藍白G3抓不到512mb ram嗎？？
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藍白G3抓不到512mb ram嗎？？
今天去光華買了一隻創見512mb ram回家一看點腦只抓到256...是電腦不支援512還是ram有問題？？
藍白G3抓不到512mb ram嗎？？
It's the limitation of the memory controller... max RAM == 1GB ( 4 x 256)
The RAM expansion slots accept SDRAM DIMMs that are 3.3volt, unbuffered, 8-byte, non-parity, and PC-100 compliant. The speed of the SDRAM devices must be rated at 125MHz (8ns) or faster.
IMPORTANT
DIMMs with any of the following features are not supported in the Power Macintosh G3 computer: registers or buffers, PLLs, ECC, parity, or EDO RAM.
The 8-byte, 168-pin DIMM has one 64-bit-wide data bus per bank.
The minimum bank size supported by the Grackle memory controller IC is 2MB, and the largest is 128MB. The largest DIMM supported is a two-bank DIMM of 256MB using 128Mbit SDRAM devices. The maximum number of devices per DIMM is 16.
SDRAM Devices
The memory controller in the Grackle IC supports 1Mbit, 4Mbit, 8Mbit, 16Mbit, 64Mbit, and 128Mbit SDRAM devices that are PC-100 compliant. The speed of the SDRAM devices should be rated at 125MHz (8ns) or faster. The Grackle memory controller IC is configured to detect devices with a CAS latency as low as 1 and as high as 3. The Grackle IC is configured to support the slowest SDRAM bank it detects in the system. The access time from clock at CAS latency of 3 should be 7 ns or faster. Burst length should be at least 4 and the minimum clock delay for back-to-back random column accesses should be a latency of 1 clock.
The RAM expansion slots accept SDRAM DIMMs that are 3.3volt, unbuffered, 8-byte, non-parity, and PC-100 compliant. The speed of the SDRAM devices must be rated at 125MHz (8ns) or faster.
IMPORTANT
DIMMs with any of the following features are not supported in the Power Macintosh G3 computer: registers or buffers, PLLs, ECC, parity, or EDO RAM.
The 8-byte, 168-pin DIMM has one 64-bit-wide data bus per bank.
The minimum bank size supported by the Grackle memory controller IC is 2MB, and the largest is 128MB. The largest DIMM supported is a two-bank DIMM of 256MB using 128Mbit SDRAM devices. The maximum number of devices per DIMM is 16.
SDRAM Devices
The memory controller in the Grackle IC supports 1Mbit, 4Mbit, 8Mbit, 16Mbit, 64Mbit, and 128Mbit SDRAM devices that are PC-100 compliant. The speed of the SDRAM devices should be rated at 125MHz (8ns) or faster. The Grackle memory controller IC is configured to detect devices with a CAS latency as low as 1 and as high as 3. The Grackle IC is configured to support the slowest SDRAM bank it detects in the system. The access time from clock at CAS latency of 3 should be 7 ns or faster. Burst length should be at least 4 and the minimum clock delay for back-to-back random column accesses should be a latency of 1 clock.