this post was submitted on 14 Dec 2025
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Phoenix2 APUs like the R3 8300G and R5 8500G are the worst offenders in the 'cutting PCIe lanes' department.
The R5 8500G only has 14 lanes, for example. The FX-8350 and 8370 from a decade earlier, would've had 32 lanes available on the 990FX chipset, and half that on the 990X and 970 chipsets per contemporary reviews from when those CPUs were new, but they were all PCIe 2 as AM3+ was a PCIe 2 platform.
This is the specific review I'm going off of for this. FX-8350 review
Per that review, 990FX would've supported 2 x16 or 4 x8 slots, while 990X would've supported 2 x8 slots, and 970 would've only supported a single x16 slot, but of course configs varied by the board makers, and there would've been nothing stopping someone from making a 990FX board with a single x16 slot, three x4 slots, and two x2 slots, for example, nor a 990X board with a single x16 slot or a 970 board with a single x8 slot and two x4 slots.