Recently, Somebody Somewhere wrote these words
> I have a Computer with a SIS648 / SIS693 chipset on an Asus board.
> Actually, it's quite old, but I would still like to use it, because it
> has 1.5GB of RAM and a lot of hardware installed. The processor is a
> pentium IV with 2533MHz. But I have a big problem with memory
> performance, which is so severe, that I cannot use this computer for
> serious tasks, if I cannot fix this:
>
> I have 2243 MB/s memory read performance (which is not good, but still
> acceptable), but 451 MB/s memory write perfomance, which is absolutely
> unacceptable.
>
> I have no idea, what could make writing so much slower than reading.
> Does anyone know, what could be the problem? The BIOS settings are
> according to the EEPROMs on the DIMMs, so should be OK. The bus clock
> is 133.3MHz, and in fixed ralation to the processor clock of 2533MHz
> (*19). I even checked the bus clock with a frequency counter. The
> memory clock is 167.3 MHz. This should also be OK for a DDR333.
>
That chipset was always well spoken of.
Memory cycles these days are something like 6-1-1-1, i.e. The first
cycle should be the long one. Whatever this is, note it and then do the
following:
1. Buy a can of freezer. Freeze memory, Northbridge, &
Southbridge individually & retest after each freeze.
2. Increase timings to the slowest option in the Bios.
3. Slow that cpu right down. If the memory is only doing 133 or
167 Mhz, Your cpu will hardly profit from speeds over 1 Ghz. Time to
speed it up later.
A multiple of 19 is awkward. When the accesses are too fast for the
memory, there is a fallback timing arrangement which slows things
considerably. Evidently you can read but not write at current speeds.
--
With best Regards,
Declan Moriarty.
--
Author: Declan Moriarty
INET: [EMAIL PROTECTED]
Fat City Hosting, San Diego, California -- http://www.fatcity.com
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