looking for inexpensive x570 that can do 16x/8x on both pcie slots

[DemonicRyzen666]

Not quite what OP's looking for, regardless.
View attachment 374087View attachment 374088

As far as I can tell, *all* x570 boards are limited to x16 to the 'cpu-connected slot(s)'. They are bifurcatable, but limited to x16 being allotted.
x4 go to the X570 Chipset, and I believe the other x4 are used for primary on-board devices (USB, etc.).
tl;dr: You're not going to find an X570 board w/ >x16 lanes off the CPU, accessible.

Without going into custom mountings and assortments of risers, you're stuck w/ x8/x8 (maybe, x12/x4), etc.

Theres only about maybe 10 or less boards that actually do 8x/8x for the x570, the rest all do 16x/4x

 

[inquisitor1]

Theres only about maybe 10 or less boards that actually do 8x/8x for the x570, the rest all do 16x/4x

wow dam, thats sucks. I hadnt realized that. looking back on older cpu has it always been this way?

what about those who did sli or tri sli? they were running 16/4/4 ? that doesnt sound right...

 

[DemonicRyzen666]

wow dam, thats sucks. I hadnt realized that. looking back on older cpu has it always been this way?

what about those who did sli or tri sli? they were running 16/4/4 ? that doesnt sound right...

Theres only five S.L.I certified boards for the x570 on AM4. I have on in my systems it's the MSI MEG ACE x570.
I think the x470 had more slightly more.
The TRX40/WRX80 & both the newer workstation/HEDT boards that use RDDR5 TRX50 & WRX90 still have support for S.L.I.
People don't even know that all of AMD's RDNA GPU's from the 5,000 series to the 7,000 series can run mGPU in dual card mode. ¯\_(ツ)_/¯
It's listed in almost every manual that is says it support AMD multi-GPU setup usually still even today.

 

[Apocalypsee]

why are these cpu limited this way? no matter if its a 5600x or 5950x, only 24 lanes?

Because both uses the same IO die.

Way back then we have chips like nvidia NF200 that have 32 lanes for SLI/Quad SLI but since that no longer a 'thing' people no longer use them.

 

[chrcoluk]

Not quite what OP's looking for, regardless.
View attachment 374087View attachment 374088

As far as I can tell, *all* x570 boards are limited to x16 to the 'cpu-connected slot(s)'. They are bifurcatable, but limited to x16 being allotted.
x4 go to the X570 Chipset, and I believe the other x4 are used for primary on-board devices (USB, etc.).
tl;dr: You're not going to find an X570 board w/ >x16 lanes off the CPU, accessible.

Without going into custom mountings and assortments of risers, you're stuck w/ x8/x8 (maybe, x12/x4), etc.

Interestingly my b450 pro 4 uses 20 lanes for PCIe slots from CPU, I was a bit confused first with manual and spec page, but did end up testing it once the 3080 FE was available as a spare 16 lane GPU, and sure enough it has 16 lanes to first PCIe CPU slot and another 4x to the second, although that second slot will be disabled if the first M.2 is populated, as they both share the 4x wire. Bet there is other b450 boards that just have the 4x hard wired to M.2 with no option to use those 4 lanes for a PCIe slot.

Its a shame innovation of this stuff isnt as common these days. Although given the trend for CPU lanes to be dedicated bandwidth to whatever they connected to which really restricts innovation, I still feel AMD should move 4 lanes from CPU to chipset, and then just go all out on bandwidth sharing on the chipset which will allow great boards to be made like my Z690 Steel Legend. It is capable of well over saturating its 8 chipset lanes, but almost none of the chipset stuff will disable each other when used. Only 1 out of 8 SATA ports is lost if everything else on the board is used. If there was a Z690 Steel Legend equivalent for AM5, I would probably be on a 9800X3D at this point.

 

[inquisitor1]

20 lanes only and no 2nd pci slot if you have an nvme..thats a ripoff. wth

not sure why os/mfr never pushed for multi gpu use. not sli not crossfire

in davinci resolve it allows multi gpu use. and there is a significant jump in perfornmance

it also has the ability to let you run 1 gpu to do the gui and the other to do the computing

its why Im asking for an 8x+8x or even 16x+8x board

 

[igormp]

20 lanes only and no 2nd pci slot if you have an nvme..thats a ripoff. wth

not sure why os/mfr never pushed for multi gpu use. not sli not crossfire

in davinci resolve it allows multi gpu use. and there is a significant jump in perfornmance

it also has the ability to let you run 1 gpu to do the gui and the other to do the computing

its why Im asking for an 8x+8x or even 16x+8x board

Ryzen AM4 CPUs only have a total of 24 lanes, 4 of which go into the chipset, so there's nothing much that can be done in this regard, no matter which motherboard you use. That Asus ACE one was smart and used an x8 link into the chipset, but it you plug a 4.0 x8 device in there it'll still be bottlenecked by the 4.0 x4 uplink from the chipset to the CPU. A PCIe 3.0 x8 device, however, can run at full speed with no bottlenecks.
AM5 CPUs bumped this to a total of 28 lanes, with 4 still reserved to the chipset, so in theory you could have x8/x8/x8 straight out of the CPU, but I'm not aware of any motherboard that does so.
This still does allow for x8/x8 plus 2 NVMes out of the CPU (both at x4), instead of a single one like on AM4.

I guess the biggest use of mGPU nowadays is for machine learning stuff, which can make a really good use of it.

 

[inquisitor1]

Ryzen AM4 CPUs only have a total of 24 lanes, 4 of which go into the chipset, so there's nothing much that can be done in this regard, no matter which motherboard you use. That Asus ACE one was smart and used an x8 link into the chipset, but it you plug a 4.0 x8 device in there it'll still be bottlenecked by the 4.0 x4 uplink from the chipset to the CPU. A PCIe 3.0 x8 device, however, can run at full speed with no bottlenecks.
AM5 CPUs bumped this to a total of 28 lanes, with 4 still reserved to the chipset, so in theory you could have x8/x8/x8 straight out of the CPU, but I'm not aware of any motherboard that does so.
This still does allow for x8/x8 plus 2 NVMes out of the CPU (both at x4), instead of a single one like on AM4.

I guess the biggest use of mGPU nowadays is for machine learning stuff, which can make a really good use of it.

possible to use the 2nd pci slot at 4x for gui ? in davinci resolve, top slot 16x, bottom 4x and you can configure 1 card for compute, the other for GUI. would that work? does gui need more then 4x?

 

[igormp]

possible to use the 2nd pci slot at 4x for gui ?

yeah, sure.

would that work? does gui need more then 4x?

I do believe so. I don't think you'd need more than 4x.
But if you just want a GPU for display, why not use a really cheap, low end one in the x4 (or even x1 with an adaptor), while your main GPU lives off in the main slot?

 

[inquisitor1]

yeah, sure.

I do believe so. I don't think you'd need more than 4x.
But if you just want a GPU for display, why not use a really cheap, low end one in the x4 (or even x1 with an adaptor), while your main GPU lives off in the main slot?

yes I have a 1070 that would do gui and another card im trying to aquire. 2080ti/3080/3080ti/3090. whatever used deal I can find.

thanks for the help. its very much appreciated!