high density or low density 128mb module, how do I know ?

[ZL1]

Hi

guys I have a question, how do I indentify a high density 128mb module ?
by the way is high density with chips on both sides ? or is high density with chips on one side only ?


please help


THanks
Dan

[JPMiller]

http://www.dewassoc.com/performance/...o_id_pc133.htm
This is a good spot for memory info in general...still looking for answer to specific question though....dont want to answer till I'm sure.!
----------------------------------------
OK ....blatantly plaguerized from...
here
A high-density SIMM is one which has been designed with 64Mbit DRAM chips and a low-density chip is one which has been designed with 16Mbit DRAM chips. A SIMM designed with 64Mbit chips will have fewer chips than a SIMM designed with 16Mbit DRAM chips.

[DoctorReno]

I forget the exact formula but it is fairly simple. It was something to the effect of the # of megs on the stick times something divided by the number of chips on the stick equaled the density. When I dig it up I will post the formula.

[DanU]

Originally posted by JPMiller
A high-density SIMM is one which has been designed with 64Mbit DRAM chips and a low-density chip is one which has been designed with 16Mbit DRAM chips.

Not exactly true. Density is relative. A memory module made with 64Mbit chips can be considered low density compared to one made with 256Mbit chips.

In regards to 128MB DIMMS, you can find them with four, eight, or sixteen chips (8 on each side). The four chip version uses 256Mbit chips, the eight chip version uses 128Mbit chips, and the sixteen chip version uses 64Mbit chips. You won't find any with 16Mbit chips. That would require a DIMM with 48 chips!

Density is simply the amount of memory per chip. The formula is extremely simple. It's the total amount of memory on the module divided by the number of chips. Then multiply by 8 to go from Mbytes to Mbits.

[JPMiller]

Sorry DanU....
I did a little more research after I posted that and realized I had given a poor answer that wasn't entirely correct...came back to edit my post and saw you had already posted something similar to what I had planned.
Good reply!
I hate giving wrong/inaccurate info! (Gotta stop posting so late at night and start triple checking my info BEFORE I post!)
Sorry ZL1.

[ZL1]

Thanks guys !

[ZL1]

Originally posted by DanU


Not exactly true. Density is relative. A memory module made with 64Mbit chips can be considered low density compared to one made with 256Mbit chips.

In regards to 128MB DIMMS, you can find them with four, eight, or sixteen chips (8 on each side). The four chip version uses 256Mbit chips, the eight chip version uses 128Mbit chips, and the sixteen chip version uses 64Mbit chips. You won't find any with 16Mbit chips. That would require a DIMM with 48 chips!

Density is simply the amount of memory per chip. The formula is extremely simple. It's the total amount of memory on the module divided by the number of chips. Then multiply by 8 to go from Mbytes to Mbits.

so a 512mb module 64x64 would be low ? a little confused

I couldnt count 64 chips just kidding around


but the main idea is the more the chips the lower the density right ?

[cbuddha42]

what they're trying to say is that low is a relative term. however since dims only come with up to 16 chips (8 per side) then a 16 chip dimm is as low as it goes.

[skuz]

Well, 4 chips for 128 MB is definitely high density. Chips on both sides *usually* are low density and therefore compatible with older systems.

[ZL1]

Thanks guys !


Dan