Workgroup Server 9150


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The Workgroup Server 9150-series has 8MBs of soldered DRAM on its logic board. Using this board's eight SIMM expansion slots, the maximum amount of DRAM addressable by these computers is 264MB.

Note: The 9150's High-Speed Memory Controller (HMC) requires memory SIMMs to be installed in pairs. Like other Power Macs, the 9150-series has a 64-bit internal memory path. Since 72-pin SIMMs are only addressable 32-bits at a time, they must be installed in matched pairs. When purchasing DRAM upgrades for the 9150, please ensure you purchase two at the same time. For best results, SIMMs used should have common chip sets, and come from the same manufacturer.

Specifications:
Logic Board RAM		8MBs Soldered
Supported SIMMs		4MB, 8MB, 16MB, 32MB
Number SIMM Slots		Eight (8)
Number VRAM Slots		None
L2 Cache Supported?		L2 SIMM: 1MB
SIMM Type		72-pin, 32-bit, 80ns or faster

While some of the products mentioned on this page may no longer be available, the information about these products remains available to those who may need it.

According to Workgroup Server 9150: Video Support, (TIL #15219), the 9150-series utilizes 1MB of DRAM for video buffering when the motherboard's DB-15 socket is utilized. No further expansion is available without resort to an Apple PDS video card or third-party NuBus video cards.

It should be noted that the 8150 & 9150-series, in contrast to other Power Macs of this generation, typically shipped with a PDS terminator rather than a 2MB AV or 2MB/4MB Video Card in the PDS slot.

Workgroup Server 8150 and 9150: PDS Needs Terminator (6/95) (TIL #15354) emphasizes that the PDS bus must be terminated, either by the terminator included with the 9150-series (part number 922-0967, PDS Terminator Board), or by an AV or 2MB/4MB Video Card.

Power Macintosh: User Removal of PDS Card Not Allowed (3/94) (TIL #14994) warns that "...operating the computer with the PDS card removed can result in damage to the logic board of the Power Macintosh."

Interestingly, some of the most preposterously arcane articles in Apple's Technical Information Library (TIL) pertain to the WGS9150's memory operations. We refer specifically to the following delightful articles:

• Workgroup Server 9150: Memory Bus Operations (4/94) (TIL #15217)

• Workgroup Server 9150: Memory Overview (4/94) (TIL #15218)

• Workgroup Server 9150: External Cache (4/94) (TIL #15215)

Finally, it is noteworthy of this series that the 80mHz variant featured a 512k L2 cache rather than the 1MB L2 cache included with the 120mHz model.