[comp.sys.next] Performance Penality of Parity Memory?

tjb@IceCube.unh.edu (Thomas J. Baker) (05/22/91)

NeXTanswers states under caveats of parity memory:

"There is a speed penalty for accessing parity memory, since for each access a  
parity check sum must be computed.  This translates into slower overall  
performance."

Can anyone speak from experience about this performance degradation?  It's time  
to buy some 4Mb simms and I figured someone out there must by now have some  
parity memory installed.  It is noticable?  Is it 10%?  

Thanks for any info...

tjb

--
+-------------------------------------------------------------------+
| Thomas Baker                           Voice: (603) 743-4987      |
| P.O. Box 213                                                      |
| Durham, NH 03824           Internet/NeXTmail: tjb@IceCube.unh.edu | 
+-------------------------------------------------------------------+
-- 
+-------------------------------------------------------------------+
| Thomas Baker                           Voice: (603) 743-4987      |
| P.O. Box 213                                                      |
| Durham, NH 03824           Internet/NeXTmail: tjb@IceCube.unh.edu | 
+-------------------------------------------------------------------+