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[Videocardz] PSA: AMD B350 motherboards do not support SLI

4K views 52 replies 31 participants last post by  RaduZ 
#1 ·

Quote:
According to ComputerBase, the AMD B350 chipset does support multi-GPU, but only through CrossFire. There is no SLI support. This information is still under NDA despite new motherboards and Ryzen CPUs being available for preorders. I know B350 is the budget-oriented chipset, so multi-GPU is may not be as popular as it will be on X370, but I think it's worth to know this beforehand.
https://videocardz.com/66369/psa-amd-b350-motherboards-do-not-support-sli

If this is true, SLI is only supported on X370 chipset motherboards. According to this rumor, B350 will do CFX but not SLI.
 
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#15 ·
Quote:
GIGABYTE GA-AB350M-Gaming 3 (rev. 1.0) AM4 AMD B350 SATA 6Gb/s USB 3.1 HDMI Micro ATX Motherboards - AMD
OUT OF STOCK. ETA: 3/8/2017.


https://www.newegg.com/Product/Product.aspx?Item=N82E16813145002
Expansion Slots
Quote:
PCI Express 3.0 x16
1 x PCI Express x16 slot, running at x16 (PCIEX16)
* For optimum performance, if only one PCI Express graphics card is to be installed, be sure to install it in the PCIEX16 slot.
* Actual support may vary by CPU.

(The PCIEX16 slot conforms to PCI Express 3.0 standard.)

PCI Express 2.0 x16
1 x PCI Express x16 slot, running at x4 (PCIEX4)
* Actual support may vary by CPU.

PCI Express x1
1 x PCI Express x1 slot

(The PCIEX4 and PCI Express x1 slots conform to PCI Express 2.0 standard.)
Looks like this mATX B350 does too, though at drastically reduced speeds due to the 2.0 x4. A riser-adapter off the m.2 slot would be faster.

Crossfire runs on just about anything with more than 1 PCIe x16 slot physically capable(even x1s with melted out backs) of slotting a compatible card.
 
#16 ·
Quote:
Originally Posted by DesertRat View Post

GIGABYTE GA-AB350M-Gaming 3 (rev. 1.0) AM4 AMD B350 SATA 6Gb/s USB 3.1 HDMI Micro ATX Motherboards - AMD
OUT OF STOCK. ETA: 3/8/2017.


https://www.newegg.com/Product/Product.aspx?Item=N82E16813145002
Expansion Slots
Looks like this mATX B350 does too, though at drastically reduced speeds due to the 2.0 x4. A riser-adapter off the m.2 slot would be faster.

Crossfire runs on just about anything with more than 1 PCIe x16 slot physically capable(even x1s with melted out backs) of slotting a compatible card.
Please ensure you read Wikipedia PCIe power section, https://en.wikipedia.org/wiki/PCI_Express#Power
1x and 4x (electrical) slots, will not provide the appropriate power to the card. In this ASUS board, thankfully they have an 16x electrical, but 4x signal.
 
#18 ·
#20 ·
Quote:
Originally Posted by budgetgamer120 View Post

Can we use that to determine anything? No because it is not a norm. My FuryX does not have that behaviour.
no, i'm implying the implications of exceeding the PCIe power limit, you can look up the whole fiasco blowing out of proportions.
who could've imagined that exceeding the PCIe power limit by a couple of watts was already enough to drive lots of people crazy.
 
#21 ·
Quote:
Originally Posted by budgetgamer120 View Post

What are the 6 and 8 pin power connection on a psu for?
PCIE Slot (up to 75W)
75 W (6-pin) or 150 W (8-pin) power for up to 300 W total (2Ă—75 W + 1Ă—150 W)

So if you have an electrical 1x slot, there is no way it will provide 75W, and if you have a RX 480 with a single 6pin, it will either melt the slot, or the 6pin while trying to draw 150W+ (combined slot + 6pin).

If you have a small passive card (eg: AMD 6450), I have successfully ran it off a 1x slot with a 4pin (floppy) power connector, on a riser board.

HOWEVER, I also melted that 4p connector when I ran an OpenGL stress test
biggrin.gif


edit: link, similar to this: https://www.amazon.com/Fixable-Adapter-Flexible-Extension-Connector/dp/B00IMYODGS
 
#23 ·
Quote:
Originally Posted by manitox View Post

So there will no be cheap rx480- ryzen crossfire setups.?
If you don't consider the b350 boards cheap then no.
 
#24 ·
Quote:
Originally Posted by kevinf View Post

PCIE Slot (up to 75W)
75 W (6-pin) or 150 W (8-pin) power for up to 300 W total (2Ă—75 W + 1Ă—150 W)

So if you have an electrical 1x slot, there is no way it will provide 75W, and if you have a RX 480 with a single 6pin, it will either melt the slot, or the 6pin while trying to draw 150W+ (combined slot + 6pin).

If you have a small passive card (eg: AMD 6450), I have successfully ran it off a 1x slot with a 4pin (floppy) power connector, on a riser board.

HOWEVER, I also melted that 4p connector when I ran an OpenGL stress test
biggrin.gif


edit: link, similar to this: https://www.amazon.com/Fixable-Adapter-Flexible-Extension-Connector/dp/B00IMYODGS
I understand all that. Just saying when did the Rx480 become the standard for PCIE power usage?
confused.gif
 
#25 ·
Quote:
Originally Posted by budgetgamer120 View Post

I understand all that. Just saying when did the Rx480 become the standard for PCIE power usage?
confused.gif
you're misunderstanding the thing about RX480.

RX480 is one of the major precedents in this type of issue, much like how we often use Bulldozer as a basis of "epic fail CPU".
it should be noted that the "RX480 exceeding PCIe power limit" thing started the whole "lets check the other cards too".
 
#26 ·
Not surprising. Intel only allows splitting their primary PCIe link on Z-series chipsets and server chipsets, and AMD only allows it on the high-end A85X and A88X FM2 and FM2+ chipsets. While Zen is competing with X99 CPUs, its chipset is closer to the consumer platforms (LGA-115X and APUs rather than LGA-2011 and FX), so these are appropriate comparisons. It's a nice selling point for sure, and it's one reason I ended up with the Z97 board I have despite having a locked CPU: the chipset allows the x16 slot to run in x8/x8 mode. I'm not using it now but it was certainly nice when I was.

Quote:
Originally Posted by Code-Red View Post

I was under the impression B350 didn't support multi-GPU at all, thought that was old news. It's a plus if it supports Crossfire though.
Crossfire isn't too picky. I believe it can work with a second GPU in any slot, but I cannot confirm that. I know for a fact that a number of motherboards offering only one x16 slot and a single x4 slot will support it, stuff like your B150 and A68 chipsets. I don't know about x1 or x2 slots.

A lack of SLI support on the other hand...

Quote:
Originally Posted by FLCLimax View Post

Seems in line with NVIDIA's wish to eliminate SLI from the mainstream, hence their own mainstream GPU's not supporting SLI.
...can be blamed entirely on Nvidia. Nvidia requires an x8 link minimum per GPU. PLX switches are of course allowed, which is the only way 3-way and 4-way SLI (barring dual GPUs of course, but then again I think those have on-board PLX switches) on LGA-115X even functions. There is absolutely no reason for this either. PCIe 3.0 x4 does not support SLI, yet has just under twice the throughput of PCIe 1.1 x8, which does support it. It's completely arbitrary.
 
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