Date: Wed, 10 Jul 2002 16:32:27 -0700 From: Darren Pilgrim <dmp@pantherdragon.org> To: Terry Lambert <tlambert2@mindspring.com> Cc: a clever sheep <freebsd-chat@aard.org>, freebsd-chat@freebsd.org Subject: Re: 2u freebsd box and riser card drivers Message-ID: <3D2CC40B.AAB21291@pantherdragon.org> References: <20020710155003.GC500@malkavian.org> <3D2C9C2F.91398132@mindspring.com> <3D2C9E93.A8EBBD81@pantherdragon.org> <3D2CA2D6.E387A2D@mindspring.com>
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Terry Lambert wrote: > > Darren Pilgrim wrote: > > > They are just wires and connectors to extend the wires and connectors > > > already there. No drivers necessary. > > > > > > On a related note, I've been looking for a 1U case and riser that can > > > handle 2 cards (one right-side-up, the other up-side-down), i.e. the > > > cards go on opposite sides of the riser, with their connectors facing > > > each other: > > > > Would the connectors being that close to each other impact signal > > timing? > > Does having adjacent connectors that close together on the motherboard > impact signal timing? 8-). > > If you don't like the idea on that basis, then I could live with > right-hand riser to go with a seperately purchased left-hand riser; > I can get a left-hand riser anywhere... I didn't say I didn't like the idea, I just know that trace lengths affect timing and that on a bus-type interface, timing is important. Perhaps at 33/66MHz it doesn't really make a difference. > I think the biggest issue will be that the card will end up facing > chip-side-down rather than chip-side-up, as for most cards, so the > heat disapation will be towards motherboard components that may > also want to be disapating heat into the same small areas there, > between-card-and-motherboard. > > I think you can make the argument, though, that you will have that > same problem with any card, even if it's right-side-up, because of > it being parallel to the motherboard and the case top. I would have thought that putting the cards chip-side down would allow for simpler cooling as all the hot components would sit more or less in the same air path. In a thin, wide space like a 1U, more air along one would probably be easier to do than adding seperate air paths. > Now to find a motherboard that can handle 1G SIMMs, where the SIMM > connector hardware is at a steeper angle than normal so that you > can fit 4G in a 1U case... ;^). You know, there's a point at which all this extra hardware will demand a 2U case just so you can use larger fans. :) Or have you found a company that will make small electric turbofans at a reasonable price? I've seen 1-inch turbofans that pull no more juice than the average 80mm case fan and can move 170CFM when unobstructed and running at nominal speed. I just wouldn't want to put one in my desktop. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-chat" in the body of the message
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