Answer
From the picture of the motherboard shown you can deduct the following:
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there are four 64-bit, 5 Volt slots
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there are two 64-bit, 3.3 Volt slots
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the 5 Volt slots can only be 33 MHz
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you cannot know if the 3.3 Volt slots are 33 MHz or 66 MHz
In this PC you can thus actually put two S32PCI64 cards or two
FILAR cards. The 5 Volt slots are not usable for these cards.
From the datasheet
from the SuperMicro motherboard
you can find out that the 3.3 Volt slots can be configured to run either
at 33 MHz or at 66 MHz.
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