Free interactive tool that shows you how PCIe lanes work on motherboards (opens in new tab)

Some don’t already have a build.

AM4 has high end gaming CPUs available and there are not yet major limitations besides future upgrades.

AM4 parts probably makes the best value gaming build you can get right now.

If I needed a new build right now, it would most likely be AM4. Going for the latest gen would just be out of my price point, whereas AM4 still has plenty of good chips and motherboards out there.

A 16x PCIE 6.0 setup has more bandwidth than any dual channel DDR5 memory kit.

Depends on what you're doing. I'm pretty sure the bandwidth for inference isn't much.

Whether or not SLI remained viable for gaming, Broadcom was going to jack up the prices on PCIe switches to the enterprise-only range. That's the real reason why consumer motherboards don't have more GPU slots. Mainstream consumer CPU sockets never had a wealth of PCIe lanes, there was just a brief span of years where PCIe switches were cheap so high-end consumer boards could offer several x8 or x16 slots (sharing bandwidth in ways that make diagrams like these important).

In previous decades, non-mainstream CPU sockets were also more accessible to consumer budgets; first-gen Threadripper started at only 8 cores, so it was possible to pay extra for more memory channels and IO lanes without also buying an excess of CPU cores. But that had little to do with the popularity or viability of multi-GPU consumer systems.

>Even fast SSDs can get away with half of their lanes and you’ll never notice except in rare cases of sustained large file transfers

Sorta yes but kinda the other way around — you’ll mostly notice in short high burst of I/O. This is mostly the case for people who use them to run remote mounted VM.

Nowadays all nvme have a cache on board (ddr3 memory is common), which is how they manage to keep up with high speed. However once you exhaust the cache speeds drop dramatically.

But your point is valid that very few people actually notice a difference

For a lot of enthousiasts the problem genuinely is in the lane count.

For example, putting a cheap 2nd-hand dual 25G NIC in a DIY server is quite attractive. But those are using PCIe Gen3 - so unless you're giving it 8 lanes it is being bottlenecked.

Same on the storage side: that PCIe Gen4 x4 slot might technically have enough bandwidth for four SSDs in most storage applications, but the board doesn't support bifurcating it.

The total platform bandwidth is plenty, it just isn't available in the way I want to use it.

Sky's the limit. (Short of hiring a team of engineers to design and fab a one-off board, anyway).

I appreciate your advice. I use the machine for a variety of different tasks, and am looking to accommodate at least two high-end GPU's (1 for passthrough to virtual machines for running things like Solidworks), a number of SSD's, and as many PCIe expansion cards as possible. Many of the cards are older-gen, so could be consolidated to just a few modern lanes if I could find an external expander with sufficiently generous capacity. Here's a quick inventory of what's in the existing box:

- Mellanox Infiniband. For high-speed, low-latency networking... these days, probably replaceable with integrated NIC's, particularly if they come with RDMA.

- High-performance RAID. I've found dedicated cards offer better features, performance, capacity, resilience and reliability than any of the mobo-integrated garbage I've tried over the years. Things like BBU's/SuperCaps, seamless migration and capacity upgrades, out-of-band monitoring, etc. e.g. I've taken my existing mass storage array created on a modest ARC-1231ML 15+ years ago, through several newer generations to an ARC-1883, with many disk and capacity upgrades along the way, but it's still the same array without ever having had to reformat and restore from scratch. Incidentally I've been particularly happy with Areca's hardware, and they've even implemented some features I requested over the years (like the ability to hot-clone a replacement disk for one expected to fail soon then swap in the new one, without having to degrade the array and wait for a lengthy rebuild process that reduces your fault tolerance while hammering all member disks; as well as some other tweaks for better compatibility with tools like Hard Disk Sentinel). I notice they're finally starting to come out with controllers oriented to SSD's, like a PCI 5.0 product (https://www.areca.com.tw/products/nvme-1689-8N.html) for up to 8 x4 M.2 SSD's that boasts up to 60 GB/s, which is interesting (though the high-queue-depth random performance still doesn't match directly-plugged drives). I know software-RAID for the solid state stuff is also an option (as is just living without redundancy), but it's been convenient outsourcing the complexity.

- Slim, low-performance accessory GPU for more displays

- A few others this crowd would just laugh at me for (e.g. a PCI I/O card that includes a true parallel port, because nothing is more fun™ for hobbyist stuff and USB-based alternatives were found to have too much abstraction or latency; a SCSI adapter for an archaic piece of vintage hardware I'd love to keep installed permanently but there ain't space, and occasional one-off use stuff like a high-bandwidth digitizer).

The motherboard had 6 PCIe slots, and I've got two more provided by an external PCIe expander (after accounting for the one lost for it's own connection). If I could find some kind of expander that took a single PCIe 5.0 slot and turned it into half a dozen PCIe 3.0 slots (some full-width) I'd be set.

I know I'm at the crazy end of how-much-crap-can-you-jam-in-one-PC, but it still seems bizarre to me that newer boards have so many fewer slots yet feel lane-constrained, when between leading-edge SSD's and high-bandwidth GPU's the demand for more lanes is skyrocketing. When I built the previous PC it felt tight but doable... these days it feels like I can barely accommodate the level of graphics and storage I'd like, and by the time I do, there's nothing left for anything else. Granted it's been a few years since I got my hands dirty with this stuff, so maybe I'm just doing it wrong?

And yes, I've heard of USB... and have a bazillion devices plugged in (including some of exotic ones like an LCD display, logic analyzer, and a legit floppy drive that does get used once in a blue moon like when I need to make a memtest86 boot disk for a vintage PC). I've actually found some motherboards have issues where the USB stack gets flakey once you have too many devices connected (even using powered hubs to mitigate power constraints).

Ok... go ahead and have at me; tell me I'm old and dusty and I should take my one GPU and one SSD and be happy with them ;-).

Now we're talking - thanks!

(ps. I don't suppose they make a "supersized" version of that board with a gap beside the first one or two GPU slots? So you can install a couple double-width cards without losing the underlying slots? Or a good source for a single-width, high-end GPU like the Inno3D RTX 5090 iChill Frostbite Pro?)