Going to replace edo ram with sdram in this system but I'm confused about what they mean when saying (1)4mx64 and 2mx64 - at the very bottom it implies that I put 2 64mb sticks in bank 2 and 3, but the total ram is still only going to be 64mb?
Here an example, that you can understand.
I'll take as example: Size 16MB , Bank 2: (1) 2Mx64
8 Bit = 1 Byte
(I'll take the decimal values, not the binary values...)
16Mb = 16MegaByte = 16.000.000 Byte = 128.000.000 Bit
2M x 8Byte = 2.000.000 x 8Byte = 2.000.000 x 64Bit = 2Mx64 = 128.000.000 Bit
#1 K6-2/500, #2 Athlon1200, #3 Celeron1000A, #4 A64-3700, #5 P4HT-3200, #6 P4-2800, #7 Am486DX2-66
wrote:Going to replace edo ram with sdram in this system but I'm confused about what they mean when saying (1)4mx64 and 2mx64 - at the very bottom it implies that I put 2 64mb sticks in bank 2 and 3, but the total ram is still only going to be 64mb?
64 means 64bit-wide SDRAM modules, and (1) means 1-rank SDRAM modules. 1 x 4M x 64 (bit) = 256Mbit = 32MByte.
wrote:Here an example, that you can understand. […]
Here an example, that you can understand.
I'll take as example: Size 16MB , Bank 2: (1) 2Mx64
8 Bit = 1 Byte
(I'll take the decimal values, not the binary values...)16Mb = 16MegaByte = 16.000.000 Byte = 128.000.000 Bit
2M x 8Byte = 2.000.000 x 8Byte = 2.000.000 x 64Bit = 2Mx64 = 128.000.000 Bit
That makes sense. Any idea what capacity ram this is? It has the most chips of any edo/fast page I own, the numbers on the chips are fairly random and not indicative of a certain size (they're odd numbered for a start)
wrote:Any idea what capacity ram this is?
Define "this"... (or post a picture)
wrote:wrote:Any idea what capacity ram this is?
Define "this"... (or post a picture)
That's not very helpful since the markings on the chips are unreadable. In any case if it has chips on the other side it's probably 8MB, if not probably 4MB. Best/fastest way to tell for sure is to stick it inside a computer and see how much it reports 😉
wrote:wrote:wrote:Any idea what capacity ram this is?
Define "this"... (or post a picture)
That's EDO or FPM, it isn't SDRAM as those never came in SIMMs (this is a 72p SIMM).
Btw, the module is either 4MB or 8MB (8MB if it also has 8 chips on the other side of the module).
wrote:Best/fastest way to tell for sure is to stick it inside a computer and see how much it reports 😉
Agreed 😀
I liked using a PA-2005 or PA-2002 for this purpose, as it's a Pentium board that can read single SIMMs (it doesn't need pairs) and most 486 boards are either too rare to use as test bait or don't support EDO.
