Its dual channel and they are in the right spot, I reseated them 1 pair in black 1 pair in white So are you guys saying my kernel should be supporting more than 4gb? On Mon, Sep 8, 2014 at 2:37 PM, <m.roth at 5-cent.us> wrote: > Jonathan Billings wrote: > > I cut out the text of dmidecode that weren't necessary for the point: > > > > On Mon, Sep 08, 2014 at 01:52:43PM -0400, Bob Metelsky wrote: > >> dime910 /home/robert :( # dmidecode -t 17 > >> # dmidecode 2.12 > >> SMBIOS 2.3 present. > >> > >> Handle 0x1100, DMI type 17, 27 bytes > >> Memory Device > >> Locator: DIMM_1 > >> Part Number: 64T256020EU2.5C2 > >> > >> Handle 0x1101, DMI type 17, 27 bytes > >> Memory Device > >> Locator: DIMM_3 > >> Part Number: CM2X2048-6400C5 > >> > >> Handle 0x1102, DMI type 17, 27 bytes > >> Memory Device > >> Locator: DIMM_2 > >> Part Number: CM2X2048-6400C5 > >> > >> Handle 0x1103, DMI type 17, 27 bytes > >> Memory Device > >> Locator: DIMM_4 > >> Part Number: 64T256020EU2.5C2 > > > > I couldn't find the Dell Service Manual for a 'Dell 770' but I was > > looking at the Service Manual for the Optiplex 760, and I saw that the > > way that the modules are paired isn't obvious. It looks like you've > > got 2 2G memory modules from 64T256020EU2.5C2 (Kingston?) and 2 2GB > > modules from CM2X2048-6400C5 (Corsair?). I suggest finding your > > service manual, and make sure that the modules are placed in the DIMM > > slots and the same vendor RAM is paired with its partner. > > > > It sounds to me like there might just be something weird going on with > > how the memory is installed. I'm assuming you don't have an > > artificial limit in the kernel command line or anything obvious like > > that. > > > Oh, Ghu.... I don't know about lower-end desktops, but in servers, they > *MUST* be *identical*, even to the point of not being able to mix dual > rank with quad rank, even if everything else is the same. > > mark > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos >