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650 ti boost is under 200 go with that you will be fine long realize most things have a drop notch or two, or if 300 dollars get 660TI.  Would not bother 670 or 680 as that overkill unless if you have mulitple monitors and hate jagglies and want pretty clouds

I've read a lot about FSX and how it needs high CPU freq, but I found out that it isn't that true in the end! I have i5 4,3Ghz, 16GB Ram and Ati 6870 1Gb, I get around 25FPS with NGX in a heavy situation. Last week a friend of mine bought a 680GTX card and I ask him to come with it so I can test to see if it worth the investment for my next GPU upgrade, guess what.... The GPU makes a huge difference in FSX performance, so huge that my frames got as high as 50 in the same scenery that my current GPU only get's 25. 

 

For your question get the most expensive GPU that you can afford it will make a huge difference in your FPS!!!!!!

 

I am no expert on hardware.

But as I gathered info on various forums so I could build a good system, I learned from those that realy know what they are talking about, that things have to balanced out.

 

And I have accepted that Nvidia GPUs are better for FSX than ATI.

(This is a matter of who you talk to though and as I said, I am no expert and just choose to believe the Nvidia team)

 

Keeping the above in mind, the reason you experienced a huge gain is because you:

1) changed from ATI to Nvidia

2) With your nicely overclocked system (4.3GHz) a high performance GPU (such as the GTX680) is a far better match/balance and overcomes the bottleneck you obviously have with the ATI.

 

On the other hand, Metthew is running an older system with a not overclocked (2.9Ghz) CPU. if what I have learned is true, (that things have to be balanced) than he will not gain much even with the GTX680 because his [email protected] will bottleneck the GTX680.

 

But I totally agree with you when you say "hey, FSX is not JUST cpu dependant!

I made the same experience a few years ago with FS2004.

I changed my 9800GT to a GTX460.

Many said it would not help.

I can tell you, the change that made was phenomenal!

 

Just for info, 50fps with the NGX is extremely good in my opinion.

 

I have a hard time maintaining 30fps with a [email protected] + GTX680 when flying the PMDG b737 NGX over GEX, UTX and REX.

 

Just for info, 50fps with the NGX is extremely good in my opinion.

 

I have a hard time maintaining 30fps with a [email protected] + GTX680 when flying the PMDG b737 NGX over GEX, UTX and REX.

 

You have a hard time maintaining 30fps because you probably use 4086 clouds. I have 1024 clouds, I don't see the need for using 4086 clouds and I don't  see the need for using any photoscenery, those resolutions only helps at CTD! I'm very happy with 1024 clouds + GEX and FS Global this is the best combination - I never had a CTD as I don't exceed 4gb limitation, I don't like REX, only FEX! 

Nope, also using 1024 clouds and no photoscenery.

 

I was told at other forums that my performance is actally normal.

I use the 1/2Vsync in Nvidia method with FSX locked internally at 30fps.

 

If I go unlocked I will get spikes to 50fps (or higher) as well but the result is way less smooth than 30s fixed with 1/2Vsync.

 

Do you get spykes up to 50fps per second or a solid 50fps?

That would be unusually high (solid 50fps).