Hp memory Not seen?

[Ray1013]

I have a HP Pavillion 3100, 166, it originally came with 16mb pc66 sdram. two slots. I tried to install 128mb pc133 and pc100. when the system posts it only reads 32mb ram. (with the 128 only installed). when testing the memory (16mb) it shows 10ns. the memory i got from hp shows 7.5ns....is this the problem with the system not seeing all 128mb of ram? The latest bios is on the system 4.06.

[BigBlue66]

It's very likely that the system, regardless of BIOS date, will only recognize 2-clock SDRAM. Everything you get nowadays is 4-clock, which explains why it's only reading one fourth of the memory.

You will either have to live with it, or find some 2-clock SDRAM somewhere. Good luck on that.

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This message has not been edited by BigBlue66.

[Ray1013]

Originally posted by BigBlue66:
It's very likely that the system, regardless of BIOS date, will only recognize 2-clock SDRAM. Everything you get nowadays is 4-clock, which explains why it's only reading one fourth of the memory.

You will either have to live with it, or find some 2-clock SDRAM somewhere. Good luck on that.

I appricitate the information and hate to be a pain, but can you explain the 2 clock 4 clock. does it have to do with 70ns or 10ns?

[YODA74]

ray SDRAM requires clock lines running from the system clock to the memory module. Two clock means there are two clock lines running to the module, and four clock means there are four clock lines running to the module. Four clock designs are faster because they allow less chips per clock line, enabling a quicker interface with data.
Opps I see you mentioned something about 7ns and 10ns,well That means one tenth of a clock cycle per nanosecond, or one clock cycle in 10ns. 100MHz SDRAM chips are marked as 10ns, because there are 10ns between clock cycles.Hope I got this right


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YODA74@windows-sucks.com

CCMR (http://www.dreamwater.net/tech/yoda74/index.html)

[This message has been edited by YODA74 (edited 04-10-2002).]