No performance increase from doubling ram

I upgraded the RAM in my Mac Pro from 4 to 8 GB of 800 MHz DDR2 FB-DIMM RAM and although I see in About This Mac that the RAM is installed, I'm not noticing any perofrmance increase.  The vendor who sold me it- MemoryAmerica- sent a replacement and it's the same.   When doing tasks in the finder like scrolling through images using the preview window, it gets increasingly slower until I'm constantly getting the spinning beach ball and "Waiting for Finder"...shouldn't 8 GBs of RAM on a MacPro be sufficienct for these simple Finder tasks?
One possible issue- I booted off my installer CD and tried to run Apple Hardware Test and it keeps getting hung on that- it starts the process but then freezes....what is my problem?  Thanks.

Also, it is sometimes a good idea to test and run AHT and your system with just the new RAM properly installed.
It may be your hard drives or something else or storage arrangement is the bottleneck.
Ideal for 2008: 8 DIMMs. And in some cases mixed sets of different RAM (size, vendor) don't work properly together - as in a pair of 2 x 4GB and mixed with 4 x 1GB.

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