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Yes, I meant consumer boards. ASRock Rack is server stuff afaik, I am not even sure where one can buy it and it is way out of my budget I guess.Yes, ASRock Rack X570D4U and X570D4U-2L2T.
There are also some TR4 and LGA2066 µATX mobos that support x16/x16 even.
Presumably because the target group for x8/x8 is ready to buy an ATX case.I don't understand why almost every uATX board supports only x16+x4
Wow, that is a nice motherboard. Thanks!The Prime Z590M-Plus does.
-EDIT-
Disregard, that was just the bifurcation support for slot 1 that was listed; its secondary x16 slot is also only x4 off the chipset.
-EDIT2-
Seems like the Z490M Gaming Edge does actually do it. MSI at least helpfuly indicates the presence of this feature on boards by having both x16 slots steel-cased.
Wow, that is a nice motherboard. Thanks!
I was wondering meanwhile, that maybe it is possible to enable this feature on all uATX boards if the lanes are connected to the CPU, because in theory the CPU does most of the work here and Ryzen support x8/x8. Ofc. if there is no physical connection, then it is impossible to do it. I'll investigate this later.
I did some calculations with mITX + bifurcation riser card, and it would be at least $200 cheaper if I could go with uATX and 2x8 with two slots. It is very annoying that all manufacturers make small size + 2x8 some sort of challange or server feature and either I buy a server grade bifurcation riser card with PCIE cables and a special case for an extra $200 or I buy an uATX server motherboard that is usually $200 more expensive, than a consumer grade one. I don't even know where to buy a server board in my country, most of them are sold to companies, not to consumers and there are not many server boards for AM4 if there is any, because it is a consumer CPU e.g. ECC is not validated in it. I might go with Intel s1200 or s1151 instead depending on my CPU needs. Those boards at least exist (e.g. MSI MPG Z490M GAMING EDGE WIFI or ASUS TUF Z390M-PRO GAMING). It is really bad that this feature could be easily supported by manufacturers, but they don't care or they intentionally don't implement them.I went thru this search awhile ago trying to build a dual-GPU AM4 system in a uATX case and came up empty. All the boards I found had the second full-length PCIe slot coming off the Chipset, even the higher-end X470/570 ones. Some ASRock boards even have an option for bifurcation in the BIOS but it's only for splitting the top slot (with a riser I guess?) uATX mGPU setups are a niche within a niche and it's easier to connect the second slot to the chipset I guess, plus that arraignment can be better in situations where the second slot is occupied with something that's not bandwidth-sensitive because the GPU still gets its full 16 lanes.