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Lenovo ThinkSystem SR645 - Technical Rules for GPU Adapters; Technical Rules for System Fans; Environmental Restrictions

Lenovo ThinkSystem SR645
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Technical rules for GPU adapters
Understanding the technical rules helps you choose the correct GPUs and install them in the supported slots
based on what is configured for your server.
The following are installation rules for installing GPUs for your server:
Performance fan must be selected.
PCIe SSD adapter is not supported.
PCIe slot priority when one processor is installed:
Tesla T4, P620: Slot 1, slot 2
P2200: Slot 2
PCIe slot priority when two processors are installed:
Tesla T4, P620: Slot 1, slot 3, slot 2
P2200: Slot 2
Maximum quantity supported:
When processor TDP is... Maximun. quantity supported
200W 3
≥225W
2
Note: Slot priority: slot 1, slot 3
Technical rules for system fans
Depending on models, the server supports:
Standard fan (21000 RPM)
Performance fan (24000 RPM)
The following lists the required fans when different processors are installed.
Server model
Processor TDP
120W 155W 180W-240W 280 W
4 x 2.5'', 4 x 3.5'',
8 x 2.5'' models
Standard Standard Performance NA
10 x 2.5'' models Standard Performance Performance NA
backplane-less
NA
NA NA Performance
Notes:
Standard fans are enough for low-wattage processors while you can still use performance fans for better
cooling.
If there is an OCP 3.0 Ethernet adapter installed, when the system is powered off but still plugged in to AC
power, fans 5 and fan 6 will continue to spin at a much lower speed. This is the system design to provide
proper cooling for the OCP 3.0 Ethernet adapter.
Environmental restrictions
Use this topic to understand the environmental restrictions for different server models.
Chapter 4. Hardware replacement procedures 105

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