Date: Thu, 16 Aug 2007 11:20:50 -0400 From: Martin Cracauer <cracauer@cons.org> To: Johan =?iso-8859-1?Q?Str=F6m?= <johan@stromnet.se> Cc: Martin Cracauer <cracauer@cons.org>, freebsd-hardware@freebsd.org Subject: Re: Single Core2Duo Quadcore vs. two dualcore Xeon? Message-ID: <20070816152050.GA34616@cons.org> In-Reply-To: <4835BBD0-5FA9-4DE3-A60D-B7D04628B229@stromnet.se> References: <7A201B4E-9B61-4074-93B9-42BD23B35AA9@stromnet.se> <20070815153800.GA28807@cons.org> <4835BBD0-5FA9-4DE3-A60D-B7D04628B229@stromnet.se>
next in thread | previous in thread | raw e-mail | index | archive | help
Johan Strm wrote on Thu, Aug 16, 2007 at 02:21:46PM +0200: > On Aug 15, 2007, at 17:38 , Martin Cracauer wrote: > > >Johan Strm wrote on Thu, Aug 02, 2007 at 10:41:13PM +0200: > >>Hello > >> > >>I'm in the process of purchasing a new server. I'm currently looking > >>at two Supermicro based options, one with a Core 2 Duo Q6600 Quadcore > >>2.4GHz 2x4MB (on a PDSMi+ board) , and another with two Xeon 5110 > >>dualcore 1.6GHz 4MB (on a X7DVL-i board). > > > >Well, the 2.4 GHz will be faster than the 1.6 Ghz :-) > > Very true :) > > > > >The FB-DIMMs are bashed by some for high latency and maybe that's true > >if you use all slots. Personally I couldn't observe this, 667 MHz > >FB-DIMMs perform about as 667 MHz unregistered for me. > > > >However, the 775 platform allows you to either buy 800 MHz memory, or > >even overclock memory, so potentially you get much more memory > >bandwidth if you require it. > > Overclocking a server doesnt seem like a good idea, for desktop its > one thing but I'll rather keep my servers stable and secure than a > little faster Of course, I was just pointing out potential differences. And you have to test all this stuff after assembling it anyway. And the 800 MHz memory is official by now, but only for 775. > >The dual 771 platform also allow much more memory. I find 8 GB to be > >very tight these days. > > Yeah, from what I've understood thats the "strong" thing with FB- > DIMM... Able to take much more memory.. Actually standard registered memory (the "half-buffered" kind) did that just fine, at least in the AMD world where separate memory banks for each processor let you live with a maximum of 8 slots per CPU. But Intel just had to invent another new thing. > The Xeon Quad core just got a major price reduction though, so now > I'm looking at a dual quad xeon (with 5320, 1.68Ghz or 5330 2.0GHz) > instead... You still have to weight whether there is any application that you need that is not multithreaded. > The "default" mobo at the supplier (www.mullet.se) uses the X7DVL-i > board, which takes 6 FB-DIMMs on two channels (max out at 16 gig).. That math doesn't play. > But I'm thinking about getting the upgrade mobo instead, X7BDE, with > 8 slots on 4 channels with max 32GB (and also full KVM features in > the IPMI slot..) > > But I'm curious if this kind of platform will ever be able to use all > this? Disk access, memory bus & cpu etc.. lets asume I max this > system in the future with 32 gigs of mem and 8 2ghz cores.. Will I > ever be able to use that much with a raid5 (or 10, whats the lists > opinion on this? 5 or 10?) config on a PCI-X slot? Much of ... what? I can't parse this sentence. For a pure fileserver all this is overkill. > I think the disks > will be the limiting factor before the PCI-X is maxed out though.. Of course. > But realistically, for a php,mysql,apache,java etc machine with a > number of jails, i wonder if I will ever be able to use this much > power or if I should aim lower and if the box gets too loaded I'll > get another one.. The moment php and Java are involved you are not strictly disk-bound anymore :-) Martin -- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Martin Cracauer <cracauer@cons.org> http://www.cons.org/cracauer/ FreeBSD - where you want to go, today. http://www.freebsd.org/
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20070816152050.GA34616>