16X PCI Express Video card used in a 4X PCI Express Slot?

Posted on 2009-12-17
Last Modified: 2012-06-21
Just wondering if this will work but at 4X speed?

The card info is:  Encore VGA GeFORCE 7300GT nVIDIA PCIe / PCI Express Graphics / Video Card, 256MB RAM, 128-Bit, ENVGA
Question by:Rog
    LVL 8

    Expert Comment

    Yes, normally it will work well. In your case, there's almost no difference in performance between 4x and 16x slot. 7300GT is not a strong card, so a 4x bandwith for it is more than enough. Tested on my mainboard which have 2  pciex16 (one run at 16x and one at 4x) and there's almost no diference with 8600GT
    LVL 26

    Accepted Solution

    If it physically fits in the slot [and doesn't ground out on the end that sticks out] it will work fine but at 4x speed.
    Some 1x, 4x, 8x slots actually are missing the back 'wall' to allow installing longer cards easily.

    The end of PCI-e cards near the back plate [back of case] has all the power and control circuits and is the same on all PCI-e cards.
    The rest of the card is for the data only and it's simply the same circuit repeated once for each 'x' the card is.
    The added 'x's just increase bandwidth [speed].
    Being up/down interchangeable like that is REQUIRED by the PCI-e specification so all PCI-e cards are REQUIRED to work in all PCI-e slots, and all PCI-e slots are REQUIRED to work with all PCI-e cards.
    - The problem is that is about 'the electrical' and it assumes they physically fit in the slot.
    - There is no requirement for motherboards manufacturers to layout boards so any card will 'physically' fit into any slot.
    LVL 2

    Expert Comment

    yes, it works, but it will be running on 4x not 16x, as your slot only works on 4x
    LVL 26

    Expert Comment

    Thanks for the update r2r
    - That's what I said...

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