Hurrah Interface speed: 53 MB/sec
Took me 2 days to find out the problem and buying 3 SATA cards.
Anyway, my results:
Sil 3112A : Works but only in PIO Mode 4. Giving 11 MB/sec. None of the latest driver or BIOS upgrade for the controller helped.. seems like Silicon Image dont want to fix the problem.
VT 6421A: 1 IDE & 1 eSATA & 2 SATAs internal.
May work with latest drivers only i.e. 5.60 (old ones dont work) but only 1 port works at a time and I can't find a manual which will tell me how to turn the internal SATA ports on. I know its something to do with the onboard jumpers. Must also have non RAID mode drivers.
Sil 3512: Did as described by CDan & zebadee.
Using RAID drivers gives 11MB/sec PIO mode 4, but using IDE base BIOS & driver give 53 MB/sec.
Hope this post is useful to others.
BTW: NeroInfoTool 5 does NOT work properly with LG GGW-H20L (version 4 does).