PCIE 5.0 8x Slot using HighPoint Technologies Rocket 1508

[SkyFox33]

Hello everyone!
I’m looking at new rig build and I have a PCIE question.
I’m looking at getting a EVGA Classified Z790 mobo and using a HighPoint Technologies Rocket 1508 in the second slot. Does the math of a 16x PCIE 4.0 is the same as 8x PCIE 5.0 or would I be bottlenecking the card?

[jode]

Any add-on card connects electrically up to the available lanes in the slot of mobo. That’s 8 lanes in your EVGA Classified Z790 mobo. Then, it negotiates how quick it can communicate on these lanes, the highest common denominator is (should be) chosen - in this case the PCIe 4.0 standard (16MT/lane).

In short, the Rocket 1508 can be expected to connect with 8 lanes using the PCIe 4 standard to the EVGA Classified Z790 mobo.

Sorry, your math checks out, but the physics doesn’t

[aBav.Normie-Pleb]

Yes, just to clarify it a bit: You would need an active PCIe Gen5 switch chipset on the Add-In Card that handles the SSDs as well as a PCIe Gen5-compatible platform for this to work, the former don’t seem to have hit the market yet.

So you’ll currently have to be satisfied with PCIe Gen4 x8 in your case, around 15.000 MB/s bidirectionally which is quite a bit even by today’s standards.