   Fullscreen more slow than window mode
  I have a rate of 174 fps in 1024x768.When i change to fullscren i got  between 90 and 100 My adapter is configured to 100 hz of refresh rate.The rate in fullscreen would be of "100" -constant-Is this right? 
  You''re probably setting D3DINTERVAL_DEFAULT for FullScreen (as opposed to D3DINTERVAL_IMMEDIATE for windowed). ;  It''s correct. But why if my card can run at 174 FPS in window mode, setting 100 hz of monitor refresh rate down up "90"?The FPS must be 100 -static-Maybe the cards refresh rates isn''t constant.I got a Quadro FX500 ;  In windowed mode refresh rates probably dont matter since its the window that you are drawing to.  You can draw to it faster than the refresh rate of the monitor and the window might "update" itself that many times.  In one way of thinking of it, there is no vsync in windowed mode.When you are in fullscreen though, that''s when you are in control and it''s up to you to decide wether or not to wait for vsync or not. 