How fast a PCI express port is needed to prober use of Nvidia GTX760

faitfull · Nov 21, 2016

I currently have a Nvidia GTX760 2GB from a friend.
However I only have some mainboards that have PCI express 2.0 16x ports and not so much max speed.

I can understand that while the GTX760 is build to run in a PCI express 3.0 16x port, it never needed a full 2.0 port to begin with.... However I cannot find information on how much it actually needs? and if 4x is not fast enogh, how much is needed?

Link to GTX760 Here

What would happen if it where to run on a 8x speed pci express 16 port?

What would happen if it where to run on a 4x speed pci express 16 port?

xFeaRDom · Nov 21, 2016

PCIe lanes, as you may know are backwards compatible, and the performance loss between PCIe 3.0 and 2.0 are very minimal, and is not really noticed. I have a GTX 970 on a PCIe 2.0 slot, and it runs better, if not the same than other benchmarked GTX 970s, so there's nothing to worry about when using it on a 2.0 slot.

When it comes to x8 and x4, the way I look at it is that it halves the performance, and quarters the performance, although the slots are not build for GPUs, you would need to get a PCIe x8 to x16 converter for it to fit into the slot and function correctly, as they have a different amount of pins to connect to the GPU.

This logic is backed up by this: http://www.gamersnexus.net/guides/2488-pci-e-3-x8-vs-x16-performance-impact-on-gpus

faitfull · Nov 21, 2016

xFeaRDom :

I have PCIe 2.0 16x port in both the possible mainboards. However when you study the chipset, they have some maximum support speed. here is a link to one of my solutions H61 chipset
-
Expansion Options
PCI Support No Legacy PCI
PCI Express Revision 2.0
PCI Express Configurations ‡ x1, x2, x4
Max # of PCI Express Lanes 6

I am to understand that the x4 configuration should grant me 2000MB/s connection... but I do not know how much, it takes to run Nvidia GTX760 decent....
building new computer out of old parts. My own old computer is really really old (core2 quad 6600 build)

xFeaRDom · Nov 21, 2016

Oh right I see what you mean, as the PCIe lanes can only run at x1, x2 and x4, this will theoretically, quarter the bandwidth of a full PCIe 2.0 lane, and so on.

There will most likely be a noticeable difference, don't you have a small budget to buy a second hand motherboard for your components, if it has a PCIe 2.0 x16 lane, it will provide great performance compared to the x4 lanes.

faitfull · Nov 21, 2016

xFeaRDom :

My budget is extremly tight at the moment. not in job right now..... so the wallet is hurting
And not sure I can find such a second hand board where I live

I do have another board with PCI 2.0 8x speed lanes. But then I go from a core i7 3770k (3.gen highend) down to a core i5-750 (1.gen) processor that uses more electricity and are a good strong part slower.

Really trying to figure out here, what to do!

that said... if the card dont really need more than ... lets say 4x lanes or so.. then I hope there is no need to go invest more money on stuff

xFeaRDom · Nov 21, 2016

faitfull :

It highly depends what you're using it for, gaming, you'll only get 1/4 of the performance you can theoretically get with x16, and therefore much lower FPS and settings you can get. Im sure you can find a nice motherboard on Ebay or something to increase the performance.

Dunlop0078 · Nov 21, 2016

You want to run a single 760? A single 760 will run at pcie 2.0 x16 on an h61 board, which will by no means limit a gtx 1080 in any significant way never mind a gtx 760. The cpu has 16 lanes of its own to communicate to the gpu, from my understanding the H61 chipset has nothing to do with the communication of the cpu and gpu.

faitfull · Nov 21, 2016

Dunlop0078 :

This is really really interresting....

that said the 16 lanes.. is that only for inbuild processor graphic? or to the PCIe-2 16x port for a ordinary graphic card? trying to understand it all... somehow new to me

Dunlop0078 · Nov 21, 2016

The integrated graphics don't need pci lanes, its inside the cpu, something that is inside the cpu does not need to use pci lanes to communicate with the cpu. Almost all modern platforms are built this why, its much more efficient to have the cpu communicate directly with the gpu avoiding the chipset entirely, this likely reduces latency among other things im sure. I think this happened when intel got rid of the north bridge on its motherboards which used to perfom that function. For H61 all the chipset does is handle usb, the nic, audio, and 6 pcie lanes for maybe a sound card or some other add in card.

faitfull · Nov 21, 2016

Dunlop0078 :

If this is truly the truth! Then YOU sir are a lifesaver... THank you so very much!

Dunlop0078 · Nov 21, 2016

faitfull :

Lol no problem. I am 100% sure an H61 board will run a gtx 760 at pci 2.0 x16. If you want post your motherboard make and model and I will try to find some proof.

faitfull · Nov 21, 2016

Dunlop0078 :

Please do, It would be amazing to see! *running around my home celebrating*

ASUS P8H61-M PRO CM/CM6630-8/DP_MB however not sure if I can update the bios... should be possible to take the better processor....

It comes from this computer LINK

so it claims to be a P8H61M Pro (this is link to what it claims to be)

Dunlop0078 · Nov 21, 2016

Well I was hoping to find a screenshot of someone with gpu-z and that motherboard, but I cant find any on google if there are some they are too blurry to read. I found this quote in your manual "This motherboard has a PCI Express 2.0 x16 slot that supports PCI Express x16 2.0 graphic cards complying with the PCI Express specifications". I'm afraid that quote and that diagram I posted above is the best I'm going to do as far as proof. It will run a a 760 at pci 2.0 x16, if you don't want to take my word for it keep looking on google or try it for yourself. Do you already have a cpu for that board?

faitfull · Nov 21, 2016

Dunlop0078 :

thank you so much for looking!

Yes, I have a core i5-2320 and a core i7-3770k that it should be able to use with a bios update

Dunlop0078 · Nov 21, 2016

faitfull :

It will support the 3770k with bios revision 3705. You might already have it, it should say in your bios menu somewhere. I would check which revision you have before you try to update.

faitfull · Nov 21, 2016

Dunlop0078 :

faitfull :

It will support the 3770k with bios revision 3705. You might already have it, it should say in your bios menu somewhere. I would check which revision you have before you try to update.

Have tryed the i7 out... does not run.... so it needs the update... have seen this behavior before on another computer.

how do I see what revision it is? it is proberly 1 or 2

Dunlop0078 · Nov 22, 2016

Well I believe your bios is similar to mine. It should say it right where mine does in this screenshot below.

faitfull · Nov 22, 2016

How fast a PCI express port is needed to prober use of Nvidia GTX760

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