I've tried looking around for an answer to this, but couldn't really find a definitive one.

 

I'm recently went from a 560 to a 580 in the hope of closing the gap in performance between clear skies, and when there's complete overcast (I lost a good 6-7 FPS with the 560) and it has slightly improved with the GTX 580.

 

My question is what kind of performance degradation does someone with a GTX 670/680 see with overcast clouds or stormy weather? I tested the 560/580 with addon scenery (UK2000 Heathrow to be precise) as the difference is much more noticeable than at default scenery airports.

 

Thanks.

I'll edit this post soon when I get your answer, my 680 is arriving in about 2 hours.

Oh well, couldn't edit the post.

 

About 5fps loss compared to clear skies with 680.

I notice almost no FPS loss in clouds with my GTX 670. However when I use 2xSGSS I am getting huge FPS fluctuations so that's why I don't run 2xSGSS, it's simply not worth it imo. I now run 8xSQ AA, 8x Supersampling, 16x anisotropic filtering, standard VSync with 1/2 refresh rate, unlimited FPS in FSX, and it all runs very well.

Oh well, couldn't edit the post.

 

About 5fps loss compared to clear skies with 680.

I notice almost no FPS loss in clouds with my GTX 670. However when I use 2xSGSS I am getting huge FPS fluctuations so that's why I don't run 2xSGSS, it's simply not worth it imo. I now run 8xSQ AA, 8x Supersampling, 16x anisotropic filtering, standard VSync with 1/2 refresh rate, unlimited FPS in FSX, and it all runs very well.

 

Thanks to you both. Arjen, I tried removing 2xSGSS and used 8xSS instead - and it did indeed put a stop to the clouds affecting performance. The only issue I have with removing 2xSGSS is that it causes addon airports to shimmer (for me). Do you get that issue as well?

Thanks to you both. Arjen, I tried removing 2xSGSS and used 8xSS instead - and it did indeed put a stop to the clouds affecting performance. The only issue I have with removing 2xSGSS is that it causes addon airports to shimmer (for me). Do you get that issue as well?

 

A little bit of shimmering in the distance but not much. Also a little bit of shimmering on the displays of the 737NGX and MD-11. Quality to performance wise, it's in my opinion not worth running 2xSGSS. I'd rather have a little bit of shimmering then. If you want to upgrade to a 600 card, buy the GTX 670. I heard that there is litterally no difference whatsoever between 670 and 680 apart from when you are running 3 screens and/or high resolutions (higher than 1080p), then a 680 might give you 3 FPS more, otherwise not. Compared to a 580, a 670 will do a tiny bit better in FSX (3 FPS), but not much. Big advantage is mainly in other games.

A little bit of shimmering in the distance but not much. Also a little bit of shimmering on the displays of the 737NGX and MD-11. Quality to performance wise, it's in my opinion not worth running 2xSGSS. I'd rather have a little bit of shimmering then. If you want to upgrade to a 600 card, buy the GTX 670. I heard that there is litterally no difference whatsoever between 670 and 680 apart from when you are running 3 screens and/or high resolutions (higher than 1080p), then a 680 might give you 3 FPS more, otherwise not. Compared to a 580, a 670 will do a tiny bit better in FSX (3 FPS), but not much. Big advantage is mainly in other games.

 

Yeah, I don't see any shimmering in the VC of the NGX, but more on the scenery - but I'll definitely be keeping the 8xSS over 2xSGSS. Even fully overcast skies with 4096x4096 (with UK2000 Heathrow) there's zero FPS impact over clear skies. Thanks.

Try 2xSGSS and AF set to app. controlled, then filtering to Anisotropic in the FSX options

Try 2xSGSS and AF set to app. controlled, then filtering to Anisotropic in the FSX options

 

Thanks, I just tried this and got the same FPS hit with clouds. It may have been slightly better, but with 8xSS there seems to be zero hit so far.