None.
Because the RAM's performance isn't a factor in gaming performance in these cases.
The "desktop" applications that benefit from higher RAM performance are very limited.
The desktop programs that benefit mostly from higher RAM performance are the archivers ( WinRAR, 7-zip, WinZIP ) only in Compression/Archiving.
In decompression there's no benefit from using a high performance RAM instead of a "slow" value one.
That applies to every desktop CPU, including the Core 2 Duo/Quad/Extreme, Core i7/i7 Extreme & the Phenoms ( gen. I & II ).
It's the way the applications/algorithms work, not a CPU related thing.
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