Well, if you'd looked at the links below (of the above link) all the dates are provided.
There's a link entitled: 'Pentium 4/1300 to 3066 MHz: November 2000 to date'
And another link: 'Athlon 650 to 1400: June 2000 to June 2001'
Note the above overlapping dates.
The table shows a Athlon 1333Mhz with a score of 114, while the closest Intel CPUs were: the PIII 1.2Ghz (score: 112), the P4 1.3Ghz (score: 110) - & the Celeron 1.7Ghz (score: 119).
hinchie Y2K III, how much closer do you need than that?
Unless someone else has done/will do such research with specific dates we may never know. You may find something in the archives of online PC mags - surely someone must've published a head-to-head CPU test at the time - worth exploring if you REALLY need to know.
Diodorus Siculus came as close as one could get - well done to him. Also, well done to Tom's Hardware. Where else can one find such info? If anyone does please do post the link here! Thanks.
Crossbow7 - I only knew, because I was buying a PC when the AMD 1333 was pretty much top of the range and I agonised about getting the PIV 1300 for a rather large premium. I went with the AMD1333 and still have it - extra hdd, new CD-RW, new sound card, more RAM, but the same processor and no reason to change it.