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Question about onboard SCSI

S

Sideswipe001

Golden Member
It's rather a simple question. I just wondered what bus the on-board SCSI interfaces were connected to (most likely). Our work server here has 32/64 bit 66 mhz PCI slots; so I assume that it would have the same bandwith as a 64bit/66MHz PCI SCSI adapter would. Is that correct? Or is it faster to buy a SCSI adapter that's not built in and use that?
 
The real answer is depends on the board designer and the chipset used. If you don't have the time to do the research, I would assume that it is tied to the PCI bus and if it is a true server class board then I would say it would be a 64 bit PCI interface.
 
It'll also depend on what else is riding the PCI bus, since it would have to drop to 33MHz if you plugged in a 33MHz card (such as a cheap 10/100 NIC) on the same bus. If you're asking the performance question, also make sure you keep your slower SCSI devices (say, an Ultra2 tape drive) off the SCSI channel that you need good performance from.
 
As the others said, it mostly depends on the SCSI chip used on the mobo. You can find the chip number out and look up the specs on the mfr's site. Since it is a server mobo, the mobo mfr usually has pretty complete info on the web site - more than for the typical consumer grade mobo.
.bh.
 
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