How come when I added more RAM my vista chalk up go from 5.9 to a 4.6?

My unproved was 1918 MB (1.9) gigs after a added 512mb to make 2430MB (2.4) gigs and my mark on my vista computer went down from 5.9 to 4.6

How come when I added more RAM my vista chalk up go from 5.9 to a 4.6?

Your dual-channel memory requires matched similar pairs of memory to run at peak carrying out. If you add 512MB minus adding a set of two of them, your dual-channel functions automatically shut off and your ceremonial therefore decrease. Dual-channel will be automatically enabled if you installed identical pairs.

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Did you make a payment the correct kind of RAM?
I don`t know the memory doesnt work well near ur motherboard?
Hi. You do not mention what score you are using, but if the memory is the correct type (DDR2 let's say) after you may be able to run it within duel mode. This will speed up the transfer rate between the RAM and the CPU.
The RAM might not be compatible near your computer which would slow it down.
Your Memory Bus slowed due to you putting in a slower memory. For example your electrical device may be running 667MHz memory if you put in 533MHz memory your memory bus other goes to the lower speed 533MHz instead of 667MHz. I have this situation with my DDR Memory I put a 266MHz within where I have 333MHz and it slowed down my machine.