what??
what m.2 slot disables sata ports?
an m.2 MIGHT have both nvme and sata capabilities meaning youll use or the other
but an m.2 is not related to the sata ports or video bandwidth
unless you mean pcie bandwidth by that which any common cpu has plenty. especially amd.
The B450 has limited bandwidth, which means the M.2 implementation has to take its bandwidth from somewhere else. Most often, the M.2 slot uses the CPU's PCIe lane intended for SATA ports. Thus, installing an M.2 SSD disables the two SATA ports from the CPU. ASRock takes a different approach that makes more sense to me: Installing an M.2 SSD disables the
second full-length PCIe slot. As the use of M.2 SSDs is now more common than multiple video cards, it's a more reasonable approach. On B450 boards that have two M.2 slots, the second M.2 either disables a PCIe slot or another SATA port. The pie is limited, and you have to make choices when slicing it.
also you dont HAVE to buy another cpu to update
most X470 boards have funcionallity to bios flash with no cpu
and any new manufactured b450 will have support outta the box
and as I said before, if you buy it in a physical store, they'll usually just do it for you.
That's true if you can find a physical store that carries the board you want, and can also flash the BIOS if necessary. In my area, neither Best Buy nor Fry's can flash a BIOS. I've asked them. I have found one PC repair shop that can flash a BIOS, but they'll charge me $40. That significantly narrows the gap between a B450 board and a low-end X570 (e.g., MSI X570 Gaming Plus).
The only reasonably-priced B450 boards I can find at Best Buy or Fry's are the Asus ROG B450-F and the MSI Tomahawk. I refuse to pay for LED lights and "gaming aesthetics." I have confirmed with Asus that they're not yet shipping compatible B450-F. And too many people have had problems with the Tomahawk for me to consider taking the risk. The promised Max version may or may not solve those problems, but nobody can say when it will be available.
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X570 are just expensive and aside from pcie 4.0 theyre quite useless
Unfortunately there is some truth to that. But I can't wait the six months or more it will probably take before I can be sure of getting a B450 board with a stable BIOS that works out of the box. The X570 isn't a perfect solution. But other than buying a B450 with a discounted 2600X and just enjoying it (which I've considered-- it would save me significant money) the X570 is the option most likely to avoid needless frustration.