I have absolutely nothing whatsoever against overclocking. Is it supposed to be a kind of offense, insult, sin...?
Dry ice sublimates at −78.5 °C. That's too cold for eutectics with table salt (which in addition decomposes during electrolysis), glycerine (-38°C), propylene glycol (-60°C), ethylene glycol (Wiki gives -45°C but Huntsman and Dow Chemical stop measuring at --50°C, looks like -60°C), di- and tri-ethylene glycol (less good than mono-).
Found
ethanol at -120°C; -80°C would need 84% ethanol
http://en.wikipedia.org/wiki/File:Phase_diagram_ethanol_water_s_l_en.svgAnd
methanol, of which 70% achieve -82°C, the eutectic colder
http://www.engineeringtoolbox.com/methanol-water-d_987.htmlYou may have chances with some
acid as well. Highly concentrated, it prevents freezing and makes a good electrolyte. 38% sulphuric gives -73°C, so just check others.
I expect the alcohols to dissociate faintly and electrolyze little; anyway, they should recombine with water, so that only oxygen evolves. Then, you need something to ionize water but doesn't react with an alcohol. An alkali?
Please be careful with the alcohols, as they're all toxic. Ethanol is toxic, carcinogenic, mutagenic, teratogenic - the whole spectrum - methanol is worse, glycol is knowingly unsound. Many burn and are uneasy to extinguish.