At KORD R32/default baron 58 I get 14-15 fps at start of T/O, when I reach 2000-2500 ft FPS= 25 to 28 as long as I stay in straight Flight. After being in a turn for a minute or so I start getting stutters ,yet fps are still around 20, then I may get a freeze for a few seconds and FPS drops to 1 or 2. I hear a pop in audio when this happens, then it picks up again toaround 25 fps for awhile then starts over. FSX on D drive alone 85 gig. Total page file for 2 drives=4093.IN TWEEKS those in [ ] brackets are present settings.Tweeks= Buffer pool size 5000000 ,[6000000] & none.--(Texture)Bandwidth 340 & [140]--(Main) [Fiber-Frame etc to 0.20]--Renamed Default.xml to [.bak].Target set at 18 & [unlimited]Some tweeks give a greater fps & more large stutters then others.Dell P/4--3ghz--Windows xp w/sp2--2 gig Crucial DDR400 mem--Ati Radeon x1600 Pro 512 mhz video--400 watt P/S/dual fan-- Extra Fox Exhaust fan--Latest ATI Drivers 6.14.10 & Catalyst 6.12Grap=1024x768--Global res=medium--Filtering [Trilinear]--3D cockpit--Scenery= detail medium--mesh complex 70--mesh res 38m--tex res 2m--water low 1.x--scenery complex Dense--Autogen Normal--Spec effects Medium--WX Global Med High--detail clouds Density Medium--Traffic Airline 50%-Gen Av 10-apt veh Minimum-Road,ships & Boats =10.Does anyone have same setup and has cured stutters & freeze up ???Thanks Chuck

In My original post I forgot to mention that the Ati card is an AGP and my BIOS is set at 256 which is as high as it goes. Thanks in advance for any help. Chuck