fsfacca@lerc08.nas.nasa.gov (Tony Facca) (04/30/89)
>We have several Iris 4D 20's and a 4D70 and they all want to have >their memory upgraded, but SGI wants lots and lots of money to do it. >The memory seems to be in the form of 1Meg simms. What is the preferred >>We recently bought several IRIS 4D 20's with 8 meg of memory and then upgraded >>them to 16 meg ourselves. SGI wanted about $ 1200 a meg for memory and we >>paid $ 310 a meg on the open market. We just specified 1 meg SIMMS, 100 nsec, Just wanted to add: Another company, "ClearPoint" sells the SIMMS for the 4D/20's but it was my impression that there was some difference in the SIMMS for the 4D/70's, making them unavailable on the open market. Has anyone else heard this? -- ----------------------------------------------------------------------------- Tony Facca | phone: 216-433-8318 NASA Lewis Research Center | Cleveland, Ohio 44135 | email: fsfacca@lerc08.nas.nasa.gov -----------------------------------------------------------------------------
rbriber@POLY1.NIST.GOV (12/03/90)
We have a Iris 4D80GT running 3.2.0 with 16 megabytes of memory. The memory is in the form of 16x1 megabyte SIMMS on the system CPU board which is now full. We have heard two conflicting reports about adding more memory. The first is that once this board is full we need to buy a new board for memory (many $) and install the new memory on the new board. We have also heard that we can remove the 16 1 Meg SIMMS and replace them with 8 4 Meg SIMMS to give us 32 Megs and still have the possibility for adding more memory in the future. Even though we loose the 16 1 Meg SIMMS the method of upgrading to 4 Meg SIMMS is significantly cheaper than buying another board. Does anyone know whether the system architecture will support this swap? Also does the kernal have to be reconfigured after the memory upgrade or will the system figure things out on it's own after adding the new memory?
mea@sgi.com (Michael E. Anderson) (12/06/90)
The SGI 4D/80 "architecture" does support use of 4Mb DRAM SIMM's, but the actual hardware implementation of the main memory system will not support more than 16MB of local (to the processor board) main memory. Main memory may be expanded in 16MB increments up to a maximum total memory size of 144MB by installing main memory expansion boards (32MB per memory expansion board). Up to 48MB could be installed on the processor board using 4MB SIMM's if 2 PAL's were changed to modify the RAS decode. This has never been done at SGI and I am not aware of any plans to do so in the future. The kernel should be able to find any amount of main memory present up to 144MB (?256MB?) regardless of the type. Mike Anderson Advanced Systems Division Silicon Graphics, Inc. Mountain View, CA 415 962-3437
stein-c@acsu.buffalo.edu (Craig Steinberger) (05/15/91)
We are considering buying a memory upgrade for a 4D/310-GTX. Does anyone
have suggestions on a 3rd party source? I've heard of two companies
(Parity and Falcon Systems) but don't know how good they are. Any help,
suggestions and warnings would be appreciated.
--
Craig Steinberger stein-c@eng.buffalo.edu
SUNY at Buffalo, Computational Fluid Dynamics Lab