The human eye can't detect smoothness above 25 fps, in any situation.Not i'm telling this, according with researchers.

I'd sure hate to have to cross a busy street with my brain only processing the environment at 25 fps. The U.S.A.F. has pilots that can detect a flash of light lasting only 1/150th of a second. FPS should only be loosely associated with smoothness. For example, I can fly the MD11 as low 18 fps and still have that smooth feeling, but if I try flying an Extra 300s at the FSX Redbull course I'll almost certainly crash before I cross the finish line. Why? My guess is latency. With the MD11 there's little perceived lag between my head and what my eyes think it should see on the computer monitor (the md11 is a pig -slow). On the other hand, the Extra 300s, or the Mustang, are very responsive aircraft that can turn on a dime at a 140 mph; so in order to convince my mind that all is real (smooth) I'm gonna need some major FPS! Now does 'major' fps mean smooth ...uh, no. Only a properly tuned FSX.CFG file can guarantee that. p.s. I run two different fsx.cfg files; one for airliners, the other for racing - for minimal I/O lag between my head and monitor (usually means a boat load of FPS).

Thank you! you have given me the best example to use on people who just dont get it. If 30fps was the maximum for our eyes, then you would not see most of your photo camera´s flashes or a strobe light at a club.

Thank you! you have given me the best example to use on people who just dont get it. If 30fps was the maximum for our eyes, then you would not see most of your photo camera´s flashes or a strobe light at a club.

you dont understand fps .. sry

I'm personally satisfied somewhere beween 18-22 fps. However, I'm happier with 25 fps or better. Beyond this though, I appreciate little improvement. BTW, I'd challenge those who claim the human eye can't detect >25 fps to provide proof. I'm not an ophthalmologist, however I do have a medical degree (practicing another specialty), and there is no part of the eye that is limited to 25 Hz. Visual processing is overall a very complex phenomon and a single recording isn't going to tell the whole story. However recordings of the optic nerve shows a range of frequencies of 400-1600 Hz depending on the fibers recorded (Hz translates directly to FPS). For most, 23.9xx fps may appear fluid. However, this is not the limits of the eye. Eric Szczesniak

Hey Guys,I have a very hi end machine (2600k @ 4800 and a 580 GTX) and i seldome see frame rates above 30. Ont the moste big airports i habe in vc about 15 in the middle. I use REX 2, and some airpot addons. What cpuld be the reason, or is it normal?

I dont know is it normal, but I have similar frame rate with low end system, but again, I have to chose between performance and quality.

you dont understand fps .. sry

What makes you say that? the camera flash example? Imagine your eyes were really a fast slideshow that updates only 20 times per second. That means that during 0,05 seconds, you would only see one slide, until the next one kicks in. Say that during that 0,05 seconds, the disco strobe switched on and off 5 times... you wouldnt notice. But you do! So, your eyes and brain are capable of more temporal subdivisions. Trust me, 100fps is clearly more fluid than 20fps to the human eye. 20fps feels like a screen, 100fps feels like the screen is really a window. Saying that there's no difference between 100fps and 20fps is pure falacy... and as Zach said, an indication that you've never seen how fast refresh screens look like. Full size flight simulators have really fast refresh rates and frames per second. Graphics are really poor in most of the sims (except the really new CAE ones), but the fluidity is really necesary for training motor skills.

I really don't understand the argument. I mean, there's an obvious difference between 25 and 60 fps. Case closed.

I really don't understand the argument. I mean, there's an obvious difference between 25 and 60 fps. Case closed.

Yes but what maybe i should have asked is, if 20 or 25 FPS i acceptable to some people, is setting it down from 30 or 40 going to smooth the sim any? Or even free up some horse power that can be used somewhere else. On a lower spec PC for instance?

Yes but what maybe i should have asked is, if 20 or 25 FPS i acceptable to some people, is setting it down from 30 or 40 going to smooth the sim any? Or even free up some horse power that can be used somewhere else. On a lower spec PC for instance?

that's what triggered one of Zach's commentsD. is in denial to the fact that new hardware is in order

25-30 Yes. I can notice the difference between 25 and 30.

Still the debate is on! nice, 25 is what we need above that everything too good.

Hey Guys, I have a very hi end machine (2600k @ 4800 and a 580 GTX) and i seldome see frame rates above 30. Ont the moste big airports i habe in vc about 15 in the middle. I use REX 2, and some airpot addons. What cpuld be the reason, or is it normal?

No, I guess that is not normal.I have a 2600k@4000 and a 280 gtx. Use REX 2 and Ground environment 2. (all my sliders to the right, except water mid1x and no bloom) 20-30 is normal on most big airports on my system.At small airports or fax default airports it is 30-40 or higher if I don't us a limiter. Eric

It looks like sandy bridge processors make a huge difference.I have an i7-950, a GTX570 and 16Gb of RAM, and I don't think I'd ever get close to 30fps with all the payware that you mention including NGXs virtual cockpit. At the moment, the only payware I'm using is NGX. I really dont care about eye candy. As long as I have a runway and precise navaids, the rest is unnecesary for me. But i have to confess, sometimes i want to look out the window. Is the generation of computers that will run FSX easily getting closer already or will the the new Microsoft Flight be the real solution for a zero problem, full performance simulation?

That is very diaappointing. I have the 990X with a 590 card and get >100 fps in the 2D and 50 + in the 3D. Hitting a FlyTampa airport like Tampa, I dip a bit below 50 fsp but never < 35 fps.