[creatura85]

Yes that is my GPU`s memory .

Well i did open Graphics and Monitor inside Yast and i can see that the actual settings are present:

resolution: 1280 X 1024 SXGA(i suppose it stands for my LCD monitor) and 24bits
monitor : GSM LG ELECTRONICS L1918S it is also added from a large list of monitors but if i go to LG section of the list my monitor type 1918S is not present(the last version is L1811S). One more thing to add: in the list there is a category called LCD that has an arrow beside it and in that list there are plenty of resolutions using the 60 and 75 Hz refresh rate. Should i use it?

Then i have reached the Sync Frequencies tab :
for vertical is between 50 -75 Hz
for horizontal is between 30 -83 Khz

My Nvidia X Server settings shows at the resolution that i have to choose between 60 and 75 Hz .

Do you thins it is wise to set the horizontal sync freq to maximum 75 as the vertical sync freq ? And another thing inside the Nvidia X Server settings my LCD monitor is configured as a CRT (weird ...)