7950X3D has only 28 lanes compared to the 48 lanes I have now, will it be a problem?

[hobib_ali]

At the moment I have an i9 10940X LGA2066 on a X299 motherboard, I got this as it has 48 PCIe lanes

Ive been looking at a 7950X3D but today I discovered it only has 28 PCIe lanes

At the moment I have a RTX 4090 installed, this uses 16 lanes

I also have a creative ZXR sound card installed on a PCie slot, needed because of the 600ohm amp for my headphones, and a Wifi 6 wireless AX PCIe adaptor so it connects to my AX router, this takes up 8 and 8 lanes

I then have 4 10tb 7200rpm drives for storage and 3 M.2s/SSD's for games and apps

Not to mention 8 fully used USBs from the motherboard (peripherals)

So if I purchase the 7950X3D will I face issues with my set up, like will I have to sacrifice some of the PCIe components ect to get it working fully? because of the lack of lanes on the 79503DX


Eventually I have plans to remove the 4x10TB drives in a synology or Qnap and hook it up to my router for network storage
Get rid of my ZXR sound card and replace with a desktop headphone amp
Get rid of the PCIe AX wifi adaptor and use a ethernet cable

But until then I'm thinking a direct CPU to the AM5 chipset 79503DX and DDR5 ram along with a new motherboard may not work with my current set up?

 

[hobib_ali]

Do you mean, these take up an 8 lane slot in your current motherboard?

Since, I'm pretty sure these would be 1 lane each, not 8.

Im going off the motherboard manual, as both of the components are in a x8 slot so I assume it will use the 8 lanes, no?

 

[hobib_ali]

Yes it has 28 PCI-e lanes from the CPU but only 24 are user available, the other 4 are for the downstream from the CPU to the chipset and cant be used for anything else, bear in mind these are PCI-e 5.0 lanes.

So if you get the right board you will have a PCI-e 5.0 x16 slot for the GPU and 2 x PCI-e 5.0 x4 slots for 2 of the M.2 slots, if it has 2 PCI-e x16 slots and you plug anything into the 2nd slot, both slots will get dropped to x8x8, but thats the same with any board, thats your 24 lanes gone.

Surely your WiFi card and Soundcard are x1 devices not x8 devices ?, most boards have WiFi 6e on them now a days, so you could probably loose the WiFi card and plug the soundcard in to the very bottom slot without loosing anything.

Everything else runs off the chipset, which provides a shed load more PCI-e lanes (cant remember how many but its about 20) except they are PCI-e 4.0 lanes, for the x1 slots, 3rd and 4th (if available) nvme slots, SATA etc.

USB etc have their own controllers

This would probably have everything you need, you would just have to put the soundcard in the bottom slot and use the onboard WiFi https://www.overclockers.co.uk/asus...ocket-am5-ddr5-atx-motherboard-mb-6jw-as.html

boss, why is there 2 motherboards for the AM5/ 7950X3D CPU

you have X670 and a B650 choice to choose from, thats actually confusing as now people have to decide which motherboard version to choose from with their 7950X3D

• am5 (x670) ryzen 7000 series (23) ?
• am5 (a620/b650) ryzen 7000 series ?

also example the below motherboard, its pcie slot layout is actually quite thoughtful, as soon as you install a 4090 on some of these boards it eats up all the pcie slots unless you have a 2 slot blower style card which doesnt exist for the 4090 cards

this motherboard has it designed nicely, as soon as you install a 4090 you still have 2 pcie slots available, but a lot of the boards have a layout which means a 4090 will cover the remaining pcie slot

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