I've just made several tests, comparing older SATA 1.x SiI3114
(32bit/66MHz PCIX), newer SATA 2.x JMicron JMB363 and SiI3132 (PCIe x1)
cards and on-board ICH8 AHCI with two fast drives connected to each:
Linear read with 1MB block from two drives, summary:
SiI3114 in PCI 32/33 slot: 120MB/s.
SiI3114 in PCIX 32/66 slot: 190MB/s. <-- near to SATA 1.x limit
SiI3132 in PCIe x1 slot: 150MB/s
JMB363 in PCIe x1 slot: 188MB/s
ICH8 AHCI on-board: 310MB/s <-- drives limit
So, faster bus can be a significant bonus even to old card. Inefficient
design can kill even new bus. Same time fastest internal connections of
ICH8, combined with effective design can give unique results.
Linear read with 512B block:
SiI3114 in PCIX 32/66 slot: 16Ktps.
SiI3132 in PCIe x1 slot: 17Ktps
ICH8 AHCI on-board: 17Ktps
10 streams linear reads with 512B block:
SiI3114 in PCIX 32/66 slot: 10Ktps.
SiI3132 in PCIe x1 slot: 25Ktps
ICH8 AHCI on-board: 25Ktps
But even slower newer card can win in some situations, just because of
additional functionality, such as command queuing in this case.
--
Alexander Motin
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