Is this "dynamic"? If cards are installed in slots 3 & 4, will they only experience that bandwidth penalty if they are both actively doing something simultaneously?
Put another way, if the card in slot 4 is "idling", does the card in slot 3 effectively have a mode of operation indistinguishable from a normal x4 slot? And vice versa.
Yes, even though I don't know if there is any card can be really truly idle (cost zero bandwidth) when installed in slot 4. I think the penalty is virtually not exist when that card is idle.
That's why I said the card in slot 3 "may" run slower, but not "will" run slower.
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I just unRARed two 45GB archives simultaneously. I did it first on my Apple SSUBX with M.2 adaptor then with my Crucial M500 on SATA 3.
Apple SSUBX: 6:39
Crucial M500: 12:10
My old Mac Pro 5,1 is packaged up to be sold so I was unable to run any tests on SATA 2, but believe me when I tell you it's a very noticeable difference. The more archives you try to unRAR simultaneously, the more you notice the difference. This is real world usage. Anyone telling you it's just placebo, doesn't know what he's talking about.
Thanks for the test. For some reason, I miss this post, sorry for the late reply.
This make me really tempted to upgrade to PCIe SSD, however, I have 1st to figure out how to downgrade my dual GPU to a single card, and if it's worth to do that. Otherwise, no slot avail
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