RX 480 minimum wattage problem

[Joe007destroyer]

I want to build a gaming PC, i7 6700, RX 480, H100i v2, MSI H110 PRO AC motherboard, Fractal Design Nano S, Crucial Ballistix Sport LT 8 GB, CX450M power supply) and I already ordered all of the parts yesterday (Amazon) but something concerns me, I ordered the 450 watts power supply from corsair, and I read this morning that the minimum power supply for a RX 480 is 500 watts, 550 recommended, how bad is my problem? Should I concern a lot?

[TheRandomness]

It's fine. Minimum ratings are usually too high anyway. Recommended ratings are still too high. Welcome to the forums btw

[kappakali]

should be alright.

Welcome to the LTT Forums

[Joe007destroyer]

So am I good with that power supply?

Thanks!

[STRMfrmXMN]

Just now, Joe007destroyer said:

So am I good with that power supply?

Thanks!

"The 450W power supply from Corsair"

 

Which 450W PSU from Corsair? Can you give us an exact model?

[Joe007destroyer]

CX450M

[don_svetlio]

You're fine. CX450 is CXv4 so it's decent. CX430 is CXv3 and is shit

[mariushm]

The video card will consume up to around 160 watts all by itself, and about 140-150w of these from 12v. If you overclock it, it will go up to about 200 watts.

The processor will probably use up to around 100 watts from 12v, the cooler and fans will use about 3-4 watts from 12v , the memory uses about 3-4 watts per memory stick (which are taken from 3.3v or 12v, depending on motherboard design)

The motherboard uses maybe 10-25 watts, mostly from 5v (for chipset, onboard network, onboard audio etc)

 

So as long as the total consumption on 12v is below what the power supply can offer, you're good.

The CX450M tech specs page says it can do about 448 watts on 12v, so even with some overclocking on your cpu, it looks like you'll barely go over 300 watts on the 12v.. plenty of reserve up to 450 watts.

 

You'll be fine.

[Joe007destroyer]

2 minutes ago, STRMfrmXMN said:

"The 450W power supply from Corsair"

 

Which 450W PSU from Corsair? Can you give us an exact model?

CX450M from Corsair

[Joe007destroyer]

Thanks a lot for everything!

[Naeaes]

Technically, if it has the correct connector(s) natively and it's ATX/Intel EPS -specified, it's powerful enough. However, you're kind of pushing the limits. If you can return the PSU, do it. It's rated to run at max 40 degrees C ambient (see the specs here) which is really low for a gaming computer. If it was rated for ample watts, it'd be less of an issue, but it's not. Pushing it will cause it to overheat, which'll cause jitter and which'll cause crashes and break stuff over time. Do not skimp on your PSU, man!

[STRMfrmXMN]

2 minutes ago, Joe007destroyer said:

CX450M from Corsair

That will work.

[DrMikeNZ]

3 minutes ago, mariushm said:

If you overclock it, it will go up to about 200 watts.

Overclocking doesn't look to be the intention with the non K CPU, this is not an issue.

 

 

[mariushm]

Just now, DrMikeNZ said:

Overclocking doesn't look to be the intention with the non K CPU, this is not an issue.

I meant overclocking the video card. Not the CPU.

[Joe007destroyer]

2 minutes ago, mariushm said:

I meant overclocking the video card. Not the CPU.

Don't worry I don't plan on doing any overclocking at all, is my first build and I don't want to have many trouble with overclock

[mariushm]

6 minutes ago, Naeaes said:

It's rated to run at max 40 degrees C ambient (see the specs here) which is really low for a gaming computer. If it was rated for ample watts, it'd be less of an issue, but it's not. Pushing it will cause it to overheat, which'll cause jitter and which'll cause crashes and break stuff over time. Do not skimp on your PSU, man!

It can output 450 watts continuously at ambient temperature of 40c. It's not guaranteed to output 450 watts continuously if the temperature inside the case goes over 40c, simply put they say the fan won't be able to push enough air through the power supply to keep everything within the temperature ranges they want, therefore some components may go bad prematurely if you keep the power supply working in those conditions for long periods of time.

This  rarely happens with a system that uses such a CPU and such a video card, like the ones mentioned.  The power supply won't blow up or output low quality voltage with higher ambient temperature, because your system won't pull more than 300 watts from it.

 

The RX 480 reference cards have a fan which pull air from the case and blow it out through the heatsink so all the air moved outside the case makes way for cold air to come inside from the front of the case.  

The CPU usually is towards the top of the case and usually there's a case fan nearby to suck the warm air out.  The power supply is usually mounted at the bottom of the case, if the cooler is at the bottom of the case it will pull cold air from the bottom so the ambient temperature inside the case won't really matter.  If the power supply is mounted with the fan inside the case, the air at the bottom of the case will still be the lower temperature air so there's nothing to worry about.

 

Like I said, he'll be fine with this power supply.

[Charles_2007]

If you look at the specifications on Corsair's site, you can see the max current draw on each rails that your power supply can provide :

 

20A for the 5V, 3,3V

37.4A for the 12V

http://www.corsair.com/en/cx-series-cx450m-450-watt-80-plus-bronze-certified-modular-atx-psu-jp

 

According to Tom Hardware, the Radeon Rx480 will need: 7,6A + 5,9A  so your PSU will have no problem.

http://www.tomshardware.com/reviews/amd-radeon-rx-480-polaris-power-fix,4668.html

 

However, my Coolermaster 500W is actually rated lower on the 12V rail at 2 x 18V but it will still work with the Rx480 but with less headroom than your Cx450m

 

So AMD is asking for 500W or 550W power supply for a margin of security because not all 500W power supply are created the same and your 450W power supply will actually be better than my 500W power supply.

 

 

 

 

[Teddy07]

minimum wattage is overrated. I used to power my i7 4790k (non oc) and my gtx 960 with a 350w powersupply despite the 400w min. wattage. I even measured  the electricity under full loud and my pc would drain with my monitor only 200.

 

I upgraded my cpu first and i am now using a gtx 1070

[Liloo]

On 7/24/2016 at 7:11 AM, Joe007destroyer said:

I want to build a gaming PC, i7 6700, RX 480, H100i v2, MSI H110 PRO AC motherboard, Fractal Design Nano S, Crucial Ballistix Sport LT 8 GB, CX450M power supply) and I already ordered all of the parts yesterday (Amazon) but something concerns me, I ordered the 450 watts power supply from corsair, and I read this morning that the minimum power supply for a RX 480 is 500 watts, 550 recommended, how bad is my problem? Should I concern a lot?

what if rx480 is Overclock? can 450watts psu still run it?

 

[mariushm]

If you scroll up a bit, you'll see my reply from 2016 which explains that even with overclocking, a good 450w psu is more than adequate and enough.

 

A RX 480 won't go over 200 watts of power consumption, and the rest of your system is unlikely to consume more than 100-150 watts, so you'd be fine.