Vista: Memory Operaions Per second went from 5.9 to 4.9 AFTER I added 2 gig Ram, WHY?

Question

I have Vista, I added a stick of 2 G Ram today and redid the Vista test thing that gives you a 'score'. Before it was 5.9, and AFTER the "Memory Operations per second" line went to 4.9, why would this happen?

The ram I had were 2, 1 gig sticks, and I added a 2 gig stick to the 3rd slot. The memory is exactly the same speed, etc, just that the 3rd slot now holds a 2 gig.

Answer 1

Because now it is running slower less calculations per second.
Like with mine if I have 2x1GB I get a score of 5.8
If I put in 3GB 2x1GB+2x512MB I get a score of 5.8
For best performance use '2GB' 2x1GB or 3GB 2x1GB+2x512Mb matched pair.

"Your scroe is low because its no longer in dual channel you need pairs of matched sticks"

Answer 2

Because the memory isn't a perfect match for the memory that's already in there. Even if it was, you wouldn't expect memory operation to be faster because you had more. The reason more memory speeds things up is because Windows doesn't have to use virtual memory as much when it has more of the real thing.

Answer 3

Above answer (#1) just about nails it ... sounds like the extra stick you fitted is slower ram than the stick you had .... even though it still all works the faster stick cycles back to match the speed of the slower stick