This is why you never rely solely on benchmarks.
What happened is that the memory ran out of benchmark. It would appear that OSMark doesn't need more than 1GB in which to run, so there's no improvement seen by adding more memory beyond that point. How do you prove that's the case? By switching to an actual application: VideoStudio 10 Plus.
Memory In Real Life
The rendering times for my 43 minutes of video clips tell much the same story. There was little difference between the jump from 512MB and 1GB when I stuck to the non-dual-channel arrangement. Effectively, the video clip was rendered in 35 minutes and two seconds (2,102 seconds) when it had 512MB to work with, and 34 minutes and 50 seconds (2,090 seconds) when I upped it to 1GB.
  In real-life applications, more memory means better performance -- especially when it's dual-channel. |
When I rearranged the memory into dual-channel configuration (memory sockets are color-coded by pairs so you can tell where to put them), that time dropped to 31 minutes and 45 seconds (1,905 seconds). That's more than a four-minute improvement. If you do several renders each day, several times each week, you're talking days of saved time within a year just by putting your memory modules where they really want to be.
How about a larger memory size? Well, when I dropped in the third 512MB memory module, the render time actually slowed by 17 seconds to 32 minutes and 2 seconds (1,922 seconds). Why? That's right, class -- because I had upset dual-channel.
When I added the fourth 512MB module to balance the dual-channel arrangement, the render time dropped to 30 minutes and 31 seconds (1,831 seconds). The further decrease in time was the proof I needed to know for sure that the OSMark synthetic benchmark hadn't used the memory I added above 1GB.
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