Cooked old lady's puter part 2 (K7S5A board question)

Memory refresher: I cooked the AMD 1.40GHz cpu on wife's K7S5A MB
Current status: Back's sore from sleeping on the couch

I went to the place where she bought the system (a different city of course)
to get the fastest cpu I could get for the 266-fsb. He asks which version of
K7S5A is it? There is nothing on the board, the bill or the box to indicate
it is anything other than a K7S5A so I say, you installed it you tell me (it
replaced a failed K7AMA so it's still under warranty). He can't be sure but
he looks on the web and tells me the fastest chip I can put in it is an XP
1800+ which he doesn't have. I come home and look up the MB and find this...
http://www.ecsusa.com/downloads/k7s5a.html which seems to indicate it'll
take a 2600+ cpu. Is anyone familiar enough with this MB to clue me in as to
what's what?