Very little chance.  Unless you have settings screwed up in your OS/application, then there is virtually no way that an H700 will suffer from the poor performance inherent in an H200, although I can't say or promise what kind of performance you will see.
We are using a R515 server with a H200 controller and a RAID5-array of 4 Sata disks with XenServer and some VMs. We are confronted with very slow disk i/o and are therefore thinking of upgrading to a H700 controller. If we do so, will it be possible to keep our current array with all data on it? Or shall we have to build a new array? thanksChris  
Upgrade Perc H200 to H700