Sorry, but this is why you don’t ask an editor a technical question.
Yes, 7200 RPM drives are fast enough to push DV25, DV50 and even 1:1, maybe not across the entire spindle but a good portion of it.
It comes down to the card. If you try and use a budget promise card with its crappy onboard RAID options, you’ll come out on the short end.
If you want to use your internal SATA drives and the card you currently own, don’t RAID the drives. Config them as individual drives. If that doesn’t work try the Promise SATAII150 TX4. I’m having great luck with this card. DV25, DV50 and uncompressed on Windows stripe sets and individual drives.