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GTx 770 with PCIe 2.0 x 1?

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  • Gtx
  • Graphics Cards
  • Motherboards
  • Graphics
Last response: in Graphics & Displays
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December 2, 2013 11:47:27 AM

first time beuilding pc and didnt know that the motherboard cld essential bottlekneck/ slow down a graphics card. the motherboard i was getting was ASUS® H81M-E: Micro-ATX, LG1150, USB 3.0, SATA 6GBs which states on its specifications that it has 1 x PCIe x16 and 2 x PCIe 2.0 x1 ... now, the 2.0 x 1 must be a joke as that means it only has 1 lane right? yet the 1.0 is even worse for a modern high endcard? am i missing something or do i seriously need to get a new motherboard, because i want to get the mst out of my card and from what ive read, i need a x16 (16 lanes)but on a 2.0 or 3.0, not a 1.0? the full specs are here https://www.asus.com/Motherboards/H81ME/#specifications

however i have another choice, the asus H87M-E which has 1 x PCIe 3.0/2.0 x16 (x16 mode, yellow) and 3 x PCIe 2.0 x1. im guessing that is a much better choice especially for my gtx 770? full specs are here: https://www.asus.com/Motherboards/H87ME/#specifications

More about : gtx 770 pcie

a b V Motherboard
December 2, 2013 11:52:54 AM

Well, for either board, that top slot is PCIe 3.0 x16, and that will be the only slot you'll be able to fit that video card into. The card simply won't fit into the x1 slots. You won't have any bottlenecking in either setup.
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a c 254 U Graphics card
a c 180 V Motherboard
December 2, 2013 11:53:57 AM

The Asus -H87M-E would be the better choice for your GTX-770 video card.
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December 2, 2013 11:57:05 AM

Im confused, the h81m-e doesnt have a 3.0 slot, or do you mean the highest slot on a motherboard is 3.0
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a c 254 U Graphics card
a c 180 V Motherboard
December 2, 2013 12:09:17 PM

Usually a motherboard will state in the specs what the Pci-e slots are and I don't see anywhere that says that top slot is Pci-e 3.0. The H87M-E board does but it is also $40 more.
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December 2, 2013 12:13:37 PM

tats what i thought haha, so if i went with the H87m-e, that would be compatible and not slow down my gtx 770 right? im also getting he i5 4670 @3.4ghz, so it should all be fine with this board right?
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a c 254 U Graphics card
a c 180 V Motherboard
December 2, 2013 12:15:34 PM

Yes it should , the board was made for the LGA 1150 CPU and that's what the 4670 is and it will work fine with the GTX 770.
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December 2, 2013 12:17:43 PM

ahah well thanks, glad i looked it up in the first place, had i just left it then there would have been a huge problem trying to run a gtx 770 with x1 speed ahah, the website i got my pc build from should have stated the mobo pci slots tbh
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a b V Motherboard
December 2, 2013 1:15:04 PM

Pea_Head said:
Im confused, the h81m-e doesnt have a 3.0 slot, or do you mean the highest slot on a motherboard is 3.0


Actually, I meant the top slot, as in the one closest to the CPU.

It's the CPU that establishes the PCIe speed, and in this case the only CPU that would fit would be a Haswell architecture on socket 1150, which is only PCIe 3.0. The x1 slots are from the chipset, and thus PCIe 2.0.

I have no idea why Asus wouldn't label the PCIe generation on that slot config. Well, maybe a small idea. Technically, the motherboard has no PCIe x16 controller, since it is controlled by the CPU. Maybe they decided that since it was controlled by the CPU, they couldn't label it as 3.0 because Intel might come out with a chip that fits that board that doesn't do 3.0.
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December 2, 2013 1:23:53 PM

Oh i see, well im gonna go with the h87m-e, as well as the i5 4670 and gtx 770. So all of them will be compatible without bottlenecking o casuing performance loss right?
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December 2, 2013 1:27:50 PM

also, i thought the gpu connects to the motherboard and notthe cpu, so even if the cpu was a 3.0 pcie, if the motherboard was a 1.0 pcie, wouldnt that cause terrible perfrmance for the card?
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a b V Motherboard
December 2, 2013 2:40:45 PM

Pea_Head said:
also, i thought the gpu connects to the motherboard and notthe cpu, so even if the cpu was a 3.0 pcie, if the motherboard was a 1.0 pcie, wouldnt that cause terrible perfrmance for the card?


Intel moved the PCIe controller into the CPU in the first incarnation of the Core iX series. What you're talking about here hasn't been the case in quite a while.

Some motherboards do use switches to switch some of the PCIe lanes from one slot to another, and if those switches are only PCIe 2.0, the second slot will run at PCIe 2.0, however there aren't too many companies out there that cheat that way. (Unfortunately, I have one. Gigabyte sucks, BTW.) It wouldn't cause horrible performance, though. A GTX770 could run at PCIe 1.1 and still be just fine. It might lose about 2-3% performance, but it wouldn't be enough to notice.
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