We ran 2 sticks of 128MB at 133MHz, with a 700E overclocked to 933 with more headroom left. I have not tried 3 DIMMS on neither 815E Pro and CUSL2, we didnt need to. 2DIMMs are enough for everybody.
While I do agree, the Asus board capable of doing 3 DIMMs 133MHz is certainly impressive, and it definitely is a positive thing. But I will wholeheartedly disagree that the MSI board not capable of running 3 DIMMs 133MHz is a con. Why? Simple, because its not their fault, its a limitation of the i815E chipset itself and they're not obliged to get around it, nor should they be blamed for that. I applaud Asus' effort to get around the limitation, but I just dont think its fair to blame that on the MSI.
The MSI has more than just the price, it's got a couple of features that the Asus doesnt have, again, for the Nth time, their D-LED and FuzzyLogic. Most importantly the clearance around the socket, which is one of the severe disadvantages of the CUSL2. Since you always quote Gamersdepot for their excellent Iiyama review, I suggest you refer to their 815E Pro/CUSL2 reviews, there is a reason why they gave the MSI 6 drips and the Asus 4.5.
815E Pro review
"Looking at the screen below you can see that we were able to crank up our PIII 933 up to a 149Mhz Bus, which yielded an overall clock speed of 1043!! This is the furthest we?ve been able to take any motherboard to date in the GD labs with just standardized cooling!"
"With the best overclocking ability we've seen to date, very robust features, and plenty of expansion slots, the 815E Pro has now become our point-of-reference i815 board to which others in future reviews will be judged by."
CUSL2 review
"The only thing that could potentially be in your way is the hefty capacitors that may prohibit you from slapping on some of the larger heatsinks out there."
"Overall, ASUS has another winner on their hands in terms of great stability and having a full set of features, however it didn?t quite clock up as high as the MSI 815E Pro did that we looked at last week."
CUSL2.com is a great web site, I never refuse to take a stand on that. If I have the money and resource I'd be glad start the 815epro.com.