Do Dell Perc Cards Really Support RAID 10

    I have a big question. I'm posting it at several reputable forums in hopes that someone out there knows an answer. I work for a company that uses a number of Dell Servers with PERC cards to handle our RAID configurations. Recently I was assigned the task of setting up RAID 10's utilizing the PERC 3/DC, which is the main controller we use. I happened to stumble across some documentation on the Dell website which states that "On the PERC 2/SC, 2/DC, 3/SC, 3/DCL, 3/DC, and 3/QC controllers, RAID-10 is implemented as RAID-1 Concatenated." According to Dell's definition of Concatenation earlier in this same article, "Data fills up the first disk before it is written to the second disk." In other words, in a true RAID 10 one gets redundancy because all data is mirrored on two hard drives but one also gets data access optimization because the data has been striped across all the mirrors. In RAID 1C (as I have dubbed it) you get redundancy because all data is mirrored but you lost the access optimization because the data is written to the first hard drive until it is finished, the it goes on to the second and so on. Not only is there a data bottleneck as data is written, but also when it is accessed because the data needed is not likely to be on multiple drives and thus all requests focus (generally) on only one drive, creating a bottleneck.
    We intended to upgrade to a 4/DC to overcome this problem, however I wanted to "triple check" that the 4/DC supported true RAID 10 and the 3/DC (etc.) did not. I called DELL and after spending over an hour on the phone with them was told that they were unsure whether either the 3 or 4 series of PERC cards supported true RAID 10.
    My question is, does anyone know? Does any PERC card support true RAID 10?
    Here is the Dell product page that states that the 3/DC supports RAID 10: http://accessories.us.dell.com/sna/ProductDetail.aspx?TabPage=techspecs&sku=340-2549&sp agenum=&category_id=277&brandid=&k=&c=us&l=en&cs=555&mnf=&prst=& prEnd=&mnfsku=&orderby=&searchtype=&pageb4search=&page=productlisting.aspx&i nstock=&refurbished=
    Here is the Dell Documentation page that states that 3/DC does not support true RAID 10: http://support.ap.dell.com/docs/SOFTWARE/smarrman/marb31/ch3_stor.htm
    Anyone who can clear up this question will be our hero.
David.

Thanks. The information on the boards there was really confused. But I ended up doing some benchmarking myself on a RAID 1 and RAID 10 as well as a local HD and was able to show that it appears to be true RAID 10, contrary to Dell's documentation.
David.