Some generic PC-133 modules are advertised as working also as PC-100.  Many
name modules like Kingston will only work with PC-133.  It may be that your
mobo does not support PC-133, so your 128 Mb PC-133 is being treated as if
it were PC-100. The Kingston module is probably only PC-133.  Do you have
some particular need for 512 Mb of RAM?  For all but the most graphics
intensive or game intensive apps, 256 is usually more than sufficient.  I'll
bet if you traded the Kingston module in for one that is PC-100/133, it will
work.



Hi everyone,
Before today I had 3 modules 64mb-PC100,64mb-PC100,128mb-PC133
and they worked and work well even if I use overclocking = 142 MHz.

Today I bought Kingston module 256mb-PC133 and it works
alone well too but only alone. Any combination with mentioned
above modules doesn't work. Computer counts that there is a
512mb but works unstable.Special memory test (under DOS
without himem.sys) can't even start filling zero pattern.

My motherboard SOYO-6BA+IV manual says nothing that it is
not possible to use 256 mb PC registered module with
other different modules.
I tried to apply different orders, use different slots
but result was the same.

Any ideas will be very appreciated. Maybe some BIOS memory
adjustments could help? I have now these ones:

Autoconfig - Enable
SDRAM RAS-to-CAS Delay 3
SDRAM RAS Precharge Time 3
SDRAM CAS Latency Time 3
SDRAM Precharge Control - Disable
DRAM Data Integrity Mode - NON-ECC

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