Groovymame bgfx too fast

[xbrunox]

Hi all I use the last version of groovymame. 214 with a 31khz PC monitor. I use groovymame because it can generate the modeline with the super resolution ex. 2560x480 with the correct refresh rate. The problem is that with the default settings I can't use shaders and the look isn'very good... Too much pixel! I can use shaders if I enable in video bgfx, but if I set bgfx (and groovymame don't use the standard d3d9ex) the games are too fast not in sync.
I use an aero combination in windows 7 64bit, and I've made a lot of test with throttle, syncfresh, ecc.

Thanks.