SLI 295 GTX Causing Screen Flicker

August 3, 2009 at 21:51:21
Specs: Windows Vista 64, i7-950 / 6 GB
With the a better computer, i am getting flickering and some color shifting while playing games with the same monitor i used with an older computer. the flicker is either nonexistant of unnoticable while simply looking at the desktop. My old computer ran 7800gtx's in SLI with no screen flicker at all with my dell 2005fpw widescreen LCD. With my new computer's 295 gtx's in SLI, i am noticing screen flicker using 60hz @ 1680x1050 (same res as old computer ran). On top of this, the colors seem to shift back and forth between a red/blue cycle. the color shifting is subtle, but this example may help: when looking at an orange background it may pulse between a darker orange and a grayish orange.

any ideas on what could solve my flickering and color shifting problems? perhaps a new monitor with a higher refresh rate (although i don't believe there are LCD's with higher than 60hz rates)?

EDIT: old comp was on XP, new is on vista 64, and i did try running games i see flicker on with compatibility mode.


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#1
August 4, 2009 at 15:06:50
Do you have a power supply with enough +12v amperage to fulfill the needs of 2x 295 GTX's?

"The power consumption levels of the GeForce GTX 295 are extreme, though this is to be expected for such a high-end performance part. Under load the GeForce GTX 295 system configuration sucked down 434 watts, which will likely have a negative impact on the power bill."

"The GeForce GTX 295 managed to use slightly less power than the 4870 X2 under load, but it was a little more hungry at idle. Furthermore, the GeForce GTX 295 used just 7% more power than the GeForce GTX 280 when under load, while it did suck down 34% more power at idle.

Bottom-line when talking about power consumption is that the GeForce GTX 295 requires a truck load, but no more than similar competing products."

http://www.techspot.com/review/139-...

"Recommended Power Supply

So here's my power supply recommendation:

GeForce GTX 295

A GeForce GTX 295 requires you to have a 700 Watt power supply unit at minimum if you use it in a high-end system. That power supply needs to have (in total accumulated) at least 50 Amps available on the 12 volts rails.

GeForce GTX 295 Quad SLI

A second GeForce GTX 295 requires you to add another 300 Watts. You need a 1000 Watt power supply unit if you use it in a high-end system. That power supply needs to have (in total accumulated) at least 70 Amps available on the 12 volts rails."

http://www.guru3d.com/article/gefor...


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