Ok, as you see in my sig, my 9400 has arrived.

Got the Hitachi Travelstar SATA 7K100 (7.200rpms). I 've done a short disk benchmark with linux...both have disabled accoustic management, with the new i9400 it is now easier possible by the BIOS.
i9300 - 5.400 Fujitsu MHV 2080AH IDE:
Timing cached reads: 2892 MB in 2.00 sec = 1445,28 MB/sec
Timing buffered disk reads: 100 MB in 3.02 sec = 33,12 MB/sec
i9400 - 7.200 Hitachi HTS72108 (7k100) SATA:
Timing cached reads: 4424 MB in 2.00 sec = 2212,66 MB/sec
Timing buffered disk reads: 132 MB in 3.03 sec = 43,59 MB/sec

Marcus