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Error warning on boot up, and more!

By monster1999 ·
I've just got hold of a second hand PC, (Win 98se, 20mb Hard Drive, Pentium 3, 500mhz processor, 256mram)which has been working like a dream since I got it. Suddenly, however, I'm getting a warning on boot up : 'Warning, SPD not found at DIMM(s)3'. I've ignored it up until now, cos the PC seemed to be working fine. Tonight though. I installed AOL 8, and suddenly most of my previously installed programs won't even open! They don't even appear on 'Add/Remove programs' in Control Panel! I've also got an unidentified device appearing, though I have absolutely NO idea what it is!
Any help would be greatly appreciated.

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Error warning on boot up, and more!

by dmiles7 In reply to Error warning on boot up, ...

Some, but not all, DIMMs come equipped with an SPD EEPROM. What this stands for is Serial Presence Detect Electrically Erasable Programmable Read Only Memory. What a mouthful! That's why computer jargon is all in acronyms. Anyways, a ROM is memory that is non-volatile. This means that when the power turns off, it does not erase its data. Electrically Erasable Programmable means that the ROM can be erased and reprogrammed electrically. I guess that was redundant. Finally, the SPD is basically the little chip that communicates to the memory controller logic and identifies the RAM chips to it. So the SPD identifies the RAM to the system, essentially.

Now that you know what the SPD does, what's the downside of running 10 ns RAM at PC100 spec? Well first, they might be unstable, because they are not true 8 ns chips. Second, because they are already spec'd higher than they should be, this really eliminates the possibility to overclock your system using these modules. It's like the stories how some computer resellers build systems for people, like a 400 MHz system, and the end-user eventually opens the box up to find that it's really an overclocked 266 or something like that.


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Error warning on boot up, and more!

by monster1999 In reply to Error warning on boot up, ...

Technically helpful, but doesn't resolve the problem!

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Error warning on boot up, and more!

by fred07 In reply to Error warning on boot up, ...

DIMM 3 is possibly bad and should be removed. If no DIMM 3 is present then reseat your RAM. Possibly a RAM chip is going bad. Get same type [pc100 or pc133] as in use now. Check the chips in use and match as some MB's will not accept over 64mgs per slot or will only report 64 mgs no mater what size [512mgs] you install. Running a p3 you MB would probably handle a 256 per slot with ease.
Hopefully, with case cover off you will be able to read the MB mfg and go to their web site and check their specs for RAM.
Hope this helps.

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Error warning on boot up, and more!

by monster1999 In reply to Error warning on boot up, ...

Gave a little more help than the prevoius answer!

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Error warning on boot up, and more!

by donmars In reply to Error warning on boot up, ...

When a computer is booted, serial presence detect (SPD) is information stored in an electrically erasable programmable read-only memory chip on a synchronous dynamic random access memory (SDRAM) memory module that tells the BIOS the module's size, data width, speed, and voltage. The BIOS uses this info to configure the memory properly for reliability and performance. If a memory module does not have SPD, the BIOS assumes the memory module's information. With some memory, this does not cause problems. But SDRAM memory has to have SPD or the computer may not boot at all. If it does boot, the assumed information may cause fatal exception errors. Try reseating memory modules. You may have defective memory. If you are using one 256 memory sticknext time use 2 separate memory modules of 128 each.

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