Sun (SPARC/) Ultra/Blade/V120 RAM - ein Füllhorn der freudigen Überraschungen :)

Zitat von Sun Systems Handbook V4.1 - EO(S)L'ed V120/B150

V120 Memory

X-Opt ; Part# ; Desc

X7091A [S] ; 370-4237 [C] ; 256 MB SDRAM DIMM
X7092A [S] ; 370-4281 [C] ; 512MB SDRAM DIMM
X7093A [S] ; 370-4874 [C] ;1 GB SDRAM DIMM

Blade 150 Memory

X-Opt ; Part# ; Desc

X6179A [S] ; 370-5676 [C] ; 128MB SDRAM DIMM
X6180A [S] ; 370-5677 [C] ; 256MB SDRAM DIMM
X6181A [S] ; 370-5678 [C] ; 512MB SDRAM DIMM
X6991A [S] ; 370-4149 [C] ;128MB SDRAM DIMM
X6992A [S] ; 370-4150 [C] ; 256MB SDRAM DIMM
X6993A [S] ; 370-4151 [C] ; 512MB SDRAM DIMM

NOTE: The Sun Blade 100 memory parts in options X6991A, X6992A, and X6993A were shipped in some Sun Blade 150 systems, although not all vendors' DIMMs represented by these numbers will work in the 150. Orders for these parts are being monitored to ensure that only qualified replacement DIMMs are shipped for installation in the Sun Blade 150. Use the new part numbers shown above for replacement orders.

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Es gibt keine Angaben dazu, dass die V120er (registered?) DIMMs in einer B150 (unbuffered) verwendet werden. Ob das kann, sieht man zumindest an deinem Ergebnis.

Auf den Bildern zu den Part# 370-4281 der V120 DIMMs sehen die für mich wie "buffered" (registeted) aus. Das wird nix.

Zwei DIMM Hersteller ggf nicht mischen, hingegen sie Kapazitäten (128/256/512MB) beliebig mischbar allerdings dann keine Lücken bei den Slots lassen.

Es gab erfolgreiche Versuche die B150 zu überreden mit 4GB RAM, offiziell nur 2GB, zu arbeiten. Den Link habe ich nicht zur Hand.

Zitat von B150 SvcMan

Memory Architecture

The Sun Blade 150 system uses a 168-pin, JEDEC standard, dual-in-line, 3.3V, unbuffered, synchronous DRAM module. The memory control unit (MCU) is embedded within the CPU. All address signals, control signals, and clocks are driven off of the processor and directly drive the memory subsystem on the motherboard. The CPU L2 cache megacell reserves a 4 Gbyte region for cacheable main memory. The memory controller only supports 4 Gbytes of space. Note –Although the cache and memory controller support up to 4 Gbytes, only 512 MB DIMMS are supported on the Sun Blade 150 system. This limits the maximum DIMM configuration to 2 Gbytes. The system has four DIMM slots on the motherboard. Because the memory data bus width is equal to the DIMMs (64-bit data, plus 8-bit ECC) they can be installed one at a time and with mixed sizes (...)

Ja, das ist alles nicht so enfach und geht schnell unter. Daher sollte der Versuch unternommen werden, den Unterschied richtig zu stellen:

Zitat von escimo

Auf den Bildern zu den Part# 370-4281 der V120 DIMMs sehen die für mich wie "buffered" (registeted) aus. Das wird nix.

registered != buffered

Ähnlich aber nicht gleich.

Habe die Frage eben ChatGPT beantworten lassen. Ob das stimmt ... tja

Zitat von ChatGPT Version 24. Mai 2023

Q: What's the difference between buffered and registered memory?

A(ChatGPT):

Buffered and registered memory are both types of memory modules used in computer systems, but they have some differences in terms of functionality and performance. Here's an overview of their characteristics:

Buffered Memory (also known as Fully Buffered DIMM or FB-DIMM):

1. Functionality: Buffered memory modules have an additional memory controller chip (buffer) between the memory chips and the memory controller on the motherboard. The buffer helps in reducing the electrical load and improving signal integrity.

2. Signal transmission: The buffer receives, amplifies, and retransmits the memory signals, allowing for better transmission of data between the memory modules and the memory controller.

3. Capacity and speed: Buffered memory modules can support higher memory capacities and operate at higher speeds compared to registered memory.

4. Latency: Buffered memory tends to have higher latency (slightly longer access times) due to the additional processing required by the buffer chip.

5. Compatibility: Buffered memory modules are generally not backward compatible with non-buffered memory slots. They require specific memory slots designed to support buffered memory.

Registered Memory (also known as Registered DIMM or RDIMM):

1. Functionality: Registered memory modules have an additional register or buffer between the memory chips and the memory controller on the motherboard. The register helps in reducing electrical loading and enhancing signal integrity.

2. Signal transmission: The register isolates and controls the memory signals, improving the stability and integrity of the data transmission.

3. Capacity and speed: Registered memory modules can also support higher memory capacities and operate at higher speeds compared to regular unbuffered memory.

4. Latency: Similar to buffered memory, registered memory may have slightly higher latency due to the additional processing involved.

5. Compatibility: Registered memory modules are generally backward compatible with regular unbuffered memory slots. However, they may operate in a less optimized mode when used in such slots.

Overall, both buffered and registered memory are designed to improve signal integrity and support higher memory capacities. Buffered memory tends to offer higher performance and capacity, but it requires specific memory slots. Registered memory, on the other hand, offers similar benefits while being more compatible with regular memory slots. The choice between the two depends on the specific requirements of the system and the compatibility of the motherboard.

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Also kurz: Registered RAM ist ECC fähiges RAM mit besonderen elektrischen Eigenschaften, die den Datentransport bis zur CPU "stabiler" machen. Buffered RAM ist ECC fähiges RAM, was zusätzlich noch ganze Bereiche kurzzeitig zwischenspeichern kann, bevor es sie in die eigentlichen RAM Stellen einsortiert - quasi wie ein kleiner Extra Cache direkt auf dem RAM Modul. Beides paßt üblicherweise nicht in normale PCs und muß i.a. auch immer in den Geräten, die es überhaupt benutzen, in Grüppchen von 2 oder 4 Riegeln eingebaut werden. ... Merke: Darum sind Einzelriegel immer besonders günstig zu haben. (Meist sind sie dann aber schonmal in einem PC probegelaufen und wenn sie das überlebt haben, sind sie meist auch gut.)