Will PCIE_2 work as well as PCIE_1 if they are both x16?

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Dromgatti1982

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May 10, 2011
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My CPU cooler is so large it ever so slightly over-laps over my PCIE_1 Slot. Can I place my Video card into PCIE_2 or will that effect performance? They are both x16 PCIE slots. Damn this is so disappointing, my heart hurts...it was looking so neat. Any and all advice is greatly appreciated; thank you.

Motherboard: Gigabyte GA-X99-Gaming G1 Wifi
CPU: Intel i7-5930K 3.5GHz
CPU Cooler: Cooler Master V8 GTS
Video: Gigabyte GTX 980
RAM: Crucial DDR4 16GB 1600
Storage1: Intel 730 Series 480GB
Storage2: Standard WD 4TB
PSU: Corsair AX1200
Tower: Rosewill Throne
 
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The warning is probably one of those catch-all stickers designed to limit liability on certain products, but used by marketing or ignorant people where it's not needed. Obviously, not all Intel processors supply enough PCI-e lanes to supply PCI-e x16 to 2 physical slots, so in cases where multi-card configurations take place using a CPU supplying inadequate PCI-e lanes, placing a graphics card in the second slot and no graphics card in the first causes the motherboard to route x8 lanes to both slots using switching chips.

I would plug your card in and see what the slot interfaces with it at. If it runs at a full PCI-e 3.0 x16, which you should be able to test with something such as GPU-Z, then your performance...
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Dromgatti1982

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Thank you for trying to help me... I already gave that a shot.
 
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Dromgatti1982

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yeah thats what I saw in the mobo manual...thats why I asked this question. Dang this cooler looks so neat and I blew 100 bucks on the dang thing. Thanks for the feedback man.
 
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Dromgatti1982

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http://www.gigabyte.com.au/products/product-page.aspx?p... "2 x PCI Express x16 slots, running at x16 (PCIE_1, PCIE_2)
* For optimum performance, if only one PCI Express graphics card is to be installed, be sure to install it in the PCIE_1 slot"

Does anyone know why exactly this is the case? I am trying to understand what I am missing out on exactly. Any and all advice is greatly appreciated; Thank you guys!
 
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bigpinkdragon286

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Oct 3, 2012
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The warning is probably one of those catch-all stickers designed to limit liability on certain products, but used by marketing or ignorant people where it's not needed. Obviously, not all Intel processors supply enough PCI-e lanes to supply PCI-e x16 to 2 physical slots, so in cases where multi-card configurations take place using a CPU supplying inadequate PCI-e lanes, placing a graphics card in the second slot and no graphics card in the first causes the motherboard to route x8 lanes to both slots using switching chips.

I would plug your card in and see what the slot interfaces with it at. If it runs at a full PCI-e 3.0 x16, which you should be able to test with something such as GPU-Z, then your performance is as expected. If you get something else, such as x8, you know why they recommended to use the first slot, first. You would have to know how Gigabyte chose to route the physical connections from the CPU to the slots to understand the behavior.
 
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