We recently upgraded the IOS for a 720 card in a 6509 to a modular version of the IOS. The new IOS is running at 56% memory utilization which is higher than the 30% we had with the previous version of the IOS. Does the modular IOS use more memory?
You can refer the following URL for the memory requirement for 720 card in 6509 chasis.
Yes, modular IOS require more memory than an IOS.