Hello good LevelOneTechers,
I’m looking for recommendation on a board for a Ryzen 9 3900X, using 4 x 16Gb (64 Gb) of ram. The board needs to have 3 physical pci-e 16x, one for the graphics, another for a Mellanox 40GB network card (pci-e 8x), and another for a future VM dedicated graphics card, hence I need a board with a good management of the IOMMU groups.
From I’ve read already over the internets, it seems that x570 may not be the best choice to use 4 dimms since they use a Daisy Chain wiring topology. However in a recent video, @wendell on the EposVox channel mentions that they achieved 3200Mhz on a 3900X using a X570, if I’m not mistaken.
PS: If possible all this using a board not as expensive as the cpu
Although during my research I was being move towards X470 Taichi, after this video : https://youtu.be/UtEmvoPS4WE?t=335 where @wendell explains the IOMMU groups attribution differences between X470 and X570, and after view this review ( https://www.tomshardware.com/reviews/asrock-x570-taichi-amd-ryzen-3000-am4-atx-motherboard,6217-2.html where a Daisi-Chain motherboard, in this case, AORUS x570 has better 4 dimms performance than a T topology motherboard like the Taichi X570) I realized that probably I’m better suited with a lower grade X570 (I mean… sub 300€ ) than with a good X470, now the journey continuous.
–UPDATE ON Memory Topology (daisy-chain vs t topology)
TL/DR: on Ryzen 3000 shouldn’t be a problem and the impact should be minimal…
Buildzoid explanation on daisy-chain: