Centris 650 and Quadra 650Low End Mac Reader Specials
The Centris 650 has 4 MB or 8 MB soldered to the motherboard; the Quadra 650 has 8 MB on the motherboard. Each has four SIMM sockets for memory expansion. With the rear of the computer away from you, you will see 4 SIMM sockets in the front center of the motherboard. Although you can fill each individually, if you match the speed and capacity of paired SIMMs, the 650 will use memory interleaving, which can be 5-10% faster. Each RAM socket can be filled with a 4 MB, 8 MB, 16 MB, or 32 MB SIMM - they need not be of the same capacity, although you must use matching pairs to take advantage of memory interleaving. (There is no support for 1 MB, 2 MB, or 64 MB SIMMs.) The 72-pin SIMMs must be 80ns or faster. For best stability, all SIMMs should be of the same speed. Unlike earlier Macs, there is no need to put higher capacity memory in a specific bank. VRAMThe 650 ships with 512 KB VRAM on the motherboard. You can upgrade this to 1 MB by installing two 256 KB VRAM SIMMs in the VRAM sockets beneath the floppy drive. Special Resource: Interleaved Memory in the Centris & Quadra by Dale Adams <go to memory upgrade index, Centris 650, or Quadra 650> Low End Mac is an independent publication and has not been authorized, sponsored, or otherwise approved by Apple Inc. Entire Low End Mac website copyright ©1997-2012 by Cobweb Publishing, Inc. unless otherwise noted. All rights reserved. Apple, the Apple logo, Macintosh, iPad iPhone, iMac, iPod, MacBook, MagSafe, Mac Pro, Apple TV, and AirPort are registered trademarks of Apple Inc. Additional company and product names may be trademarks or registered trademarks and are hereby acknowledged.Advice is presented in good faith, but what works for one may not work for all. Please report errors to . LINKS: We allow and encourage links to any public page as long as the linked page does not appear within a frame that prevents bookmarking it. Email may be published at our discretion unless marked "not for publication"; email addresses will not be published without permission, and we will encrypt them in hopes of avoiding spammers. Letters may be edited for length, context, and to match house style. PRIVACY: We don't collect personal information unless you explicitly provide it. For more details, see our Terms of Use. |
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