For anyone curious here is both variants of PS2 backwards compatible motherboards. Top is full BC, bottom is hybrid BC : r/PS3
PlayStation 3 Motherboard Replacement - iFixit Repair Guide
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Motherboard Revisions - PS3 Developer wiki
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PlayStation 3 Motherboard Replacement - iFixit Repair Guide
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PlayStation 3 Motherboard Replacement - iFixit Repair Guide
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