people use the raid board because they either want raid, or an additional 2 channels of IDE.
Raid does not help in overclocking, and often will not give performance gains over a single fast drive of today's standards.
If you are going to (IDE) raid you have 2 choices overall, athough I think most mobos support only 1. The main option is raid 0. This striped data across 2 HDD at the same time, theoretically speeding access to the disks. It also has the advantage of providing a data volume almost 2x the size of the individual disks.
The other less frequent option is raid 1, where you can mirror the HDDs and acheive a limet amount of fault tolerance. Should 1 HDD fail, you data should still be safe on the 2nd.
For both options you should really use identical drives. You can use different ones, but you'll be limited to the factor of the lowest spec drive. i.e. if you mirror or stripe a 10 and a 30 drive, you'll only get 10 or about 17GB respectively. Also if youre drives are different speeds, the slowest will be the one that is the key.
There are other options, JBOD or spanning, where the controller logically extends on disk to a second physical disk. This allows you to have large volumes on different sized disks and even different speed, but is generally just a fudge hack and of little real world aid. Also higher levels of raid exist, but get more complicated and are beyond the needs of most gamers or home PC enthusiasts. If you have many many Gigabytes of data and require very fast access times you might consider mid level Raid 10 or 5 IDE arrays or optimally SCSI arrays - but you'll invest a lot of cash in those...
In answer to your actual question then, RAID0 on your 2 disks will give approx. 17GB volume at the access speed of your 10gig drive.
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