Until those fans meet the 12V and 1Amp/header criteria - you are good to go! But, that's the point of the big fans... to spin slower and deliver the same amount of air as the smaller ones does at higher RPMs... usually lower speed means lower noise...

billyray.......your case came with the following fans:-

Fan Position Size RPM Loudness CFM Power Amp

front 230x30 700 19dba 110 3.36 0.16
top 200x30 700 19dba 110 3.36 0.16
side identical to immediate above
back 140x25 1000 19dba 61 1.68 0.14

There is a position on top for a second 200x30. The 230x30 has similar figures as it is almost the same fan (even to impellor length), and has the same holes ......they are actually 230 x 200 x 30, and have slightly beefed up sides with the goal of preventing some vibration.

As to your quiery.......none of these fans will strain the max amperage of any of your MVE fan pin outlets.......the 3 top fans (in the list) have a max of 700 rpm, are reasonable quiet, but at the same time move a very decent quantity of air.

Yes there is a reason. You have mentioned standard in bios...that will slow the fans . There appears to me to be a two way control of fans on the M5E. Most of the thermal controls in this motherboard are controlled by the super IO chip, which is a Nuvoton NCT6779D. Fans can be controlled either via PWM or DC. In the bios I think Q fan turns on PWM. Your fans are not PWM so I would turn that off and run Fan Xpert 2 in the AI Suite. You can then run the fans at 100% if you wish and make a save, Fan Xpert 2 will over-ride the Bios control and will run CPU fans with a PWM outlet and control the rest in a DC method. Have a play with that and yell if you can't figure it out. What CPU cooler are you using?

billyray, those 84 degrees are Celsius of Fahrenheit?! Because for Celsius is way to high!!! Also, be sure that you're watching the core temps...