AMD Discussion

[cube]

http://semiaccurate.com/2016/09/05/amd-releases-bristol-ridge-7th-generation-apu/

I don't want to do multi GPU. [I know Bristol has only x8 GPU. This is for Ryzen. Although I guess x4 for an RX 460 would be OK, as it runs quite nice over TB1.]

 

[cube]

I think maybe an X370 motherboard would work for non-GPU.

They have at most two 3.0 slots.

But while they advertise x8/x8, I'm not sure if they would support x4/x4 with Bristol.

 

[cube]

The specs of one motherboard only state x8/x0 for Bristol

The specs of one motherboard state it supports 3-way CrossFireX x8/x4/x4, but it only has two 3.0 slots, and there's no mention of this mode in the manual.

There's no x8/x8 or x8/x4/x4 B350 boards even if the chipset is supposed to support CrossFire.

 

[xsmi123]

The x8x4x4, I'm guessing would be Bristol plus two GPU's. But I don't think you can crossfire that way can you? I do know that the x370 boards are the boards that are marketed as enthusiasts multi GPU boards.

 

[cube]

The x8x4x4, I'm guessing would be Bristol plus two GPU's. But I don't think you can crossfire that way can you? I do know that the x370 boards are the boards that are marketed as enthusiasts multi GPU boards.

If you use Athlon, it would be 3 cards.

But Bristol would be able of maximum x4/x2/x2 theoretically.

But I am not interested in CrossFire, just that 2 other slots besides the GPU can be used in 3.0 mode, without using up the M.2 lanes.

BTW, with Bristol, the M.2 is x2.

So, in x4/x4 mode, you could run an SSD faster.

 

[xsmi123]

Now THAT'S cool.

 

[cube]

I found several MSI B350 motherboards which should support CrossFire 3.0 x8/x8 with Ryzen.

None in the other brands.

 

[xsmi123]

Looks like plenty of the x370 boards will offer the slots you need.

 

[cube]

Looks like plenty of the x370 boards will offer the slots you need.

I wanted a cheaper board.

And the two MSI that I checked don't look good (the manual shows one 3.0 slot and the x1 must be empty to use CrossFire)

Anyway, not great boards, only 4 SATA ports, only two with Gen2, and there you have to choose between SPDIF or 7.1+RAID.

Even with X370, only two 3.0 slots from the GPU lanes is skimpy.

 

[xsmi123]

Right. Thats one of the shortcomings of the Ryzen platform on the whole. I feel they should have provided more PCIe lanes from 6 and 8 core procs.

 

[AidenShaw]

Right. Thats one of the shortcomings of the Ryzen platform on the whole. I feel they should have provided more PCIe lanes from 6 and 8 core procs.

That's why we have PCIe switches.

Oversubscription is OK.

 

[cube]

Are there x16 PLX that can switch both x16 to x8/x8 and x8 to x4/x4 ?

Or even better, all of x8/x8, x4/x4, x8/x4/x4, x4/x2/x2 ?

I guess it's no problem to even go x8/x4/x2/x2, x4/x2/x1/x1, x8/x4/x2/x1/x1, x4/x1/x1/x1/x1.

And you can even sell a taller board for the 2.0 ports.

It seems like motherboard vendor shortsightedness.

 

[cube]

I think understand what the MSI specs meant now.

Gen3(16,8) meant x16 with Ryzen and x8 with Bristol, not one x16 slot plus one x8 slot.

 

[AidenShaw]

Are there x16 PLX that can switch both x16 to x8/x8 and x8 to x4/x4 ?

Or even better, all of x8/x8, x4/x4, x8/x4/x4, x4/x2/x2 ?

I guess it's no problem to even go x8/x4/x2/x2, x4/x2/x1/x1, x8/x4/x2/x1/x1, x4/x1/x1/x1/x1.

And you can even sell a taller board for the 2.0 ports.

It seems like motherboard vendor shortsightedness.

PLX switches are very flexible - a good overview is at http://www.anandtech.com/show/9245/avago-announces-plx-pex9700-series-pcie-switches . The port/lane assignments are configurable.

 

[cube]

I don't think you even need one of these switches for x16 to x16, but for x16 to x32.

 

[AidenShaw]

I don't think you even need one of these switches for x16 to x16, but for x16 to x32.

You mean x16 to 2*x16, right?

 

[cube]

You mean x16 to 2*x16, right?

Because of the various configurations, I was adding up the total number of active lanes.

 

[Joe The Dragon]

Right. Thats one of the shortcomings of the Ryzen platform on the whole. I feel they should have provided more PCIe lanes from 6 and 8 core procs.

that would needed an different socket also they seem to reworking on an high end cpu / server chip with more pci-e as well the 128 pci-e dual or single cpu server systems
[doublepost=1492709818][/doublepost]

PLX switches are very flexible - a good overview is at http://www.anandtech.com/show/9245/avago-announces-plx-pex9700-series-pcie-switches . The port/lane assignments are configurable.

View attachment 696902

spanning tree safe?

 

[AidenShaw]

spanning tree safe?

No idea - but since they're selling a chip to be soldered to a PCB maybe they could assume that the builder will read the specs and not do stupid things.

 

[xsmi123]

PLX Motherboards are kind of expensive. I just bought my son one for his 7700K system.

 

[AidenShaw]

PLX Motherboards are kind of expensive. I just bought my son one for his 7700K system.

Sorry, but are you surprised that high-end motherboards are kind of expensive?

And do you think that the price of the motherboard was due solely to the PLX chip, or maybe to the motherboard's support for quad SLI on four x16 slots?

The MP6,1 has a PLX PCIe switch embedded in it. And I see people say that the MP6,1 is competitively priced.

 

[cube]

PLX Motherboards are kind of expensive. I just bought my son one for his 7700K system.

Use MUXes and live with x8 graphics (or x4 with Bristol).

 

[cube]

This userbenchmark site not only has always appeared biased in favor in Intel and NVIDIA, but their "market share" numbers do not seem reliable (some moving around on reload, dubious Ryzen 1700 drop).

 

[xsmi123]

Which site?

 

[cube]

It also looks like the voting system has kind of stalled in the last weeks.

Do not look for an "about us" page. It has never been there.