Another thing you might want to try is removing 1GB of RAM. Yeah... REmoving
so that you're left with an even number of identical DIMMs installed totalling 2GB.
Is he crazy? Is he nuts?
Maybe not. Depending on the configuration (eg, 2 x 1GB and 2 x 512MB, or 1x 2Gb and 2 x 512MB) you may have disabled or degraded your ability to run in dual channel mode. I honestly don't know for a fact what impact that would have on SH4, but I do know that, in theory, it
could be significant.
If that helps, you then might want to consider upgrading to 4GB by adding 2 more DIMMs identical to the first 2.
And yeah, yeah, I know about the 32bit memory address limitation... but for a few bucks "wasted" you get the RAM you need without giving up dual channel.
JD