either.