Dell PERC 4/SC - Manual (Page 21)

If PERC 2/SC and PERC 2/DC are also installed in the system, the MEGA4_XX.HAM driver loads for AMI MegaRAID i960Rx Adapter.
You MUST remove all of these drivers before you install the PERC 3 driver.
2. Select each driver listed above and press to delete them.
3. Press to install the PEDGE3.HAM driver for PERC 3/DC or PERC 3/QC adapters.
Follow the instructions to finish driver installation, then select Device Drive summary and continue NetWare installation.
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NOTE: PEDGE3.HAM is the common driver for PERC 2/SC and PERC 2/DC adapters. You MUST use the same driver for PERC 2/SC and PERC 2/DC
adapters if they co-exist with PERC 3/DC or PERC 3/QC adapters.