240 IBM eX5 Implementation Guide
Figure 6-15 QPI Link Frequency setting
PCie adapter compatibility
IBM ServerProven tests IBM and non-IBM adapters that have been proven to function
correctly in the System x3850 X5 server. See the following page for specifics:
http://ibm.com/systems/info/x86servers/serverproven/compat/us/xseries/7148.html
Backward compatibility of Gen2 PCie slots to Gen1 adapters
All Gen2 PCIe slots are backward-compatible to Gen1 adapters; however, not all PCIe
adapter vendors adopted the optional specification of Gen1 that allows a Gen2 PCIe slot to
recognize a Gen1 adapter. When you install a Gen1 PCI adapter that is not recognized by the
server, consider forcing the PCI slot in which the adapter is installed to a Gen1 slot in
F1-Setup by selecting System Settings ï‚® Devices and I/O Ports ï‚® PCIe Gen1/Gen2
Speed Selection. Figure 6-16 on page 241 shows the resulting panel and the available
selections. The change takes effect after a cold reboot of the server.
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