Hello,I don't know if someone has experienced my problems with antialias on Nvidia FX cards, MSI FX5900 non ultra in my situation.I fly with AA set at 4xS with wonderful image quality (can't go back after 4xS). I set 4xS with the NVHardPage tweaker, the default display options do not show 4xS, only 4x.The problem is that at 4xS, the card apply AA also to the ALPHA textures, and you can guess what kind of textures are used to build the clouds... yes ALPHA textures !So when I fly at dense clouds, the frames drop VERY low (5-8 FPS) and I'm flying on a P4 2.8Ghz with 1GB RAM with everything tweaked for max. performance, I fly at 1280x1024x32bits.The 4x mode do not apply AA to the ALPHA textures, so it's considerably faster than 4xS, but at lower image quality.Based on my researchs and considering the ALPHA textures issue, I don't see any alternative, only a driver miracle from Nvidia or maybe switching to a Radeon card.So, meanwhile, I found a little trick (maybe it's vox populi but for me it was a discovery):I fly at 4xS, when the clouds are too dense I go to the NVHardPage tweaker and I set 4x, then I switch to full screen and back again to windowed mode on FS2004 and the new AA mode is applied, and the FPS climb again to a healthy 15-20.When the cloud density is lower I do the same to set back 4xS.Maybe a gifted add-on developer can build a utility that makes the trick more user friendly, what about a cockpit gauge that lets you switch the AA mode with a simple click ?I hope someone found this useful.Camilo.

I thought the major difference between 4x and 4xs was the alpha channel?I have a 5200FX card and routinely run at 2x AA vs 2xQuincrux because I don't need to AA the cloud textures.I may be wrong, but to me there isn't much difference on the ground between 4x and 4xs.At least to these eyes.....

There is a difference, 4x is not bad but you can see jaggies on some angles. At 4xS everything is fine, zero jaggies.For example the default Cessna 182 has some lines painted on the sides, at 4xS they are straight but at 4x you see the jaggies.Some planes also use alpha textures on their liveries and they look bad at 4x.

>For example the default Cessna 182 has some lines painted on>the sides, at 4xS they are straight but at 4x you see the>jaggies.>>Some planes also use alpha textures on their liveries and they>look bad at 4x.AA smooths polygon edges - AF is what smooths textures...