posted in lowyat.net

Group: Junior MemberPosts: 146Joined: August 2005

Er... 1-sided RAM means that you can only find a number of chips (usually 4 or 8) on a side of the DIMM module but none on the other side. 2-sided RAM means that there are chips on both sides.
For DIMM module, 1-sided RAM means that it'll occupy 1 memory bank on your motherboard's RAM slot, while 2-sided RAM occupy 2 memory banks. However, 1 DIMM module (no matter 1 or 2-sided RAM) uses up 1 RAM slot on your mobo.
The differences between "1-sided / 2-sided" rams are as follow:1) 1-sided RAM usually has denser capacity compare to 2-sided RAM (eg. 512MB RAM = 64Mx8 on 1-sided RAM = 32Mx16 on 2-sided RAM)2) 1-sided RAM usually has higher latency compare to 2-sided RAM, due to larger capacity. (Those premium RAM usually comes in 2-sided RAM)3) 1-sided RAM is harder to manufacture, due to larger capacity4) 1-sided RAM use up less memory banks on your mobo. Some mobos cannot support 8 memory banks, which means that you can't use 4 2-sided RAM at once.
I guess that's about 1-sided/2-sided RAMs

my comments:
1. normally 1 sided is : for 512MB RAM = 64mx8 with 8 chips, 2 sided will be 32mx8 with 16chips. For notebook memory or graphic card, 32mx16 is used to increase the performance which means 16bits are used rather than 8bits per single clock pulse.2. not neccessary 1 sided ram has high latency.it depends on the fabrication process, technology, prices + testing cost. All need to factor in before u produce or manufacture 3. not neccesary and not true. But the testing and probing time will be double but doesnot mean it is harder. Yes it is harder for wafer foundry but not the memory manufacturer like kingston or corsair..or anyone.
in fact, looking back at 1 or 2 sided,if you have 8 chips versus 16chips ..with 1 byte of data out...8 chips will be having more stressful than 16chips. Therefore, when comes to the memory 's heat problems, 8chips has more heating up problems.Therefore, 16chips is better. But due to the cost factor, 8chips is much easier to assemble coz requires less passive components. Hence factory can earn more.
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