No gaming motherboards comes with many pcie slots since they aren't build for mining but for gaming only, the highest you will find on gaming motherboards are 4-5pcie slots, few has two pcie x16 slots for crossfire and some don't
As mentioned in the original post, Z270f's (and several other Z170, Z97 etc before them) GAMING motherboards, that I was using come with 7 PCIe slots, and 2 m.2 slots that with adapters allowed use of 9 GPUs. I however was looking for more recent alternatives, since these are hard to find now. No point in typing out a response when you dont know the answer, is there?
True, is really important the CPU lanes, right now you can get a Atlhon 3000g but only have 6 lanes, you can use it only with 6 gpu with the 4g decode option, the only way to max it is using a pcie extender x1pcie to x4pcie for a total of 9 gpu. (some ppl say that found a way to use 2 extenders on 1 motherboard, not sure about that, i need 2 adapters to test that). Remember 1 to 4 pcie adapters are pci splitter, they dont add more lanes... in other words it divide the bandwidth of 1 lane to 4.
Umm the 3000G has 20 PCIe lanes, but 8 are reserved for the chipset (x450/470), 8 for the x16 slot and 4 for the m.2 slot. Technically you should be able to use 12 GPUs with the 3000G if you disable integrated graphics, but I'm yet to find an X470 motherboard that will work with a 1x4 splitter and go beyond 8 GPUs.
- Asrock B450 Steel Legend AMD : x6pcie (2x16slot + 4 x1slots) + 2m2 nvme slots
- MSI B450 Gaming Plus Max : x6pcie (2 x16slot & 4 x1) + 1 m2 nvme slot
Thank you, this is the answer I was looking for. We can add the Asus B450-F Gaming to the above list as well, since that too has 6 PCIe slots.
B450 chips however will only let you use one of the two m.2 slots while the 6 PCIe slots are populated, so that brings us to a total of 7 on these boards.
That appears to be the limit for now - 7 GPUs. Untill we switch to Intel and factor in 1x4 PCIe splitters.
, 8 with m.2 converter, and nowdays getting less pcies
