From owner-freebsd-chat Wed Jul 10 16:32:33 2002 Delivered-To: freebsd-chat@freebsd.org Received: from mx1.FreeBSD.org (mx1.FreeBSD.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 3A00E37B405 for ; Wed, 10 Jul 2002 16:32:31 -0700 (PDT) Received: from spork.pantherdragon.org (spork.pantherdragon.org [206.29.168.146]) by mx1.FreeBSD.org (Postfix) with ESMTP id 7F27E43E52 for ; Wed, 10 Jul 2002 16:32:30 -0700 (PDT) (envelope-from dmp@pantherdragon.org) Received: from spark.techno.pagans (spark.techno.pagans [4.61.202.145]) by spork.pantherdragon.org (Postfix) with ESMTP id EED20471DA; Wed, 10 Jul 2002 16:32:28 -0700 (PDT) Received: from pantherdragon.org (speck.techno.pagans [172.21.42.2]) by spark.techno.pagans (Postfix) with ESMTP id 8DEC3FF8B; Wed, 10 Jul 2002 16:32:27 -0700 (PDT) Message-ID: <3D2CC40B.AAB21291@pantherdragon.org> Date: Wed, 10 Jul 2002 16:32:27 -0700 From: Darren Pilgrim X-Mailer: Mozilla 4.76 [en] (Win98; U) X-Accept-Language: en MIME-Version: 1.0 To: Terry Lambert Cc: a clever sheep , freebsd-chat@freebsd.org Subject: Re: 2u freebsd box and riser card drivers References: <20020710155003.GC500@malkavian.org> <3D2C9C2F.91398132@mindspring.com> <3D2C9E93.A8EBBD81@pantherdragon.org> <3D2CA2D6.E387A2D@mindspring.com> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-chat@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org 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