Dell T440 PCIe NVME

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SimonDP

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Apr 9, 2025
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Hi All, I have several deployed T340 Dells with PCIe cards holding NVME Drives and they run very well. Windows servers are snappy and I love it.


But, I have bought a couple of T440s with 2 x Gold 6126 CPU and 128GB RAM and the same NVME on PCIe riser cards and these seem slow.


Windows servers seem to take ages to do tasks that would be quick on the Single CPU server


What I am wondering is do I somehow have to direct which CPU uses which PCIe ?

I understand that different PCIe slots are connected to different CPUs

How would I direct that or is it just handled automagically?


ever curious...


Thank you for any answers

Simon
 
What is ‘fast’ and ‘slow’ according to your definitions. I would start by defining the problem, benchmarking and seeing where the differences and limitations of each platform are.

Not sure what you have for hardware, but Dell sells those cards both in SATA and NVMe flavors (and for VMware even SD card), they’re only intended for boot drives.
 
specific PCIe slots are connected directly to the CPUs while others are connected directly to the Chipset on most motherboards, it is something inside the design of the board, so the best you can do there is switch PCIe slots to make sure your most demanding card is in the slot connected to the CPU.

i recently had issues with this, running 3 GPUs when only 2 slots connect to the cpu and the positioning made it so i could only actually have 1 in the right slot, the other two were horribly slow and causing a fair number of issues, i ended up having to ditch one GPU and only use two so they were in the right slots.

typically the top and middle slot rated for x16 are the CPU slots on most motherboards but this can vary depending on boards.

i actually use to have a t340, liked it a lot, but i never had the dual cpu version(or the T440), i am not sure which slots on that one are the CPU connected slots, i would guess the full size one is probably it and could even be the only, in which case that would be the one you see full speed on, the chipset slots can be quite slow esp if multiple cards are moving data
 
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