AMD B850 Mini ITX motherboard with PCIe slots on both sides teased ahead of Computex
Maxsun’s Terminator B850BKB WIFI has a PCIe x4 slot on the top and a x16 slot on the rear.

While agreement on a back connector standard appears to be in flux, and ‘BTF’ products remain thin on the ground, some interesting solutions leaning on a similar philosophy are being developed. A case in point is the Maxsun Terminator B850BKB WIFI, pictured today on ITHome (machine translation), with PCIe slots on both sides. The source says that Maxsun released the teaser images you see ahead of the AMD B850 chipset packing product’s Computex 2025 appearance.


From what we see, the new Terminator B850BKB WIFI bears little relation to previous BTF style designs. It shoves its PCIe 5.0 x16 slot, usually used for graphics cards, round the back. And it has one of its two M.2 SSD slots on the back, too. However, this doesn’t seem to have been done in the spirit of BTF – to enable an ultra-clean cable-managed build.
Instead, the upper side of the motherboard is still bristling with slots that are wiped from the face of other BTF designs we have seen. In other words, the oft-vanquished CPU power and motherboard power connectors, various front I/O, USB, SATA, and fan headers are all still present upper-deck on this design. It actually still has a PCIe slot on the top, too, a shorted PCIE x4 slot. The source reckons that this will be useful for low profile expansion cards. That’s pretty nice on such a compact Mini ITX form factor.
At the moment, all we know of the Maxsun Terminator B850BKB WIFI comes from the short translated blurb and these teased images. Rooting through the firm’s official product pages, we see only the next-size-up Terminator B850M WIFI, which doesn’t seem to feature any back-connector shenanigans.
Example PC builds would be appreciated
Seeing the new Terminator B850BKB WIFI in its planned environment, in a PC case we might be able to buy at retail, would have been more informative. Making the most from the potential that Mini ITX offers often involves very particular component compromises and creative thinking, so hopefully Maxsun will show how using this motherboard delivers advantages compared to its Mini ITX rivals.
Computex 2025 officially kicks off on Tuesday, running until Friday, so we hope that Maxsun explains this interesting new motherboard, and any other unusual treats it has in store, on the show floor. Stay tuned.
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Mark Tyson is a news editor at Tom's Hardware. He enjoys covering the full breadth of PC tech; from business and semiconductor design to products approaching the edge of reason.
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jlake3 You guys seem to really want to tie this to "BTF", which it is not and which the original source doesn't appear to mention AT ALL. It's just a ITX board made for a particular chassis, the "A4 ITX", which the source mentions but does not show.Reply
Can't think of any model names at the moment, but I feel like I've definitely seen cases where the GPU mounts behind the motherboard and there's a wraparound PCIe riser. Seems like this is an offshoot of that, but rather than relocating it to create two airflow zones they're putting everything in line so the case can be thinner. -
Notton I was wondering when someone would eventually do this.Reply
If you look at the orientation of the wifi antennae nubs, you'll see that the rear slot is at the top, which is perfect for a sandwich layout. This would reduce the need for a long riser cable and may help with signal integrity.
If you're ever wondering why PCIe 5.0 has signal integrity issues, AFAIK, it's the outdated (22yr old) connector.
Servers use long PCIe cables with a modern slim connector. -
Gillerer At least DAN Cases has a line of very compact ITX cases dubbed "A4". They're manufactured by Lian Li.Reply