Is this Fortron PSU fine for the 7970?

Latvietis96 · Jun 22, 2013

I just got the sapphire HD7970 and I`m concerned about my power supply,

It says 500v is the minimum PSU requirement for the 7970 on the box but I assume you guys know better.

Sakkura · Jun 22, 2013

If your CPU isn't too power-hungry and the 12V rails are distributed right, it's possible. But I would recommend a PSU upgrade. That one is too close for comfort IMO.

geofelt · Jun 22, 2013

FSP is a decent psu maker. If the unit has a 6 pin and a 8 pin pcie power connector, then you should be good.
If it is an older model without the two connectors, do not try to use molex adapters to do the job.
It is better to buy a quality modern psu .

Goodeggray · Jun 22, 2013

Overall that psu fits the power need for a 7950 system and Fsp is a decent manufacturer, but the psu uses 2 12V rails rather than 1. Most psu use one rail because all the power is available no matter how it's wire. but the Fsp can put out 216W per rail so it should be fine.

Latvietis96 · Jun 22, 2013

geofelt :

Why not use the molex adapter? I mean one was included in the box

geofelt · Jun 22, 2013

Latvietis96 :

That assumes that the psu has the power in total.
But, if a psu has the power, it will supply the leads to use that power. Older psu's did not deliver their wattage where it is needed most, namely to the 6 or 8 pin pcie leads.

I think you might be able to make it work. If there is not sufficient power delivered to the graphics card, you may get artifacts, the card may down clock, or possibly not even work at all.
These symptoms may not show up at idle, but become more pronounced while gaming or doing a stress test.
The other problem with an underpowered psu is noise. The fan will spin up to keep the unit cool.

But, I think a underpowered quality psu is unlikely to cause any permanent damage.

So, go ahead and try it.

Latvietis96 · Jun 23, 2013

This is the adapter that was included, but it has 2 of those molexes, do i have to plug in both of them?

*in this pic it`s a 6 pin connector but i got the 8 pin*

Sakkura · Jun 23, 2013

With an adapter like that, the extra load will be applied where the PSU isn't really designed for it. It may overload one of the rails.

Latvietis96 · Jun 25, 2013

OK so now that I know i have to get a new PSU, could you help me choose a cheap PSU that would be fine for the 7970? I`m looking at this PSU right now http://www.chieftec.eu/en/psus/a-80-series/ctg-650c.html but i`m not so sure whether the cheap chieftecs are good or not.

geofelt · Jun 25, 2013

I suspect chieftec is a cheap unit.
A cheap psu becomes very expensive if it does not deliver advertised power or damages everything it is connected when it fails.
Buy a quality unit, at least a tier 3 unit from this list:
http://www.eggxpert.com/forums/thread/323050.aspx

Latvietis96 · Jun 26, 2013

geofelt :

Thanks for the link, i`ve been looking for something like that.

Latvietis96 · Jun 30, 2013

So before I proceed, I`m getting this PSU: http://
Does it have all the required pins?

geofelt · Jun 30, 2013

Looks good

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Is this Fortron PSU fine for the 7970?

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