I really feel that the need for a dGPU is decreasing in HTPC applications (which are themselves a relative rarity amongst consumers given the numerous boxes you can hook up to a TV that handle media). Total power draw of a system with an iGPU will be comparable, and there are potential cost and form factor benefits. Even a 35W Bristol Ridge A12-9800E is worth a look, let alone some future APU based on Zen+Vega. There are also cases where having more CPU punch also comes in handy when decoding certain content, even with GPU offloading, or performing other tasks. But if you still need a fanless system with a fanless dGPU, utilizing a cheap LP Atom with a full-length slot: I believe that PCIe 2.0 x6 supplies enough bandwidth for an entry level card, should they supply most of it to said x16 slot.
https://www.techpowerup.com/reviews/NVIDIA/GTX_980_PCI-Express_Scaling/21.html
Look at the x4 2.0 results. Better than you anticipated, yes? On a 980 no less, and paired with an i7-4770K clocked at 4.2 GHz. I would imagine that setup certainly outclasses a less-demanding true entry-level fanless 1030 or 550/560 paired with a "Pentium Silver". Thus the impact would be lessened further.
Shame no DMI, but network etc would have a very small impact on available bandwidth. I would highly recommend they use native SATA for the SSD. For such a budget build where a more costly chip just isn't appropriate I again believe it will have very little impact in RW use.
bit_user :
Look, if you really believe it would add zero value to anyone I can accept that's what you think. But you're not about to change my mind that PCIe 3.0 and/or more lanes would help some. So, we should probably call it a draw.
I will agree that some will want it, and it's possible someone would really benefit, though that's probably an edge case. I agree it will have some impact that could be measured in a benchmark. I don't think it's worth fussing at Intel over. I'm not attempting to "win" anything. I do not care about that. If I valued that, I would never go against the Opinion of the Masses, knowing that I would be excoriated for daring to question Doctrine.
Anyway, I respect your opinion, even if I do not agree. If after reviewing the above benchmarks and commentary you still strongly feel this thing needs PCIe 3.0, then yes... agree to disagree.