cat 5.13 drivers. card is water cooled and unfortunately x800 volt mods are all hard mods, no bios joy. i did the pencil mod on the core and vdimm after many soldering mods in the past that, while much better and more flexible, are way more time consuming to do right.
thing is most of these GTOs with non-r430 cores (r430 cores are on all X800xl and now on some 16 pipe GTO2s and don't o'c well at all) get in the high 500s, so these really are great/cheap cards.