Question about PCIe

[krtislav]

Hello everybody
I need to ask you one question, because I am confused about this PCIe slots.
As I know, the newest card have support for PCIe 3.0, and I went to search for some motherboards that would support it. And now there comes confusion: on Intel supported motherboards says that it has PCIe 3.0 slot, and on AMD supported motherboards don't mention anything about 3.0, even 400$ ones.
But I saw this:
1 x PCIe 2.0 x16 (x4 mode)
1 x PCIe 2.0 x1
2 x PCI That says for AMD motherboard

What does that means. Does that support PCIe 3.0?
(newbie on this obviously)

 

[Parman]

I would suspect no. It will say that it has PCIe 3.0 if it has it. I just got one for my parents a few months back.

1x PCIe 2.0 x16 = there is once slot for a full x16 PCIe 2.0 port.

1 x PCIe 2.0 x1 = a x1 slot port they're smaller .

2 x PCI are just 2 PCI slots.

 

[krtislav]

OK, but lets take a look at this:
ASUS - Motherboards- ASUS Crosshair V Formula-Z

3 x PCIe 2.0 x16 (dual x16 or x16/x8/x8)
1 x PCIe 2.0 x16 (x4 mode)
2 x PCIe 2.0 x1 This is 400$ motherboard
Why would anyone make a 400$ motherboard without PCIe 3.0?

 

[Parman]

because people are crazy

plus i cant say this 100% but i only see PCIe 3.0 slots on Intel boards.

 

[Erick Aguilar]

OK, but lets take a look at this:
ASUS - Motherboards- ASUS Crosshair V Formula-Z

3 x PCIe 2.0 x16 (dual x16 or x16/x8/x8)
1 x PCIe 2.0 x16 (x4 mode)
2 x PCIe 2.0 x1 This is 400$ motherboard
Why would anyone make a 400$ motherboard without PCIe 3.0?

Because nobody needs pcie 3.0 and you don't need to use 3.0 to charge 400 for a motherboard.

 

[alphanumeric]

OK, but lets take a look at this:
ASUS - Motherboards- ASUS Crosshair V Formula-Z

3 x PCIe 2.0 x16 (dual x16 or x16/x8/x8)
1 x PCIe 2.0 x16 (x4 mode)
2 x PCIe 2.0 x1 This is 400$ motherboard
Why would anyone make a 400$ motherboard without PCIe 3.0?

It may have been designed/manufactured before PCIe 3.0 was mainstream. Old stock.

 

[krtislav]

so you say that PCIe 2.0 x16 will do just fine with AMD HD 7750?

 

[Erick Aguilar]

so you say that PCIe 2.0 x16 will do just fine with AMD HD 7750?

You will see no difference whatsoever if you use it on a pcie3.0 supporting motherboard.
The technology is still not optimized that well to show a dramatic increase in performance.

All that I can see happening is that in multiple gpu configurations you will be able to use 3x pcie x16 slots without distributing the bandwidth.

 

[krtislav]

so you say that PCIe 2.0 x16 will do just fine with AMD HD 7750?

You will see no difference whatsoever if you use it on a pcie3.0 supporting motherboard.
The technology is still not optimized that well to show a dramatic increase in performance.

All that I can see happening is that in multiple gpu configurations you will be able to use 3x pcie x16 slots without distributing the bandwidth.

OK, thanks
I just want someone to confirm what you say, it's not that I don't believe you, it's that that I don't want to spend money unsecurely

 

[Erick Aguilar]

so you say that PCIe 2.0 x16 will do just fine with AMD HD 7750?

You will see no difference whatsoever if you use it on a pcie3.0 supporting motherboard.
The technology is still not optimized that well to show a dramatic increase in performance.

All that I can see happening is that in multiple gpu configurations you will be able to use 3x pcie x16 slots without distributing the bandwidth.

OK, thanks
I just want someone to confirm what you say, it's not that I don't believe you, it's that that I don't want to spend money unsecurely

Look it up on google, you will find answers faster with people who have benchmarked the performance difference between 2.0 and 3.0.

Unless you are planning on doing some serious multi gpu arrays, I see no point in forcing a move to 3.0 and spend extra money just for that. I will wait until it's been implemented as a default technology in motherboards, not while companies are ''inovating'' with it.

 

[krtislav]

You will see no difference whatsoever if you use it on a pcie3.0 supporting motherboard.
The technology is still not optimized that well to show a dramatic increase in performance.

All that I can see happening is that in multiple gpu configurations you will be able to use 3x pcie x16 slots without distributing the bandwidth.

OK, thanks
I just want someone to confirm what you say, it's not that I don't believe you, it's that that I don't want to spend money unsecurely

Look it up on google, you will find answers faster with people who have benchmarked the performance difference between 2.0 and 3.0.

Unless you are planning on doing some serious multi gpu arrays, I see no point in forcing a move to 3.0 and spend extra money just for that. I will wait until it's been implemented as a default technology in motherboards, not while companies are ''inovating'' with it.

lol OK
i just meant to buy 120$ motherboard, nothing serious

 

[krtislav]

Well, you were right

 

[bobafetthotmail]

1 x PCIe 2.0 x16 (x4 mode) 1 x PCIe 2.0 x16 (x4 mode)

WARNING, that "x4 mode" tells you that the slot is x16 physically (so it can fit bigger cards), but is actually a x4 slot, not a x16, as far as speed/bandwidth goes.
ALWAYS CHECK THIS detail, as the slot positioning and what slots share bandwith with what.

Why would anyone make a 400$ motherboard without PCIe 3.0?

the controller for PCIe 3.0 is in the CPU for Intel ones and afaik AMD isn't giving the proverbial damn about the PCIe 3 at all.
THis thread has more info. It basically boils down to "the connection between CPU and motherboard has too limited bandwidth to make more than a single 3.0 x16 slot and some spare change for other stuff" So they either make better sockets or they will live without PCIe3.0.

so you say that PCIe 2.0 x16 will do just fine with AMD HD 7750?

Erick is correct, that card will be fine. Even the GTX 680 (current top dog in GPUs) does only show an academical difference in FPS between PCIe 2 and 3. (a couple frames more for the latter, basically unnoticeable)
THis is a review where they tested such.

I know of most cards from 2011 that have similar results even if compared on a x8 and on a x16 PCIe 2.0.

EDIT: awww... ninja'd by Erik

 

[bobkn]

the controller for PCIe 3.0 is in the CPU for Intel ones and afaik AMD isn't giving the proverbial damn about the PCIe 3 at all.

And yet the AMD 7xxx graphics cards support PCI-E 3.

The reviews that I've seen showed a difference mainly in GPU computing (CUDA or OpenCL).

As I do no GPU computing, it's not a biggie for me.

 

[Erick Aguilar]

the controller for PCIe 3.0 is in the CPU for Intel ones and afaik AMD isn't giving the proverbial damn about the PCIe 3 at all.

And yet the AMD 7xxx graphics cards support PCI-E 3.

The reviews that I've seen showed a difference mainly in GPU computing (CUDA or OpenCL).

As I do no GPU computing, it's not a biggie for me.

It's a marketing strategy, in all honesty I do not know what you must do to make a GPU PCIE 3 compatible, but we also have to remember that AMD does not limit it's GPU market only to AMD products, they are also used by intel which do support pcie 3.0.

The question is, how much of a difference will it make with a single GPU.