Here are the generic settings I use for most old crap screens attached to various cluster node machines. When you specify h and v frequencies for the monitor X won't back down to 640x480, unless of course that's all the frequencies can support.
I managed to track down a MonitorsDB file from sometime this year and it had an entry for this particular monitor. I ended up with:
Section "Monitor"
Identifier "Monitor1"
VendorName "Proview"
ModelName "570"
HorizSync 30-70
VertRefresh 50-150
EndSection-- Andrew Gaffney
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