Single / duel banked sdram ?
Win 98 , unknown Quantex series, using biostar m6tba motherboard
My obsolete computer originally came with 64mb of memory, 4 chips on a single side of the stick, pc100.
I soon upgraded to 128 mb, pc133 and since the manual stated a 128 and 64 could not be used together I put the 64 mb aside and forgot about it . The new stick had 8 chips on each side (so was double banked?) and worked perfectly .
Now , years later the system still worked and I wanted to upgrade to the maximum 384mb so bought 2 new sticks of 128mb , pc133 ( the last the shop had!). These sticks are different from the old 128 mb , they are single sided and have only 4 chips ..
Now the problem is these sticks only give 64mb each in any possible combination , whether alone or in combination with the others. I found my old 64mb chip and it still works , with the 2 new chips it gives 64+64+64!
Aida32 recognizes the new chips as 128 mb,
[ SPD ]
[ 128 MB PC133 SDRAM ]
Memory Module Properties:
Module Size 128 MB (1 rows, 4 banks)
Module Type Unbuffered
Memory Type SDRAM
Memory Speed PC133 (133 MHz)
But shows memory to be only 64 mb
[ Memory ]
Physical Memory:
Total 64 MB
Bios only shows 64 also , so a single chip shows as 64, 2 as 128 and old + 2 new = 256
I don't have onboard video so thats not eating the ram.
So , it seems only double sided 128 mb chips function correctly, although single sided 64mb function ok .. The motherboard manual shows pics of single / double sided sdram but makes no other comment .
Now , how do I buy more double sided 128mb sticks? The online sites never mention whether a stick is single or double sided , just obscure configurations such as 16x64 (128)? Is this a double sided 128 mb chip ?
What do I need to look for to get a double sided , 128mb pc133 chip ??
