PCI X + SCSI

[TunaBoo]

I am about 3 days away from finally getting a u160 SCSI controller. It supports 66 MHz and 64 bit. Of course because I have a "normal" mobo I will be limited to 110-133 MB's a second. In the future, this card should work in a PCI-X slot right? What would it be limited at? Any higher, or still 110-133?

 

[dowxp]

what is a pci-x slot? i doubt it would even reach 133mb if you do not run raid.

 

[TunaBoo]

<< what is a pci-x slot? i doubt it would even reach 133mb if you do not run raid. >>



PCI - X is &quot;supposed&quot; to replace PCI slots in like 2003 or 2004. Who knows what will really happen.


I hope to (by then) have several 15k (or 20k) drives, and would like all the overhead I could get.

 

[dowxp]

its unliekly you will have the same scis card. by then, ultra4 and above and serial ata will be roaming the markets. but eh. dont worry about it now. technology now will be surpassed. focus on today, not the future.

 

[TunaBoo]

<< its unliekly you will have the same scis card. by then, ultra4 and above and serial ata will be roaming the markets. but eh. dont worry about it now. technology now will be surpassed. focus on today, not the future. >>



I am a poor college student for 4 years. I need my $200 SCSI card to last 3 years.

 

[dowxp]

haha, yeah right. =) might as well get a proc to last you too for 4 years. =)

 

[GoSharks]

my 2940UW is still going after probably 4+ years... i think it has a 1994(6?) or something bios on it. really old, and still in my main comp working hard

 

[TunaBoo]

Owned

 

[SCSIRAID]

PCI-X is backward compatible with 64bit 66mhz but.... Putting a 64/66 card in a PCI-X slot makes the bus (including all slots attached to that particular bus) downshift to PCI mode. Ultra 320 SCSI cards using the LSI 1030/1020 and the Adaptec 7902/7901 will support PCI-X.

As to limitations... The 64/66 card you describe (Adaptec 29160 I would assume?) can burst data at 133MB/sec in a 32/33 slot. What you actually transfer at depends on what drives you have on the card. In a PCI-X slot or a 64/66 slot your limitation would be 528 MB/sec since that is the speed of a 64/66 slot. PCI-X defines bus speeds of 66/100 and 133 Mhz (528/800 and 1064 MB/sec). Note that at 133Mhz you only get one slot per pci bus.... not cheap!!!