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idata
Community Manager
939 Views

DZ77GA70K: graphic card only running at x8 speed

I have a DZ77GA-70K here (latest Bios 0061) with an Intel 3770K (not overclocked), 16GB (2x8) memory and a Nvidia GeForce GTX 650 Ti running Windows 7 Pro 64Bit SP1 with all updates applied, all drivers are up to date. Apart from the graphic card in the first x16 slot (Bios: Slot 6) I have a x1 card in the second x16 slot (Bios: Slot 3). It seems that putting a card in the second x16 slot immediately reduces the speed of the first one?! So my questions are:

1. Is this behavoiur know and/or normal? Couldn't find anything in the manual.

2. If it's not normal is there something I can do apart from removing the second card?

Thanks in advance for all your answers!

(Since this is not my first problem with add in cards on the board you may want to check that thread, too: /thread/34185 http://communities.intel.com/thread/34185 )

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4 Replies
DGood6
Novice
63 Views

Although PCI-E x16 3.0 slots are physically x16, slot 3 is electrically only 8x. The system Z77 chipset is lane sharing between the slots when more than one slot is populated. This is documented in the manual about the second PCI-E x16 slot only being 8x electrical.http://www.intel.com/content/www/us/en/chipsets/performance-chipsets/z77-express-chipset.html http://www.intel.com/content/www/us/en/chipsets/performance-chipsets/z77-express-chipset.html

The Intel 2011 socket motherboard would give you PCI-E x16 full lane support with two PCI-E x16 version 3 slots.http://www.intel.com/content/www/us/en/chipsets/performance-chipsets/x79-express-chipset.html Intel® X79 Express Chipset

idata
Community Manager
63 Views

Hi Dave, thanks for the quick reply! So it's 'by design'. So my next question is if the reduced transfer speed will cause any problems?

And furthermore: I still have the problem with the lowest slot ( /message/179123# 179123 http://communities.intel.com/message/179123 ) but it seems that I must use it anyway to avoid the graphic card running at x8.

DGood6
Novice
63 Views

 

Hi Chris,

A reduction in performance will not be noticeable unless you are using very high end video cards at high resolutions.

I haven't reviewed your other post.

idata
Community Manager
63 Views

SInce it's a GTX650 Ti i should be ok, right? Please have a look at my other post. Your help is appreciated :-)

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