On 11/12/10 12:21 PM, Keith Roberts wrote: > On Fri, 12 Nov 2010, John R Pierce wrote: >> that sounds quite likely. some of those modules have two banks on the >> single module, and I seriously doubt a system is going to like a single >> bank and a dual bank module in a dual channel environment. >> >> I got in the habit a long time ago of *always* using >> matched memory modules. > I've learnt my lesson now John. > > Well at least I won't mix hi and lo density modules again. > > Here's the link for my Asrock m/b: > > http://www.crucial.com/uk/store/listparts.aspx?model=K7S8XE%20R3.0 > > It does not support dual channel memory. no, but look at these constraints on the memory vs cpu FSB speeds http://www.asrock.com/mb/overview.asp?Model=K7S8XE *CPU* - Socket 462, supporting AMD Athlon, Athlon XP, Duron - FSB 400/333/266/200 MHz *Chipset* - SiS^® 748 *Memory* - DDR non-ECC, un-buffered memory - DDR400, Max. capacity of system memory: 1GB (FSB 400/333 MHz)* - DDR333, Max. capacity of system memory: 2GB (FSB 400/333/266/200 MHz) - DDR266/200, Max. capacity of system memory: 3GB (FSB 333/266/200 MHz) *According to SiS^® official document, SiS^® 748 chipset has limitation DDR supports: CPU at FSB 200MHz mode, it will NOT support DDR400 CPU at FSB 333MHz mode, it will NOT support DDR200 CPU at FSB 400MHz mode, it will NOT support DDR200/DDR266 I don't know which CPU you have, but, for instance, if its a 400Mhz CPU, you can't use 200/266 memory, and if you're not using 200/266 memory, you can't have 3 dimms at all. Your PC2100 is 266Mhz memory. And let just toss out that I personally would scrap any motherboard containing SiS (or VIA) chipsets in a blink if it was giving me any trouble at all. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20101112/179e1918/attachment-0005.html>