Python benchmarks comparing 32-bit to 64-bit performance

[python at bdurham.com]

Are there any benchmarks (pystones or other) that compare a
32-bit and 64-bit versions of Python?
Ideally I'm looking for a benchmark comparing recent Python
releases (2.6.x, 3.x) on an Intel platform.
I'm specifically interested in areas of the Python language where
a 64-bit implementation is surprisingly faster or slower than its
32-bit equivalent.
Thank you,
Malcolm
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