Frosty, they don't sell a motherboard to a single customer that wants only the features they use that's totally impossible, they sell to the masses, it HAS to be the masses your you'd pay 10 times the price becaues of production costs. You don't seem to understand the economy of scale. It's actually cheaper to produce boards with all this other crap on it rather than a dozen boards with various mixed peripherals for specific purposes.
You're actually paying signifcantly less money than you would be for a board that didn't have all the features you didn't want, simply because it's cheaper to make them in bulk under a giant umbrulla stamp that has the features that 99.9% of all users could possibly want. Catering to even a 1% market can sink an entire product line. What is unforgiving is that you think the world should fit your perception of it, it'd be far more forgiving of you to understand why things are the way they are now.
Do you really think these multi billion dollars companies haven't worked the numbers on all this stuff to try to maximize product price vs cost and do so on a daily basis?
Personally, I wish they would make a board that had -all- of those things (maybe they do - but its probably waaay out of my price range). Heck, I wish they still made a board with EISA slots (just a tad bit easier to prototype with - plus I have a ton of 8255 PIAs I need to do something with!). I know it is "just me" though; most people don't want or need a lot of that stuff, but I have a ton of legacy hardware that I want to keep supporting and using. That's generally why I keep a bunch of old motherboards around (still kicking myself for letting go of a sweet 386 mobo I had at one time)...
I'm not sure why you would want a blackplane system like blade servers use it's totally non practical for a PC system.
It would be incredibly difficult if not physically impossible to run processors or modern high speed memories on a backplane like that, modern chips are too fast the trace requirements are too strict, the simple addition of a physical connector slot would cause the devices to be limited in performance, why do you think the Intels lame slot based processors failed so utterly? A year after the first slot based motherboards came out the processors were already too fast to be run on them the trace parasitic of the physical connector crippled the processor.
Modern software BARELY even take advantage of dual core processors, there is no practical public use for a 60 core machine.
You definitely came up with a few possible uses for such a deisgn, not one of which can't be already done with existing boards. There are quad processor based boards that support quad cored intel hyperthreaded chips, for an effective possibility of 64 running threads, totally useless, especially if they need to access system memory as the whole thing comes to a screaming halt when an external bus needs to be used.
Personally I always buy the most state of the art (within reason) motherboard that I can, regardless of price, the top of the line motherboards are only a couple hundred dollars more, and my last machine was retired after 6 years and will still run every piece of software out there except modern games. Chosing the proper motherboard and looking at current and upcoming technologies and determining what is the best choice for the long term is incredibly complex. Personally it's not worth it nowdays modern PC's are so incredibly over powered right now it's nearly impossible to buy a slow computer, I bought a Dell system for my current machine simply because they've already done all the work for me.
...and this is what I was alluding to when I wrote "...while I can foresee that there could be certain issues with a backplane..."
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