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CBark1
Novice
1,621 Views

750 series SSD performance on CPU, or PCH PCI-E

Where can I find more data comparing the performance of an Intel 750 series ssd (1.2TB HHHL) operating on native PCI-E lanes from the CPU vs PCH supplied lanes. I'll be using a 6700K on a Z170 chipset motherboard. I am trying to determine the penalties caused by the DMI bottleneck, and if it warrants the upgrade to an X99 board.

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5 Replies
ASouz7
Honored Contributor II
128 Views

Hello cmatt85,

We are going to check on this and will advise as soon as possible.

AP16
Valued Contributor III
128 Views

The DMI 3.0 link between PCH and CPU is equivalent of PCIE 3.0 4x slot. If you don`t use SATA SSD/multiple HDDs, and home network connection is not a Gigabit (or not utilized with more than 100 Mbit/s actual speeds), you have no USB 3.0 storages - performance hit should be negligible in comparison with CPU-provided lanes.

CBark1
Novice
128 Views

I'm running a video server with multiple 4k streams that is very sensitive to latency spikes, and I'm wondering if the DMI link may introduce performance inconsistencies. I may just have to buy both and test it out.

AP16
Valued Contributor III
128 Views

I find no actual measures of current Intel PCHs latency, but old chipsets some times impose up to 1000 ns delay for PCIE transfers, so yes, you better take a look on X99 platform.

NMICH1
Beginner
128 Views

They test out both here (on a samsung drive, not an intel one) :

http://www.myce.com/review/native-z170-hyper-m-2-vs-pcie3-m-2-77791/ Native Z170 Hyper M.2 vs PCIe3 M.2 - Myce.com

and find no difference.

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