Hello Yes, it is compatible. There were issues with slot ID assignment when using a PERC H710(p) on several systems, including the R420. We stopped selling those controllers on the affected systems until a firmware update was released to correct the issue. This is likely why some locations list the controllers as not compatible. Thanks
I am looking to upgrade from an H310 Mini Mono in my PowerEdge R420 to an H710 512MB Mini Mono or H710P 1GB Mini Mono.  I have read some conflicting information as to whether the H710P 1GB model is supported by the R420.  Can anybody tell me with certainty whether or not the H710P 1GB is compatible with the R420?
Is the H710P Mini Monolithic compatible with the R420?