Year 2008 edition Mac Pros are notorious for their memory probems. I was down to the last 4 gigs from the initial 16 gigs the Mac originally came with. The memory chips seemed to die one by one when they began nearing the end of their warranty which was 5 years. Kingston would have replaced them under warranty, but they didn't have this kind of memory in stock anymore. Luckily I found replacements form Thomann!
I have run the MacPro now daily for a month or so. No problems whatsoever. I have the two surviving Kingston memory cards working perfectly with these Thomann Dimms.
Edit: Well (probably as per planned obsolecense) all of the memory chips eventually died. No fault of these chips probably, but rather the way the Mac was built.
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