Lemmee see...I have the gist of RAMBUS but have a few questions before going shopping so I don't completely eff it up: 1)Install in pairs where each half of the pair is the same speed and capacity as the other. A second pair (4-slot m'board) must match in speed but need not match in capacity. Optimal config assumed w/out defaulting to lowest speed if different speed pairs are used. Right??

OK, now the nitty gritty part where I am an idiot. Take Ebay for example. I see pics of RIMM's and the product ID/part # is printed and is followed by either a '/8' or '/16'? I think I need the 16...but what does this mean? 2nd question: I see -40 and -45 (ns?) listed on these RIMM's also. My system supports up to 50ns and I ASSUME that the higher number is better, right? But I do not see anything for sale that says -50 on it? Hmmm? Below in my Memory Snapshot, the memory currently installed (one slot) says 400MHZ...so where does PC 800 derive from? Or do the 2 slots function as a pair 400 + 400 = 800 = thus PC800? Only other thing i can figure is that 400 is the channel speed and RDRAM is 2-channel per card or something = 800. Bottom line, I can go 2GB, but I need to know what exactly I'm looking for from a specs standpoint and my machine. Longwinded............sorry and thanks from the idiot. Snapshot below.

Memory Controller
Error Detecting Method 32-bit ECC
Error Correcting Capability Single Bit Error Correcting
Enabled Error Correcting Single Bit Error Correcting
Supported Interleave One Way Interleave
Current Interleave One Way Interleave
Maximum Memory Size per Slot 512 MB
Supported Speed(s) 50 ns
Memory Module Voltage 3.3 Volts
Number of Memory Slots 4
Memory Module Config Handles $08, $09, $0A, $0B

Supported Memory TYPES
Supports Standard Type No
Supports Fast Page Mode No
Supports EDO No
Supports Parity No
Supports ECC Yes
Supports SIMM No
Supports DIMM No
Supports Burst EDO No
Supports SDRAM No

Memory Module
Socket Designation J6F1
Bank Connections RAS 0, RAS 0
Current Speed Unknown
Current Memory Type
Installed Size 128 MB
Enabled Size 128 MB
Correctable Error Exists No
Uncorrectable Error Exists No
ONLY SLOT 1 SHOWN above, SLOT 2 SAME, 3 and 4 unoccupied.

Memory Device
Memory Array Handle $29
Memory Error Info Handle $28
Total Width 16 Bits
Data Width 16 Bits
Memory Size 128 MB
Form Factor RIMM
Device Set 3
Device Locator J6F1
Bank Locator RIMM1
Memory Type Other
Type Detail RAMBUS
Memory Speed 400 MHz

Memory Device Mapped Address
Starting Address $00000000
Ending Address $07FFFC00
Memory Device Handle $2B
Memory Array Mapped Address Handle $2A
Partition Row Position 1
Interleave Position 0
Interleaved Data Depth 0

Memory Device
Memory Array Handle $29
Memory Error Info Handle $28
Total Width 16 Bits
Data Width 16 Bits
Memory Size 128 MB
Form Factor RIMM
Device Set 3
Device Locator J6F2
Bank Locator RIMM2
Memory Type Other
Type Detail RAMBUS
Memory Speed 400 MHz

Memory Device Mapped Address
Starting Address $08000000
Ending Address $0FFFFC00
Memory Device Handle $2D
Memory Array Mapped Address Handle $2A
Partition Row Position 1
Interleave Position 0
Interleaved Data Depth 0


Anything I missed? Take your time...I said a lot and in a confusion way. I'd hate me too


Quote

...
1. My system supports up to 50ns and I assume that the higher number is better, right?
2. ...the memory currently installed (one slot) says 400MHZ...so where does PC 800 derive from?
Or do the 2 slots function as a pair 400 + 400 = 800 = thus PC800? ...

Quote

...

2. Only available in one speed 400MHz. http://www.crucial.com/kb/answer.asp?qid=4032

But then I found this in one of your links
<<<...is a 184-pin and is available with built in ECC support and Non-ECC at speeds of speeds of up to 800MHz.>>>

So the 400MHZ channel speed and PC800 (600/700 too) designation still confuses me.