phillips@sparky.lcs.mit.edu (Mike Phillips) (01/10/91)
We just got a bunch of SS2's and were having trouble figuring out if the 4Mbyte simms from our SS1's would work. I think the official Sun answer (as far as I could figure out from our salesperson) is no. Anyway, I tried them and they seem to be working fine. We've added an extra 16Meg of 4Meg simms to each of 4 SS2's and nothing terrible has happened yet. The simms we used are 80ns (well, I think so - they have a little "80" printed on them amongst a lot of other numbers). So, don't throw out that memory!! Mike (phillips@goldilocks.lcs.mit.edu)
karl@forest.gsfc.nasa.gov (karl anderson) (01/20/91)
In v10n13, phillips@sparky.lcs.mit.edu (Mike Phillips) writes: >We just got a bunch of SS2's and were having trouble figuring out if the >4Mbyte simms from our SS1's would work. I think the official Sun answer >(as far as I could figure out from our salesperson) is no. Anyway, I >tried them and they seem to be working fine. We've added an extra 16Meg >of 4Meg simms to each of 4 SS2's and nothing terrible has happened yet. >The simms we used are 80ns (well, I think so - they have a little "80" >printed on them amongst a lot of other numbers). My Sun "pre-sales" tech support guy told me that the SS2 was designed with very close tolerances for memory access time. Most "80ns" DRAM is actually 80 +/- 2 ns, but the SS2 will have problems if the access time is even slightly greater than 80 ns; "80 +0/-2" is the way he characterized the requirement. This is a matter of quality control in DRAM manufacture, so hopefully there are some open-market sources of certified "80 +0" ns SIMMs out there. If you have some, give them a try; if there are no problems, then no problem. When shopping for them, you should insist that the vendor warrant them for use in the SS2. Of course, you may pay a premium for this degree of assurance; you may even find that Sun's prices are competitive 8^). Karl A. Anderson | Internet: karl@forest.gsfc.nasa.gov NASA/GSFC code 923 (STX) | voice: (301) 286-3815 Greenbelt, MD 20771 | #include "std_disclaimer"
scs@iti.org (Steve Simmons) (01/23/91)
In v10n13, phillips@sparky.lcs.mit.edu (Mike Phillips) writes: >We just got a bunch of SS2's and were having trouble figuring out if the >4Mbyte simms from our SS1's would work. I think the official Sun answer >(as far as I could figure out from our salesperson) is no. I have spoken to several DRAM vendors at Uniforum, and all say that stock 80ns 4MB SIMMS work fine in the SS-2. Since most reputable vendors sell on a free-replacement-if-defective basis, you should be just fine even if individual compenents are out-of-spec.