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Which one of the dual CPU should you connect your PCIe device?

PKLee

I'm planning a dual Xeon E5 2670 rig and I'm gonna throw a GTX 1060 as well as a USB 3.1 card into it.

 

On a dual CPU motherboard, there is normally a CPU1 which connects to its own 4 channel memory bank, all storage and IO and stuff, and a CPU2 which only connects to its own 4 channel memories.

 

So my question is, should I install a PCIe device on

    - CPU1's PCIe slot, to reduce latency to other IO and storage and stuff;

    - or CPU2's PCIe slot, to avoid too heavy load on CPU1;

    - or it simply doesn't matter, just use my favorite one.

 

Thank you for your advice.

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Just now, Firewrath9 said:

Top PCIe is usally best.

Even on a server board?

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8 minutes ago, PKLee said:

Even on a server board?

yeah, as they tend to be used first, so if it would be better with cpu2, then they'd put cpu2 on top (I doubt its cpu2 tho)

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2 minutes ago, Firewrath9 said:

yeah, as they tend to be used first, so if it would be better with cpu2, then they'd put cpu2 on top (I doubt its cpu2 tho)

It is from CPU2 though... the top half of them are all from CPU2, at least that's the case on the boards I'm looking at

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If you plan to use this for gaming or productivity using a slot assigned to CPU1 would be best to avoid latency issues. Whichever slots those may be (top, bottom, middle) use them. The slots assigned to CPU2 can be used for less core related expansion like HBA's or NIC's.

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5 minutes ago, PKLee said:

It is from CPU2 though... the top half of them are all from CPU2, at least that's the case on the boards I'm looking at

then use the top one from cpu2

 

or better yet, put it in cpu1, benchmark, then try cpu 2.

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