Unofficial Austrumi Linux for English users forum golf & dvd

A Latvian and english Linux tiny operating system. used by golf & dvd lovers

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#1 2011-09-23 13:48:42

atang1
Administrator
Registered: 2006-03-30
Posts: 2705

high density memory chips are defective. not your fault ?

In the days of 2000, semiconductors had low yield, especially with high density memory chips. Manufacturers cheat by using good memory on bad chips by using asic to select the good part of the memory to use. So a 256 mB sdram can have 8 chips of 32mBx64. if chips are good, you only need 4mBx64 and 8 chips to have 8 bits x 256 mB. The yield on 32x64 is hardly 25% of good memory. So, when you use those high density sticks, they fail rather quickly. High density chips have a very bad reputation. Some bios will spend a long time to test the memory before booting. others don't and you have boot problems strange as it deems. Missing files, rebooting constantly etc. All caused by defective memory in the high density slicks. Would you get lucky and have some laptops work with the high density slicks. Not likely. Avoid 32x64 sticks at all cost.

There are 4x64 and 8x64 sticks of less memory(less than 100% yield) that works. It was a question of linewidth lithography and wet processing technology.

Any way, we have a different picture of why high density chips are not reliable.

So, when you buy 256 mB sticks, make sure they are not marked 32x64 anywhere.

Footnote:
32mBx64 is per chip, 8 chips to make 8 bits data wide across.

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2011-09-23 13:48:42

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