Details on AMD's Quirky Chipset Solutions for AM5

Re:Details on AMD's Quirky Chipset Solutions for AM5 by zamadatix on Sunday May 22, 2022 @06:47PM (#31473564)

The NVMe off that second slot in particular is what's going to be painful for that market segment. If it weren't the topology that was only used specifically for the high performance market segment I'd say it doesn't matter but I'd be willing to bet most in that segment would actually want that 2nd x4 lane direct to the 1st chipset like last gen, not to the a second chipset just so they can have even more built in USB and SATA ports.

But who knows, maybe "I have a great gaming PC, it's got 25 USB ports!" (yes, that's the actual number) is more marketable than actually tuning for performance.

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Re:Details on AMD's Quirky Chipset Solutions for AM5 by wtallis on Sunday May 22, 2022 @07:06PM (#31473693)

> The NVMe off that second slot in particular is what's going to be painful for that market segment.

Definitely not. Consumer Optane is dead, so the only devices that will get used in those slots have inherent latencies that are multiple orders of magnitude higher than those typical for a PCIe switch. The extra switch latency gets entirely lost in the noise, which I've observed on multiple occasions while reviewing "NVMe RAID" products.

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Re:Details on AMD's Quirky Chipset Solutions for AM5 by zamadatix on Sunday May 22, 2022 @08:32PM (#31474208)

It should be easily noticeable in benchmarks, after all a even 5% impact can still be called "multiple orders of magnitude" from being comparable to baseline. In double chain I'd be surprised if the impact was any less.

https://cdn.thefpsreview.com/wp-content/uploads/2021/09/crys...

Definitely not expecting end of the world numbers from it but at the same time I doubt many in the high end space are going to look at what that second chipset gives them and say "it's worth adding another PCIe switch in-between my addons for".

Of course you can just use the second x8 worth of bandwidth for drives but I'm not sure that sells having a chained chipset over just adding what you actually want to the first which would now have more open lanes anyways.

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