Thanks for the tip :-)
I already checked glxinfo and it seems that my card doesn't support this extension, but I decided to ask, just to make sure :-)
Well... Looks like it's time to say goodbye to my red, sexy Gainward and get something newer :-)
Just a small update!
I noticed this one, little thing while browsing delphi3d.org...
As you can check this report for GF4TI 4200 doesn't have GL_EXT_framebuffer_object listed
And the same card with the same caps. just different driver version:
seems to support that extension...
So maybe it's not the matter of hardware, but software ?