Determining memory origins

[Rick]

Hi, I've got a PII266 that getting a bit long in the tooth. It's running on a 66 bus, but since I'm going to be replacing the CPU soon I thought I'd bump it up to a 100 FSB. Before that I want to determine if the memory will take it. Is there a web site that will decode the numbering on the memory chips? It's starts HY and ends in -10 so I'm hopeing it's PC100.

thanks

Rick

[Hunsow]

Just try it, some of them work just fine at 100MHz. Just search for the number in a search engine, works for me every time.

[Thundrchez]

I think that would be a Hyundai brand of memory by starting with HY. The "-10" is the speed grade in nanoseconds, which does not nec. mean PC-100.

I'll be very surprised if you could get your P2-266 oc'd from a 66MHz FSB to 100MHz FSB. You can probably overclock it a good bit, but not that much.

Perhaps this page will help you out. http://kcs.hei.co.kr/models/dram/sdram.html

[Rick]

Thanks for the link Thundrchez. Fliped the FSB to 100 and the dang thing won't even POST. Screen stays blank, and the HD light go on for a bit then stops. Oh well, there goes that idea.

Rick

[Cyberdude]

HI,

I've got an PII 266 and I got it up to 366Mhz With 100Mhz Mem-stick and a P3b-f.
Multiple 3.5
Fsb 105Mhz

But it crashes without very special cooling!!!!!!!
Because the p2 uses more power(2.80Volts, O/C 3.00V) so it generates more heat.

Cyberdude

Ps I'm using a PIII now.

------------------
I'm just 15, from Holland, can speak 5 languages and my grades arn't to good!
So bare/bear...........ehuh..

Try to understand me.?!? Ok??


[This message has been edited by Cyberdude (edited 28 January 2000).]

[birdy]

the -10 on the memory chips probably refers to the speed rating of the chips, however the way some companies measure this differs from others. I have a stick of 8ns siemens ratings that runs stable at 133mhz and another couple of sticks of 7.5ns (micron i think)memory that won't even post at that speed. If your memory is of a good make then 100mhz is within your reach if not then dig deep or buy a celeron.

[Wombat]

I don't understand how Micron rates memory -- I have PC133 stuff of theirs, and they also use 7.5ns chips.

[Jorden]

The -10 stands for 10 nanoseconds, as anyone has guessed already. And as far as I know this is the first kind of SDRAM that hit the market, for the 66MHz FSB boards only. Try to put it in a higher spec board, and it won't boot, as Rick already told us.

It IS backward compatible with EDO RAM though, so if you've got a board which has 4 SIMM and one or two DIMM slots (mostly VIA), you can put EDO RAM and the -10 RAM together, or so I've experienced

Jorden.

P.S: PC-100 certified RAM starts at 8 or 9 nanoseconds.

[This message has been edited by Jorden (edited 28 January 2000).]

[Guyver]

If the micron 133 memory is anything like my PC133HSDRAM, then the fact that the chips are 7.5ns doesn't matter as much, as they are gettung an effective access time of 4.6ns. Somehow they split the address resolution and get two or more memory segments simultaneously in order to lower the 7.5ns to an effective 4.6ns access time.

This is all theory mind you, I don't know this for fact. If anyone does know for certain how they get 7.5ns chips to rate a 4.6ns read cycle, and could explain it in 3 or less pages on this thread, I would be very interested in reading it...

Guyver - Intrigued, and guessing...

[Barbarella]

hi,

Hy is use by siemens. You can find here some
dram info.
http://www.infineon.com/products/mem...dules/3125.htm

But for old dram i'm not sure you will find any informations

Be carreful. With my first BX board, i have use Micron 66 Mhz at 100 Mhz. I have burned one of my 32 Mo sdram AND my G200. I think this due to the relation with AGP. Another Think, 66 Mhz Sdram running at 100 mhz will be hot, too hot ? so be carreful

@++

[KvHagedorn]

If I'm not mistaken, isn't the 266 from the era before Intel locked their multiplier? You might be able to back down the multiplier to 3X or 3.5X and get 300 or 350 out of it.. (i wouldn't count on 350 though)

make sure you cool it!

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Kind Regards,

KvH

[Rick]

Tried messing with the multiplier first. Posted as PII100 or something like that, so back it went to 4x