X870 or X670?

[edgedemon]

If you look at Anandtech's launch article here, they have the block diagrams for X670/X670E/B650/B650E which shows you where the USB ports come from relative to the CPU and the chipset.

Generally speaking, if there are no exclusions/sharing listed in the manual then you're usually fine. Chipset connected stuff does share one narrow uplink to the CPU, but realistically you're not going to notice.

Based on the diagram for B650, I think Im alright for PCIe lanes then.
Im going to go for X870 as the following excerpt from Anandtech states for X670

And while this configuration adds more I/O lanes (and thus more I/O bandwidth), it should be noted that all of these I/O lanes are still gated behind the PCIe 4.0 x4 connection going back to the CPU. So the amount of backhaul bandwidth available between the chipsets and the CPU is not any higher than it is on B650. The name of the game here is flexibility; AMD is not designing this platform for lots of sustained, high-speed I/O outside of the CPU-connected x16 PCIe graphics slot and M.2 slots. Rather, it’s designed to have a lot of peripherals attached that are either low bandwidth, or only periodically need high bandwidths.

in addition if AM5 is going through to 2027 and (if) there is one more gen CPU release then I have a better chance of getting X870 updated for next gen then X670 if they want to be really ***p about it

Only real worthwhile differences between X670 and X870 is more USB4 and Wifi7, Under the hood it's the same chipset.

I don't think it is, X670 is 2 x B650 chipsets as it has 2 x Prom21 chips as opposed to 1 on B650 and X870.

 

[Tetras]

I don't think it is, X670 is 2 x B650 chipsets as it has 2 x Prom21 chips as opposed to 1 on B650 and X870.

I think we're having that E versus non-E issue again there.

X670E and X870E appear to be the same. X870 is B650E. X670 is X670E without the PCI-E graphics.

I don't know why AMD made the decision to remove the E version of the B board and downgrade the X670 equivalent, seems a bit silly, but they apparently consider PCI-E 5.0 graphics to be a premium feature more than the PCI-E lanes.

Im going to go for X870 as the following excerpt from Anandtech states for X670

And while this configuration adds more I/O lanes (and thus more I/O bandwidth), it should be noted that all of these I/O lanes are still gated behind the PCIe 4.0 x4 connection going back to the CPU. So the amount of backhaul bandwidth available between the chipsets and the CPU is not any higher than it is on B650. The name of the game here is flexibility; AMD is not designing this platform for lots of sustained, high-speed I/O outside of the CPU-connected x16 PCIe graphics slot and M.2 slots. Rather, it’s designed to have a lot of peripherals attached that are either low bandwidth, or only periodically need high bandwidths.

That's not an issue for most users, because they're not normally exceeding the uplink bandwidth. If you run out of lanes on B650E/X670 and end up stealing the GPU lanes that is more likely to be a problem, hence if someone wants 4x M.2 slots it is prudent to get X670 or X670E (or X870E).

 

[Varys]

Just get a new case and ATX, no? Small boards are so gimped they're not worth having

 

[edgedemon]

I think we're having that E versus non-E issue again there.

X670E and X870E appear to be the same. X870 is B650E. X670 is X670E without the PCI-E graphics.

I don't know why AMD made the decision to remove the E version of the B board and downgrade the X670 equivalent, seems a bit silly, but they apparently consider PCI-E 5.0 graphics to be a premium feature more than the PCI-E lanes.


That's not an issue for most users, because they're not normally exceeding the uplink bandwidth. If you run out of lanes on B650E/X670 and end up stealing the GPU lanes that is more likely to be a problem, hence if someone wants 4x M.2 slots it is prudent to get X670 or X670E (or X870E).

Quite possibly My understanding from everything I have read is that X670E has 2 Prom21 chips in serial for additional PCI-e lanes for peripherals as well as the extra lanes for the GFX. Agree X870 is B650E. Just the 2 M.2 drives so I will be OK, 1 x Gen4 and 1 x Gen5.

Just get a new case and ATX, no? Small boards are so gimped they're not worth having

I have had a full tower since 2011, now my ex gaming room is now an office for both of us, I want something tiny as I really need the space. Otherwise I completely agree. Mini ITX is small enough for me to have on the spare space on my monitor stand.