also i'm not sure this is a syncing issue or the graphic card is still outputting a 31khz signal
It's a sync issue. That signal is 15 kHz.
I've used my 6450 through an UMSA, it works perfectly here. I don't remind having to change any jumpers.
i, in fact, bought an hd6450 after read you did use it with success as i was struggling to make a good decision on what to buy as gpu
first of all thanks for the pointer, i was scratching my head really bad in the last three days
BigDaddy video talks better then my picture and is the exact same problem
the only difference is that my tv scrolls like two time faster, but i understand is the same problem just worse in my case?
in order to rule out what is causing it
it's a matter of Crt ( i should have a second one in my basement) and/or cables
thinking about sync signal on vga cable or on the scart one
or from software side since i'm using generic 15khz and there are setting that would suit better for my picky tube?
i'm also confusing about the crt quality since i have it for years now and it's pretty much able to work with all the retro console i'm using it with
ntsc or pal doesn't metter i always get crystal clear picture (usign rgb scart)
EDIT: got back the second crt from the basement and indeed show the same sync issue
am i safe to assume the crt isn't causing the problem?
i ran out of tubes :/