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Is there a way I can determine the current Max Read Request size of PCI-Express on a running Windows 7/8 system?

I have googled for some time now and have tried a number of programs that display system information like CPU-Z, HWiNFO64, etc., but to no luck so far. Any ideas?

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Isn't this configured in the BIOS? You can choose manual instead of automatic. I think currently the max is 4GB –  Dave Apr 23 '13 at 10:44
    
Thanks for comment, @DaveRook. I don't have this option in BIOS - just the Max Payload Size, so that is why I'm asking whether I can somehow view this from a runnings OS. B/w the maximum is 4KiB ;) –  Pavel A Apr 24 '13 at 9:13

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