is it better to work at twice the ram at slower speeds, or original quantity at faster speed?
If I understand the question...it would seem to be "is it better to have 256 of PC3200 or 512 of PC2100"? is that the question?
Id go with the 512 all day long....even in benchmarks there is only a slight difference in the faster mem speeds....some of it is simply "unrealized" market hype.
You could even blow it out of proportion and ask the question this way...is it better to have 256 PC2700 or 512 100m sdram....now that would be an interesting comparison....but Id go with the 512 I think.....like the man said....more ram=less "page file" or "swap file" usage....and even pc100 is wayyyyyyy faster than using a swap file.
As far as mixing brands....I think for 99% of apps it is no problem...for something really super intense, maybe it would matter somehow. Since we all use "synchronized" dram I think that is the main factor now.
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"Even a fool is thought to be wise if he is silent"
Well if your getting another stick of pc133, you shouldn't have a problem with it, mixing ram that is the same size, speed and latency is the ideal situation, but it should still work together, however that kingston and crucial should work just fine together and run nicely on your computer.