ATI Technologies HD3800 Series, Руководство пользователя

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Chapter 2: Hardware Installation
19
Using a module type power supply to run crossfire mode with two
HD3850X2/HD3870X2 graphic card, it requires 4PCS PCI-E 6-pin power
cable connections.
Please be informed that the 4PCS PCI-E 6-pin power cable connections
must be provided by two separated power source of the power supply.
As the illustration the first HD3850X2/HD3870X2 graphic card has 2PCS
PCI-E 6-pin power cable connections from the native power cable part of
the power supply, then the second HD3850X2/HD3870X2 graphic card
has another 2PCS PCI-E 6-pin power cable connections from the
extension PCI-E power cable module.