2 x 2GB or 4 x 1GB

[kungpo]

That's because you have "Memory Remapping" disabled in the BIOS

I did that - now Vista says only 2GB...although the BIOS did agree there was 4GB. Ho Hum.

[scrandman]

Interesting - I'd like to see some facts/report on why that is .......?

It was definitely for sure when A64 was king - the memory controller on the CPU could only cope with running at reduced speed and often only at 2T command rate, whereas with 2 sticks you could easily run at full pelt with 1T. This was because 4 sticks put more of a "strain" on the mem controller.

While technology has moved on (and the mem controller is on the motherboard with Intel), it's still fair to say that running 4 will be more intensive for the memory controller. In addition, twice the amps is required for 4 sticks over 2, thus putting more load requirement on the motherboard's circuitry dedicated to the memory sticks.