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Thread: 128 MB Dimms in a 8600/300 Upgraded with Sonnet

  1. #1
    Join Date
    Aug 2002


    Hello again,

    I recently had a very bad experience with trying to use 8 128MB dimms in my Sonnet800 upgraded 8600/300. The machine also has sonnet tempo, tempo trio and adaptec 29160 cards isntalled in it. I purchased the memory from DataMemory ( because they are one of only two memory companies that I've dealt with and their 64MB has been good to me. At first, all seemed well and I thought I was well on my way to enjoying life in 1GB land. Unfortunately, I started having problems with the Mac "freezing" at the grey, smiling Mac screen, but never booting. I tried EVERYTHING in the effort to troubleshoot this problem. Finally, I relented and addressed what I suspected might be the problem all along. I took the new 128MB sticks out and put the old 64MB sticks back in and all has been well since. Any suggestions out there as to why I may have suffered this problem? Did I just buy the wrong memory? Or are there problems with doing this when other upgrades exists? The specs for the memory sticks are as follows:

    128MB 16X64-60 4K 5v Buffered 168 Pin DIMM

    Thanks for any help anyone can lend,


  2. #2
    Join Date
    Jan 2001
    Mobius Strip


    Is it possible that you ended up mixing EDO and non-EDO?

    A sample of from OWC's Legacy DIMMs page:

    <BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>128MB 168 Pin Mac 5V DIMM 60NS 4K FPM non-EDO (2K Per Bank) for Apple 72/73/75/76/85/86/95/9600; Compatible Clones. 100% Compatible with G3/G4 upgrades! New with Lifetime Warranty. (OWC5MD128MBG)

    5 Volt
    Fast Page Mode (FPM)
    168 Pin Mac
    1.15" Low Profile

    This memory module is compatible with the following computers:
    Power Macintosh Models
    7200, 7300, 7500, 7600, 8500, 8515, 8600, 9500, 9515, 9600 <HR></BLOCKQUOTE>

    The rather long MEMORY FAQ has some information on Vintage Mac memory that might help. There are some other threads where others have tried to sort out their problems.

    <BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>Extended Data Out (EDO), JEDEC-standard, 64-bit-wide, 2k refresh, with an access time of 60ns. All 3.3v EDO DIMMs are unbuffered, in accordance with Apple/Motorola developer specifications. Chip-sets vary, but 2k refresh Acme EDO DIMMs invariably work error-free in the Power Macs and Mac clones listed below. All 128MB DIMMs are 4k refresh, and work in all Power Macs listed below, with the exception of the PowerBase, the Power Mac 4400, 6400, 6500, 5400, 5500, 6360 and the TAM. The memory controllers used in all Alchemy, Gazelle, or Tanzania variants cannot handle 128MB DIMMs, requiring a pair of 64MB DIMMs to reach their maximum configurations.

    Please note that 162244-compliant memory (required for NewerTech upgrades) is now available as a separate part number. If you have a NewerTech upgrade, please ensure that you order 162244-compliant DRAM. We do not, at this time, carry a 64MB DIMM which is 162244-compliant. If your Macintosh cannot accept a 128MB DIMM, and you have a NewerTech upgrade, make certain that you talk to us before ordering. Fortunately, NewerTech upgrades are the only upgrades for PCI Power Macintosh which suffer this incompatibility. Sonnet, PowerLogix and XLR8 long ago engineered around this issue, and their upgrades can accept correctly engineered DRAM with buffers besides the 162244.

    It must be stressed that all PCI Power Macintosh support buffered 5v EDO memory with the exception of the Power Macintosh 4400-series, the Power Mac 7200-series, and Power Computing Power Macintosh clones.

    Power Macintosh 8600 & 9600-series
    * Power Macintosh 5500-series, 5400-series (5v EDO strongly recommended)
    * Power Macintosh 6500-series, 6400-series (5v EDO strongly recommended)
    * Twentieth Anniversary Macintosh (note: TAM only recognizes 64MB DIMMs; maximum config two 64MB DIMMs)
    * Power Macintosh 4400 (VRAM ONLY)
    * Power Computing PowerBase 180, 200, 2401
    UMAX S900, S910, C700, C600, and C5002

    Apple Technical Information Library (TIL) article Power Macintosh Computers: Using FPM, EDO, SDRAM & SGRAM notes that only the Power Mac 5500, 6500, and some variants of the Performa 6400 can fully benefit from the improved read cycles afforded by 5v EDO. In order for these Macs to benefit from EDO, however, all memory installed must be EDO. In the event FPM and EDO memory are mixed in these machines, the memory controller will address the DIMMs in Fast Paged Mode (FPM). Interestingly, MacGurus has noted far better compatibility in these Alchemy variants using 5v EDO rather than 5v FPM, and strongly recommends its use.

    All other Apple Power Macintosh, with the exception of the Power Mac 7200, can utilize EDO memory, but reap no performance benefit from doing so. Apple technical documents emphasize that utilizing EDO memory in the Power Mac 7200 may damage the motherboard, and may not be covered under Apple Computer's limited hardware warranty.

    Accordingly, the following Power Macintosh can accept EDO memory in either SIMM or DIMM form factors, depending upon their architecture: Power Mac 6100, 7100, 8100, 5200, 5300, 5400, 6200, 6300, 6400, 7500, 7600, 8500, 8600, 9500, 9600 and 6360. EDO SIMMs are not stocked by MacGurus, but are available as special order items. If you require EDO SIMMs, please contact a MacGurus support engineer. <HR></BLOCKQUOTE>

    I don't know how close MacGurus is to selling memory, and the new web pages for that aren't linked from the front page yet. All the work of bringiing the store and site online, AND having server and email trouble, in the midst of Apple rolling out G5s and a new operating system are making for a VERY busy and hectic period.

    You can find Memory for 8600 at 064MB 168pin Mac 5V DIMM 60NS 2K FPM Non-EDO as well as 128's at very affordable ($20 and $25), and in EDO format as well.

    [This message was edited by TZ on Sat November 01, 2003 PT at 5:22.]

  3. #3
    Join Date
    Aug 2002



    Thanks a million for the helpful info. I have indeed tried to pour through the Memory FAQ. There's been some good stuff in there as well. I'll don't know how likely it is but I'm going to try to return this memory, (although it took a while for it to begin failing) and then start fresh.

    Thanks again!


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