On Fri, Apr 07, 2006 at 09:02:45AM -0400, Lennart Sorensen wrote: > On Fri, Apr 07, 2006 at 06:57:06AM +0200, Francesco Pietra wrote: > > In setting up a workstation with > > > > --two amd6a 265 opterons dual core > > --Tyan K8WE S2895SA3NRF main board > > --two 360GB raid1 hd (raid 1 software by debian) > > --ram 2GB (Kingston KVR400D4R3A/2G - DDR 400 Ecc Registered), is any reason > > to > > prefer two slots of memories 1GB each instead of a single 2GB slot? > > > > The technician here maintains that two slots are needed to have needed two > > channels. > > > > Incidentally, the 2GB Kingston is charged in Italy six hundred euros, that > > is > > more than twice the price in US. This is to recognize that we can > > circumvent > > the market leader software houses (and be more efficient) but we cannot > > avoid > > the system in our country which favors handlers against citizen (and > > against > > scientific research activities). The results of such policy are under the > > eyes. > > With 2 * 1GB, you get 6.4GB/s memory bandwidth. With 1 * 2GB, you get > 3.2GB/s memory bandwidth. I think that is a reason to prefer the > pair 1GB sticks > > Socket 939/940 AMD's have dual channel memory controllers to get double > memory bandwidth, but only if you put in at least two sticks of memory > (and into the right slots on the board).
Actually since you are using 2 cpus, you really would want at least 4 sticks of identical memory to get full performance from the system since each cpu has a dual channel memory controller. You need need memory in each channel of each cpu if you want the maximum performance. Len Sorensen -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]