It's superior Archon plate. To have it get 3 socketss it needs ilvl 35 or lower (I seem to recall) since it's an elite armour and superior it's from a monster or a vendor, it'll get 4 sockets no matter where you have larzuk punch holes in it.
If it was cracked or low quality or something, you could use the cube recipe to make it normal (giving it an ilevel of well I don't know, weapons get 1, don't know what armour gets, probably low)and then have larzuk punch holes in it. That would get you a lower number of holes. ( I think I may just try that on some sacred armour)