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stephenlecomptejrFlag for United States of America

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How may I improve my memory operations per second on my Windows Vista machine when I have 8 GB of RAM?

How may I improve my memory operations per second on my Windows Vista machine when I have 8 GB of RAM?  I have currently Windows Vista Home Premium and even with the 8 GB (2GB in each of the 4 slots - all 800 mhz speed) of RAM I get a 5.0 subscore for my Memory (RAM) component - what in the world?   Is there a memory diagnostic tool that I can download and use that may show one of my RAM modules defective?

Earlier, when I first got this computer I had installed an OEM copy of Windows Vista Ultimate and I had a 5.9 for the memory operations per second but my Graphics was 2.9 desktop performance and 3.7 for Gaming graphics.  

I did research on this site that stated that in the BIOS you have to move or add more memory to the graphics card (nvidia 9800 GTX+).  When I called the tech he said there is nothing in the BIOS to do this and that's its the operating system's fault or perhaps not the latest graphics driver.  (This is a Velocity Micro E2250 machine btw)

The tech recommended instaling the latest nVidia driver and if that didn't work reinstall with the original install disc (which is Windows Vista Home Premium).  Now that I've completely uninstalled Windows Vista Ultimate and reinstalled Windows Home Premium I get a 5.0 memory operations per second but everything else is rated 5.9.  

Thus my hunch with this problem is perhaps one of the 4 GB RAM slots are bad or the memory cards are bad...

What do you think?  And how may I verify if its the slot or the actual RAM card?
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I also forgot to mention that its a 64-bit system thus it sees the whole 8GB - unlike a 32-bit system would only see 3GB or 4.
I noticed that two RAM cards have C4 and another C5 - with C5 being slower.  I should have just got DDR3s.