I have an Althlon 2400+ with sata drives with 8mb cache and I get the following 
when I run "hdparm -t /dev/sda"

/dev/sda:
 Timing buffered disk reads:  200 MB in  3.02 seconds =  66.24 MB/sec
BLKFLSBUF failed: Operation not supported
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Operation not supported

Don't know if this helps.
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