Contrary to popular belief all sun monitor are not fixed frequency or odd ball res. Many of them are PC compatible and require just an adapter plug from 13W3 to vga. Some even have the vga plug. If they are PC compatible the seller will usually say but sometimes they do not. Check the horiz freq range. If it is from 30Khz to 85Khz or more it is a multisync monitor and can be made to operate with your PC. I used a sun 17E20 and I make one small change to get comp sync from the separate Horiz and Vert syncs and it worked fine with my PC.
Look at the specs and details given. If you look up the specific model number on the web you can sometimes find more into. Be careful however as most of the specs are supplied my a monitor database maintained my a company that sells expensive fixed freq cards.
Remember if the monitor operates in a Horiz Freq RANGE then it is not fixed frequency.
There are alot of deals because alot of people say SUN! cannot use that on my PC. (WRONG)
BobA