truemaster wrote on 2020-04-30, 09:39:

i have a 512mb memory stick dual sided that is compatible with an intel 815 board via apollo pro 133 (only 256 usable)

Which one is it? You can't have i815 and Apollo Pro 133 on the same board simultaneously.

Those are some dark photos. Can you give us the text on the black chips on the modules?

One difference is the CAS Latency. The Infineon module is CL2, the other module is CL3. If your BIOS timings are set for CL2, a CL3 DIMM may not work. How do you have the timings set in BIOS on the 694X board?

thanks for reply. i use now the qdi advance 10f (the apollo pro133a) the latency cas has 2 values for both modules the difference i see is the infineon on jedec #1 is 100mhz 2.0-2-2-5 the no name one jedec #1 125mhz 2.0-3-3-6 their jedec #2 is the same 133 3.0 3-3-6 i can see the numbers on black ics on the no name for now is 48lc32m8a2
my bios ram settings are the default ones

truemaster wrote on 2020-04-30, 12:21:

thanks for reply. i use now the qdi advance 10f (the apollo pro133a) the latency cas has 2 values for both modules the difference i see is the infineon on jedec #1 is 100mhz 2.0-2-2-5 the no name one jedec #1 125mhz 2.0-3-3-6 their jedec #2 is the same 133 3.0 3-3-6 i can see the numbers on black ics on the no name for now is 48lc32m8a2

Sure that's complete? That sounds like a Micron MT48lc32m8a2xx-xx, Those last "xx" numbers are the most relevant here, that's the cycle time.

my bios ram settings are the default ones

Defaults are great if everything works fine, if not it's always worth double-checking as there can be bugs in defaults. In this case they look good - PC133 CL3 is 7.5ns, so 8/10ns with CAS 3 should be OK

So... why isn't it working. Good question. I'm trying to find a QDI memory QVL, but that's not so easy...

Edit: QDI doesn't seem to have published QVL lists :'(

Did find some BIOS files on archive.org - none specifically lists memory compatibility, but if you're not running version 4.6 it could be worth a try:
https://web.archive.org/web/20011202070430/ht … _advance10E.htm

i had just a previous bios revision 4.5 i will update it to 4.6. worst case senario i will try to find the exact same module i have total 128 now, another 128 will be enough. but i will make some test to see if the 512 one is really no go first. but is still weird on a slot 1 qdi advance (apollo pro 133) the 512 works and the settings are the same.

ok i test the no name with updated bios still no dice. but i have the serials of the ics
infineon HYB39S256160CT-7.5
no name 48lc32m8a2-75

Weird... the Infineon DIMM is rated for CL2, but with 7.5ns it should only be able to do CL3... Still, Infineon is solid stuff and can frequently handle more than its official rating.

I'm afraid it looks like a compatibility issue between the motherboard and the DIMM. That's unusual as Via memory controllers tend to be slow, but very compatible. I'd say try and find a different DIMM - this board should support up to 1.5GB of PC133. With Win98Se going over 512MB is problematic though, so a single 512MB DIMM it does like would be optimal.

thanks for the advice. because its via i though that might be configuration issue. but you confirm my first though. i will buy an exact same brand with same timings as my infineon that will be ok for sure

a small update i have free time today so i mess with the bios configuration. at the line 5 in my photo dram clock if i change it from host clk to hclk-33 the 512 no name memory will work. what i dont know is if such selection has negative impact on performance. i(theories) f the only impact is the memory to work on asynchonous 100fsb its no big deal. but if the whole system is underclock then its no go for me

truemaster wrote on 2020-05-01, 15:19:

a small update i have free time today so i mess with the bios configuration. at the line 5 in my photo dram clock if i change it from host clk to hclk-33 the 512 no name memory will work. what i dont know is if such selection has negative impact on performance. i(theories) f the only impact is the memory to work on asynchonous 100fsb its no big deal. but if the whole system is underclock then its no go for me

If it doesn't mess with the FSB speed, you shouldn't see a big impact on performance. The memory will run at PC-100 specs.

What CPU are you using ?

pentium 3 800mhz eb 133fsb. i had instabilities crashes and when right clicking on desktop the comands messed up. so i revert the changes and put the 128mb infineon back. looks like i need to buy a new memory, and forget about this 512 module

truemaster wrote on 2020-05-02, 08:30:

pentium 3 800mhz eb 133fsb. i had instabilities crashes and when right clicking on desktop the comands messed up. so i revert the changes and put the 128mb infineon back. looks like i need to buy a new memory, and forget about this 512 module

Get a pair of 2 x 256MB PC-133, it should be good enough for that machine.

can you recomend some modules for chipset 694X ? last thing i need is a set of uncopatible ones. although via is compatible with almost anything but i have some fear

Don't take my words for granted, I always had luck with Infineon and Samsung memory sticks.

yup since ive got one working infineon. im gona take either 2x256 or 1x512 same brand