Kind of why I jumped to AMD was to carry on with Crossfire thinking they may keep it going building GPU's also, B350 couldn't compete with x58 with the same cards and driver because of the x8 by x8 setup, times have changed with cards like the...
Silver has moved to $28oz now and holding, how long can they hold it back is the real question as a much needed raw material for everything, and why they need it to always stay cheap unlike Gold, it is part of the wheel that makes it roll.
I thought this was interesting pickup of information, as I have said before that AMD can run Rebar in PCIe 3 with an Intel Arc GPU, he is using B450 chipset with Ryzen 5 5600x and A770, his goal was to beat the PS5 at $500 budget...
The one piece of technology that AMD could be proud of is no SLi or CX ribbon was needed, and it worked even on RX 570/580.
If the CX driver still exist, what would 5800x 3D look like?
I use to CX with many different setup's, here are the same RX 570 8Gb and 4Gb on a B350 board being handled by my Ryzen 5 3600 in July 2019, http://www.3dmark.com/fs/19974916
The only true board I ever owned that would do what your asking is X58 Evga 3way Sli 758e, I lucked up buying late and got the board that made the Xeon 5660x a drop in without the mod, 1.2v board.
Slot 1 and 2 was full x16,slot 3 was x8, I could...
Today the AM5 system was updated with a new B650 chipset and Radeon 24.3.1 driver, windows is patched and bring up the rear is my RX6600 on the new driver with only the power moved to 120watt.
http://www.3dmark.com/fs/31629764 Firestrike was...
My MSI x470 Gaming Plus is X Fire and will surport the 5800x 3D
2 x PCIe 3.0 x16 slots (PCIE_1, PCIE_4)
1st, 2nd and 3rd Gen AMD® Ryzen™ processors support x16/x0, x8/x8 mode
Ryzen™ with Radeon™ Vega Graphics and 2nd Gen AMD® Ryzen™ with...
Great mix of gaming performance and core count. $410 $401.07 $388.99 $406.02 $391.49
https://www.amazon.com/AMD-RyzenTM-7900X3D-24-Thread-Processor/dp/B0BTRRNK7T/
Best price on A770 is.
ASRock Challenger Arc A770 16GB = $279.99
https://www.newegg.com/asrock-arc-a770-a770-cl-16go/p/N82E16814930113
The drivers are way better now, and I get to use FSR 3 and Frame Gen, I have the Sparkle Titan A770.