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Revodrive 3 X2 on a Z77 board

post #1 of 4
Thread Starter 
I am wondering if there would be any drawback/performance hit to use a Revodrive 3 X2 on the PCIe 2.0 slot, which is physical x16 (on most boards) but actual x8 to the chipset, as compared to the other slots that are linked directly to the CPU.

448

Theoretically, there should be no issue since the slot has enough lanes (RVD3 X2 requires 4 PCIe 2.0 to achieve its best performance)

In practice, could it be different because data has to go through the chipset first, before reaching the CPU, on top of going through the DMI link that is shared with all other components linked to the chipset ?
DMI 2.0 is 20 Gb/s IIRC. As mentioned above, one 2.0 lane is 5 Gb/s, times 4 for the Revodrive and we've already hit the limit (USB/SATA/LAN ports etc will add up to even more I believe)

Am I missing something ?
post #2 of 4
No the Pci-E slot wont bottle neck the revo drive.
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post #3 of 4
Thread Starter 
I know the PCIe slot itself won't. I'm more concerned about the additional layer (the chipset) on top of the DMI link, depending on the number of USB ports used etc

I guess I'll have to run some tests myself once I get my Z77 board.
post #4 of 4
A x4 pci-e 2.0 card could (theoretically) hit 2GB/s transfer per direction. DMI 2.0 (x4 link which is what I believe the Z77 has) supports 2.5GB/s.

I seriously doubt that you would notice any bottleneck. Read on the Revo is (up to) 1.5GB/s, leaving you with 1GB/s for your LAN, USB and SATA ports. If you were reading from the Revo at max speed and maxing the LAN port, the USB3 port, and a few of the SATA 3 ports, you might see a difference in benchmarks. Other than an extreme case, I would not worry about it.
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