very small terrain rings no matter what setting

hi all; I have fs9 on a p4 with 6800gt vga and terrain display is really smooth and crisp way to the unlimited horizon, no visual terrain loading when flying and no "rings" visible,however fs9 on my i7 950 6 gig ram with geforce 250gts 1gb, terrain rings are very visible and very small, constantly loading around me as I fly. I tried all terrain settings (same asthe old pc) as well as display drivers switching from older to latest ones.Old pc has a 22" vga @ 1600x1200x32 and new one a 30" pcie2 @ 2560x1600x32I searched the forums and the web w.o. succes, plz helpp@u!