Recently I bought another pair of Ballistix 2x1GB PC4000 from Newegg.
I found out that their behaviour is very different from classic Ballistix Z503...
Voltage scalates very well and I could do 285MHz 3-4-4-10-1T at 2.95V it does run Memtest86+ for long hours no errors but fails in a second running SuperPI so I had do reduce speed.
For my Opteron sweet point I got 270MHz rock stable at 3-3-3-8-1T at 2.85V.
Not as good as the old ones but perhaps may get a longer life...
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