Right off the assembly line

I wish to buy a Ultrabook, but I need some to choose the right one.

1. Can anyone explain about the performance difference in having an SSD cache (along with classical HDD ) and one with SSD replacing HDD ( with no classical HDD ) (I know that this is to boast the performance but how far ? , and how does SSD cache thing compare with the normal HDD laptops ? )

2. What about the compatibility of the SSD cache with Linux ? ( Since I wont be using windows I just wanted to know If the SSD cache works with any proprietary software which is compatible only in windows or I can make use of this cache in Linux too ? )

3. Which is the best ultrabook under 65K ?
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