Same problem here, but my motherbord is ALi based.
My Sata controller (lspci)
SATA controller: ALi Corporation ULi M5288 SATA
uname -a:
Linux kubuvic 2.6.20-16-generic #2 SMP Thu Jun 7 20:19:32 UTC 2007 i686
GNU/Linux
Many people on the forum are experiencing slow sata...
An other problem
** Summary changed:
- Slow SATA HDD performance on Intel 82801G (ICH7 Family) chipset
+ Slow SATA HDD performance on Intel 82801G (ICH7 Family) nForce chipsets
** Tags added: nforce nvidia
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Slow SATA HDD performance on Intel 82801G (ICH7 Family) nForce chipsets