Are PCIe lanes dynamically assigned? Announcing the arrival of Valued Associate #679: Cesar...
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Are PCIe lanes dynamically assigned?
Announcing the arrival of Valued Associate #679: Cesar Manara
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I want to use multiple GPUs on my motherboard (Asus Crosshair Hero VII) (CPU: Ryzen 7 2700x)
If I have 2 GPUs and use only the main one (x16) to do normal tasks, but use both for machine learning and 3D rendering, will the lanes be split dynamically?
In other words: If I run a task only on my main GPU, are all the 16 PCIe lanes be available to that GPU, or will they always stay split (8x for each GPU) without regard to the work load?
motherboard gpu pci-express amd-ryzen
edited 9 hours ago
K7AAY
3,96821638
asked 11 hours ago
Émerick PoulinÉmerick Poulin
82
New contributor
Émerick Poulin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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I want to use multiple GPUs on my motherboard (Asus Crosshair Hero VII) (CPU: Ryzen 7 2700x)
If I have 2 GPUs and use only the main one (x16) to do normal tasks, but use both for machine learning and 3D rendering, will the lanes be split dynamically?
In other words: If I run a task only on my main GPU, are all the 16 PCIe lanes be available to that GPU, or will they always stay split (8x for each GPU) without regard to the work load?
motherboard gpu pci-express amd-ryzen
edited 9 hours ago
K7AAY
3,96821638
asked 11 hours ago
Émerick PoulinÉmerick Poulin
82
New contributor
Émerick Poulin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I want to use multiple GPUs on my motherboard (Asus Crosshair Hero VII) (CPU: Ryzen 7 2700x)
If I have 2 GPUs and use only the main one (x16) to do normal tasks, but use both for machine learning and 3D rendering, will the lanes be split dynamically?
In other words: If I run a task only on my main GPU, are all the 16 PCIe lanes be available to that GPU, or will they always stay split (8x for each GPU) without regard to the work load?
motherboard gpu pci-express amd-ryzen
edited 9 hours ago
K7AAY
3,96821638
asked 11 hours ago
Émerick PoulinÉmerick Poulin
82
New contributor
Émerick Poulin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I want to use multiple GPUs on my motherboard (Asus Crosshair Hero VII) (CPU: Ryzen 7 2700x)
If I have 2 GPUs and use only the main one (x16) to do normal tasks, but use both for machine learning and 3D rendering, will the lanes be split dynamically?
In other words: If I run a task only on my main GPU, are all the 16 PCIe lanes be available to that GPU, or will they always stay split (8x for each GPU) without regard to the work load?
motherboard gpu pci-express amd-ryzen
motherboard gpu pci-express amd-ryzen
edited 9 hours ago
K7AAY
3,96821638
asked 11 hours ago
Émerick PoulinÉmerick Poulin
82
New contributor
Émerick Poulin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 9 hours ago
K7AAY
3,96821638
asked 11 hours ago
Émerick PoulinÉmerick Poulin
82
New contributor
Émerick Poulin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 9 hours ago
K7AAY
3,96821638
edited 9 hours ago
K7AAY
3,96821638
edited 9 hours ago
K7AAY
3,96821638
3,96821638
asked 11 hours ago
Émerick PoulinÉmerick Poulin
82
New contributor
Émerick Poulin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 11 hours ago
Émerick PoulinÉmerick Poulin
82
asked 11 hours ago
Émerick PoulinÉmerick Poulin
82
82
New contributor
Émerick Poulin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Émerick Poulin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Émerick Poulin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
The bad news first:
PCIe lanes are dynamic, but not the way you want: They are assigned (dynamically) at PCI configuration time, which is immediately after power on (if you ignore hot-plugable busses). Once the system is booting, there will be no more dynamic reallocation.
Now for the good news:
First of all it is very unlikely that you can saturate a Gen3 x16 PCIe bus with any AMD GPU in existance, not even an x8. The bottleneck will be the processing inside the card, not the data transfer via the bus - this ofcourse means, you will be very hard pressed to notice a difference.
answered 11 hours ago
Eugen RieckEugen Rieck
11.5k22429
add a comment |
It depends on the motherboard design.
If your motherboard does not have enough PCIe lanes (generally the case with recent Intel consumer CPUs or chipsets) then the motherboard will dynamically assign lanes; e.g.
X16 or X8
unused X8
On the other hand, on Xeon motherboards, older intel boards (e.g. X55/Nehalem)
or AMD platforms the setup is typically more like this:
X16 or X16
X16 x8
x0 x8
x8 x8
x8 x8
Notice the second pair which is the same x16/0 and x8/x8 combination
Now for your specific motherboard:
According the Asus website it supports: "2 x PCIe (x16 or dual x8)" (plus others)
I read that as:
X16 or X8
unused X8
So you can use two graphics cards at x8. That is more than fast enough for just about any card. If you run two EUR1000+ cards then you might loose 2%-5% ish. But for anything up to regular high end cards PCI-e v3 x8 is more than enough.
answered 11 hours ago
HennesHennes
59.5k793145
add a comment |
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2 Answers
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active
oldest
votes
2 Answers
2
active
oldest
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votes
The bad news first:
PCIe lanes are dynamic, but not the way you want: They are assigned (dynamically) at PCI configuration time, which is immediately after power on (if you ignore hot-plugable busses). Once the system is booting, there will be no more dynamic reallocation.
Now for the good news:
First of all it is very unlikely that you can saturate a Gen3 x16 PCIe bus with any AMD GPU in existance, not even an x8. The bottleneck will be the processing inside the card, not the data transfer via the bus - this ofcourse means, you will be very hard pressed to notice a difference.
answered 11 hours ago
Eugen RieckEugen Rieck
11.5k22429
add a comment |
The bad news first:
PCIe lanes are dynamic, but not the way you want: They are assigned (dynamically) at PCI configuration time, which is immediately after power on (if you ignore hot-plugable busses). Once the system is booting, there will be no more dynamic reallocation.
Now for the good news:
First of all it is very unlikely that you can saturate a Gen3 x16 PCIe bus with any AMD GPU in existance, not even an x8. The bottleneck will be the processing inside the card, not the data transfer via the bus - this ofcourse means, you will be very hard pressed to notice a difference.
answered 11 hours ago
Eugen RieckEugen Rieck
11.5k22429
add a comment |
The bad news first:
PCIe lanes are dynamic, but not the way you want: They are assigned (dynamically) at PCI configuration time, which is immediately after power on (if you ignore hot-plugable busses). Once the system is booting, there will be no more dynamic reallocation.
Now for the good news:
First of all it is very unlikely that you can saturate a Gen3 x16 PCIe bus with any AMD GPU in existance, not even an x8. The bottleneck will be the processing inside the card, not the data transfer via the bus - this ofcourse means, you will be very hard pressed to notice a difference.
answered 11 hours ago
Eugen RieckEugen Rieck
11.5k22429
The bad news first:
PCIe lanes are dynamic, but not the way you want: They are assigned (dynamically) at PCI configuration time, which is immediately after power on (if you ignore hot-plugable busses). Once the system is booting, there will be no more dynamic reallocation.
Now for the good news:
First of all it is very unlikely that you can saturate a Gen3 x16 PCIe bus with any AMD GPU in existance, not even an x8. The bottleneck will be the processing inside the card, not the data transfer via the bus - this ofcourse means, you will be very hard pressed to notice a difference.
answered 11 hours ago
Eugen RieckEugen Rieck
11.5k22429
answered 11 hours ago
Eugen RieckEugen Rieck
11.5k22429
answered 11 hours ago
Eugen RieckEugen Rieck
11.5k22429
answered 11 hours ago
Eugen RieckEugen Rieck
11.5k22429
11.5k22429
add a comment |
add a comment |
It depends on the motherboard design.
If your motherboard does not have enough PCIe lanes (generally the case with recent Intel consumer CPUs or chipsets) then the motherboard will dynamically assign lanes; e.g.
X16 or X8
unused X8
On the other hand, on Xeon motherboards, older intel boards (e.g. X55/Nehalem)
or AMD platforms the setup is typically more like this:
X16 or X16
X16 x8
x0 x8
x8 x8
x8 x8
Notice the second pair which is the same x16/0 and x8/x8 combination
Now for your specific motherboard:
According the Asus website it supports: "2 x PCIe (x16 or dual x8)" (plus others)
I read that as:
X16 or X8
unused X8
So you can use two graphics cards at x8. That is more than fast enough for just about any card. If you run two EUR1000+ cards then you might loose 2%-5% ish. But for anything up to regular high end cards PCI-e v3 x8 is more than enough.
answered 11 hours ago
HennesHennes
59.5k793145
add a comment |
It depends on the motherboard design.
If your motherboard does not have enough PCIe lanes (generally the case with recent Intel consumer CPUs or chipsets) then the motherboard will dynamically assign lanes; e.g.
X16 or X8
unused X8
On the other hand, on Xeon motherboards, older intel boards (e.g. X55/Nehalem)
or AMD platforms the setup is typically more like this:
X16 or X16
X16 x8
x0 x8
x8 x8
x8 x8
Notice the second pair which is the same x16/0 and x8/x8 combination
Now for your specific motherboard:
According the Asus website it supports: "2 x PCIe (x16 or dual x8)" (plus others)
I read that as:
X16 or X8
unused X8
So you can use two graphics cards at x8. That is more than fast enough for just about any card. If you run two EUR1000+ cards then you might loose 2%-5% ish. But for anything up to regular high end cards PCI-e v3 x8 is more than enough.
answered 11 hours ago
HennesHennes
59.5k793145
add a comment |
It depends on the motherboard design.
If your motherboard does not have enough PCIe lanes (generally the case with recent Intel consumer CPUs or chipsets) then the motherboard will dynamically assign lanes; e.g.
X16 or X8
unused X8
On the other hand, on Xeon motherboards, older intel boards (e.g. X55/Nehalem)
or AMD platforms the setup is typically more like this:
X16 or X16
X16 x8
x0 x8
x8 x8
x8 x8
Notice the second pair which is the same x16/0 and x8/x8 combination
Now for your specific motherboard:
According the Asus website it supports: "2 x PCIe (x16 or dual x8)" (plus others)
I read that as:
X16 or X8
unused X8
So you can use two graphics cards at x8. That is more than fast enough for just about any card. If you run two EUR1000+ cards then you might loose 2%-5% ish. But for anything up to regular high end cards PCI-e v3 x8 is more than enough.
answered 11 hours ago
HennesHennes
59.5k793145
It depends on the motherboard design.
If your motherboard does not have enough PCIe lanes (generally the case with recent Intel consumer CPUs or chipsets) then the motherboard will dynamically assign lanes; e.g.
X16 or X8
unused X8
On the other hand, on Xeon motherboards, older intel boards (e.g. X55/Nehalem)
or AMD platforms the setup is typically more like this:
X16 or X16
X16 x8
x0 x8
x8 x8
x8 x8
Notice the second pair which is the same x16/0 and x8/x8 combination
Now for your specific motherboard:
According the Asus website it supports: "2 x PCIe (x16 or dual x8)" (plus others)
I read that as:
X16 or X8
unused X8
So you can use two graphics cards at x8. That is more than fast enough for just about any card. If you run two EUR1000+ cards then you might loose 2%-5% ish. But for anything up to regular high end cards PCI-e v3 x8 is more than enough.
answered 11 hours ago
HennesHennes
59.5k793145
edited 6 hours ago
answered 11 hours ago
HennesHennes
59.5k793145
answered 11 hours ago
HennesHennes
59.5k793145
answered 11 hours ago
HennesHennes
59.5k793145
59.5k793145
add a comment |
add a comment |
Émerick Poulin is a new contributor. Be nice, and check out our Code of Conduct.
Émerick Poulin is a new contributor. Be nice, and check out our Code of Conduct.
Émerick Poulin is a new contributor. Be nice, and check out our Code of Conduct.
Émerick Poulin is a new contributor. Be nice, and check out our Code of Conduct.
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