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Screen occasionally goes dark after installing GTX 750 Ti (powered by PSU FSP Saga II 400)

Tags:
  • Graphics Cards
  • VGA
  • gtx 750 ti
  • Graphics
  • saga ii 400
  • psu
Last response: in Graphics & Displays
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March 15, 2014 7:47:30 AM

I just purchased the card and after installing drivers the screen went dark I had to restart. From then the computer starts going black occasionally, particularly when I load up some games. Nvidia recommends a 300W PSU so I initially don't think the fault's on my PSU but lots of people had kind of the same problem and were advised to replace the PSU.

This thread below also suggests that the PSU can power the 650 Ti just fine while the 750 Ti doesn't even require a 6-pin connecter:
http://www.tomshardware.com/answers/id-1819530/safe-pai...

My stats are:
i5 2400
4GB Gskill RAM
WDCGreen 500GB
FSP Saga II 400 with dual 12V rails (17A each)

More about : screen occasionally dark installing gtx 750 powered psu fsp saga 400

a c 302 U Graphics card
March 15, 2014 8:22:38 AM

Your symptoms are those of a lack of sufficient power.

Exactly which GTX750ti do you have?
The ones I see need a 6 pin aux power connector.

The card needs usually 20a and a 6 pin connector.
Your psu can deliver 27a, so you should be ok there.

Could you possibly have missed your 6 pin on the card, or possibly the aux 6 pin connector is not securely installed.
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March 15, 2014 8:58:15 AM

geofelt said:
Your symptoms are those of a lack of sufficient power.

Exactly which GTX750ti do you have?
The ones I see need a 6 pin aux power connector.

The card needs usually 20a and a 6 pin connector.
Your psu can deliver 27a, so you should be ok there.

Could you possibly have missed your 6 pin on the card, or possibly the aux 6 pin connector is not securely installed.


Mine is ZOTAC GTX 750 Ti 2GB (non OC) here: http://www.zotac.com/en/products/graphics-cards/geforce...

Surely it shouldn't take up that much power right? A few seconds after entering a game and it's pit black.
The lights on my mouse is still on so it's probably not shut down.
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a c 302 U Graphics card
March 15, 2014 9:10:13 AM

Interesting that the specs show the inclusion of a molex to 6 pin pcie adapter.
Yet, I see no such 6 pin port on the card.

I think perhaps, there is a card defect and a rma is in order.
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March 15, 2014 11:28:26 AM

OK so I've been playing for the last one hour or so and it's been smooth. I think I've found the solution for myself:

The drivers on the disk that came with the box is actually of an older version (332.xx) and I think it doesn't support such a new GPU as GTX 750 Ti. So all I did was simply install the latest driver and restart (had to manually download on guru3d; my computer somehow can't connect to Nvidia using the Geforce Experience software).
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a c 302 U Graphics card
March 15, 2014 1:16:12 PM

Good job.
The simplest explanation is often the best.
I don't know why you could not run the latest driver from nvidia without using the GeForce experience software.
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March 16, 2014 7:41:10 AM

Ok so maybe I was wrong. The problem persists though not immediately after entering the games. This got me thinking maybe it was the PSU after all. Does anybody know a PSU that is comfirmed to work with the 750 Ti?
To think that just 2 days ago I thought my 400W PSU was more than enough for such a low power GPU…
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a c 302 U Graphics card
March 16, 2014 8:13:15 AM

FSP is one of the better budget psu brands. I do not know how your particular model ranks.
It is not an issue of power, 400w and 27a is sufficient.
Possibly, your psu is deficient in some way.
Since the pcie slot is what gives the graphics card all the power, you could possibly have a motherboard issue.

Can you borrow a different psu to try it?
If you want to buy a new psu, Seasonic makes about the best quality units.
A 350w(27a) unit would not be that expensive:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

I have no problem overprovisioning a PSU a bit. Say 20%.
It will run cooler, quieter, and more efficiently in the middle third of it's range.
A PSU will only use the wattage demanded of it, regardless of it's max capability.

I would buy a stronger 550-650w unit that could in the future support a very strong upgrade, even a GTX780:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

If possible, buy from a vendor that will allow you to return the unit, even with the typical 15% restocking fee.
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March 16, 2014 9:28:38 AM

My PSU is roughly 2 years old without proper maintenance so does that add to the problem?

Thanks for your concern and recommendations though. They are much appreciated. I'll try to buy a new PSU and get back here to report if that would fix it.
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a c 302 U Graphics card
March 16, 2014 9:34:43 AM

I don't know what maintenance there is to be done on a psu. Possibly clearing out dust.
A psu will have capacitors that can age over time. Particularly cheap units.
2 years does not seem like long enough for that.

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