quick correction, i said PCI max sustained transfer rate is 132Mb/s which should have been 132MB/s (ie. bytes not bits).
so (theoretically) a PCI bus at 132MB/s should be able to cope with a UDMA drive of 100MB/s. bear in mind that you are unlikely to achieve the 100MB/s because the bottleneck here will likely be the drive, and the max transfer rate will only be reached in bursts (for a single drive). having a large cache helps to keep the bus busy. also (afaik) the 100MB/s is for all drives in the chain (i'm not 100% certain on that tho), so the bandwidth will be shared between all the drives. thus having 2 drives in a simple RAID array wont magically give you 200MB/s (because the IDE bus wont support that and neither will your PCI bus). but it can speed up access over a single drive if you're using striping as the controller can share out work between the drives so they're both working at the same time. ph. > Ah yes, you're right again!! (I think!) > > So what's the point in having UDMA 100 Hard drives etc? > > Nick. > > > p.s. The memory isn't DDR... I don't know exactly how or why the memory > speed is doubled.. But it is! > > > > -----Original Message----- > From: ph. [mailto:[EMAIL PROTECTED]] > Sent: 10 December 2001 14:55 > To: Drum & Bass Arena Discussion List > Subject: [dnb-prod] Re: Computer Check: Need your advice > > > that'll be memory bus speed (266MHz effective). pci bus is only ever 33MHz > (unless you overclock it but even then you wont get it over 40MHz afaik). if > > your controller is on the IDE bus then its maximum sustained bandwidth must > be 33MHz * 4 (32 bit bus) or * 8 (for servers with 64 bit PCI). which 132 > Mb/s maximum transfers for all devices on the PCI bus. AGP is a separate bus > and runs at 66MHz standard so shouldnt interfere with PCI bus transfers. > > as for the 266 speed of your memory bus, that'll be it sending on the rise > and fall of the clock signal so you get twice the transfer rate (ie. DDR for > > Double Data Rate). > > ph. > > > ----- Original Message ----- > From: "Nick Lankester" <[EMAIL PROTECTED]> > To: "Drum & Bass Arena Discussion List" <[EMAIL PROTECTED]> > Sent: Monday, December 10, 2001 2:50 PM > Subject: [dnb-prod] Re: Computer Check: Need your advice > > > > Yeah, the bus speed on my MB is 266... (it's an Abit KT7A RAID).. It's > > actually 133 but it uses some kind of fruity technology to double it.... > > > > I don't see why that would be a requirement to get 200 out of your hard > > disks though? > > > > -----Original Message----- > > From: David Gover [mailto:[EMAIL PROTECTED]] > > Sent: 10 December 2001 14:47 > > To: Drum & Bass Arena Discussion List > > Subject: [dnb-prod] Re: Computer Check: Need your advice > > > > > > > Not only does this double (or more) the total bandwidth between the PC > and > > > Hard drive (eg. 2x ATA100 EIDE Hard drives on a RAID array will give a > > total > > > transfer speed of 200mhz!), > > > > Only if you have a motherboard with a 266MHZ PCI bus.. are they out yet? > > > > > I've just setup a 2 disk array using IBM Deskstar 60's (7200rpm > ATA100).. > > > And the speed is insane!!! > > > > At least you didnt use 75 GXP's :) > > > > > I don't know if you can do a similar thing with SCSI but if you could it > > > would (I guess) be a little faster still (not that you'd probably need > > > it!).. > > > > Yeah you can do RAID with SCSI. > > > > -dave > > > > > > --- > > Drum&Bass Arena Producers Discussion List http://www.breakbeat.co.uk > > You are currently subscribed to dnb-prod as: [EMAIL PROTECTED] > > To unsubscribe send a blank email to > > [EMAIL PROTECTED] > > This document should only be read by those persons to whom it is addressed > > and is not intended to be relied upon by any person without subsequent > > written confirmation of its contents. 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