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Swapped a graphics card, getting screen flickers, power consumption?

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May 7, 2014 5:32:56 PM

I recently swapped out an old AMD HD 7750 1GB graphics card with a AMD HD XFX 7870GHz Edition, and from time to time, seemingly randomly, I would get screen flickers on my dual monitor setup. Both the monitors were brand new, and cables as well, and it will flicker even while idle. I am curious, because the first thing I thought might be wrong is the power supply being overdrawn, but from what I've heard that can't be the case. I just want to ask a more knowledgeable community and see what you guys think. Here are my current specs with the new 7870:

AMD FX-6100 3.3GHZ
1TB SATA III 7200 RPM 3.5" HARD DRIVE
GSKILL 16GB DDR3 16000MHZ RIPJAWS-X MEMORY
ASETEK 510LC 120MM WATERCOOLER
2 CASE FAN 120 MM
BLACK SAMSUNG 24X DVDRW
GIGABYTE GA-970A-D3 AM3+ CROSSFIRE USB3.0 SATA 3
XTREMEGEAR 700 WATT POWER SUPPLY
XFX Double D FX-787A-CDFC Radeon HD 7870 GHz Edition 2GB 256-Bit GDDR5 PCI Express 3.0 x16
a b U Graphics card
May 7, 2014 5:47:48 PM

It could well be that powersupply. What makes you think it's not?

Have a read of this forum, they're discussing that PSU you have in your rig there: https://www.cyberpowerpc.com/forum/forum_posts.asp?TID=...

If it provides its rated amperage, then it should power your system just fine (especially at idle!), but ripple is nasty and can do strange things. Also, lots of cheaper PSUs outright lie about their output.
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May 8, 2014 10:23:25 AM

So in essence I just need to swap out the PSU and I should be fine? I was afraid my PSU was a little junkie but never got around to looking into it. If I were to swap it for something like a Corsair HX750 750 Watt would I be better off? Im a little clueless as to what is better when it comes to power supplies. Thanks for the help anyway
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May 8, 2014 10:24:21 AM

rhysiam said:
It could well be that powersupply. What makes you think it's not?

Have a read of this forum, they're discussing that PSU you have in your rig there: https://www.cyberpowerpc.com/forum/forum_posts.asp?TID=...

If it provides its rated amperage, then it should power your system just fine (especially at idle!), but ripple is nasty and can do strange things. Also, lots of cheaper PSUs outright lie about their output.


So in essence I just need to swap out the PSU and I should be fine? I was afraid my PSU was a little junkie but never got around to looking into it. If I were to swap it for something like a Corsair HX750 750 Watt would I be better off? Im a little clueless as to what is better when it comes to power supplies. Thanks for the help anyway
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a b U Graphics card
May 8, 2014 4:50:06 PM

There's a reasonable chance it's your PSU, but there's no way to know for sure without swapping it out. If the problem only occurred under load, it would point much more heavily to your PSU, but the fact that it's happening when the GPU is basically at idle is a little strange.

Either way though, that PSU is not the best and you'll want to upgrade.

A HX850 is total overkill. A good 500W PSU would power that rig just fine, or 650-700 if you want the option of Crossfire down the track. If you're unsure about powersupplies, just buy either a Corsair or Seasonic and you can't go wrong.
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