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PCIe-6374 possible limit on sample rate?

I am interested in a PCIe-6374 multifucntion I/O device for simultaneous generation and acquisition of signals. I currently own a USB-6356 and am quite familiar with it but would like to upgrade to the PCIe-6374 AI higer sample rate. I am using LabVIEW NXG. 

 

I am aware that the PCIe-6374 features x4 PCI Express (my PC as well) which should theoretically enable 1 GB/s total througput, giving 500 MB/s per direction for simultaneous AI and AO (I assume this is correct?).

 

My question is, can bottlenecks be introduced due to the PCIe architecture, leading the inability to utilise the max. AO sample rate of the device (3.571 MS/s)?

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