This is the so called GPU air shroud for the R740 and R740xd servers. It is designed specifically for certain GPUs like the Tesla M10. The shroud is installed first and then the GPU. It is reported to maximize airflow especially for larger graphics cards. It should be noted that this shroud is incompatible with the 2U high performance heatsinks. 1U heatsinks are required to use the shroud which in my opinion might not be a worthy tradeoff depending on your CPU, and also considering that large graphics cards work just fine with the 2U heatsinks and normal air shroud, albeit with perhaps a minor hit to air flow efficiency.
Manufacturer: DELL
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R740 and R740xd Riser 1 0GHGTP
This is the third and final variation of Riser 1 for the R740 and R740xd servers. This card is longer than the first variation and also has 3 slots. However, instead of three x8 PCIe slots this riser has a single x16 and two x8 slots.
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R740 and R740xd Riser 3 0DTTHJ
This is Riser 3 for the Dell PowerEdge R740 and R740xd server platforms. This particular riser has a x8 as well as a x16 slot. Unlike the others the x16 slot is the slot at the bottom rather than the top of the riser.
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R740 and R740xd Riser 2 0J7W3K
This is riser 2 compatible with the Dell PowerEdge R740 and R740xd server platforms. It occupies the middle rear section of the server and sits right above the NDC. It features a single x16 slot at the top and 2 x8 slots directly beneath.
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R740 16 Bay PCIe Storage Cable 0129TR
Storage cable for the Dell PowerEdge R740 16 Bay server. This cable connects the backplane to a PCIe RAID or HBA controller.