I can't afford an Athlon, but I did buy Enhanced Memory Systems PC 133 an have yet to find any article stating it's been bested. Then again I'm not lookin. The site below did a test using Munchkin. You can read the results here.
http://www.lostcircuits.com/motherboard/abitbh6/
Their site is at this address. Their may be a couple of good names in Memory out their. Some good reading at their site.
http://www.pc133memory.com/