I have an S3 Virge GX. This card would like to overclock, the default speed is 60MHz. no matter what I do with MCLK I get instant artifacts. I also overclocked several S3 Virge DX cards above 60 MHz, which worked fine with MCLK without artifacts. Does MCLK work differently with an S3 Virge GX than a DX or do I have to use a different program? I work with Dos 6.22. See the photos which card it is and is there edo or sgram on it? I think it's 40 nano memory.