Today, we see that most motherboards come with built-in adapters, sound ports and video ports. Ordinarily, these may seem as helping the budget-conscious person try to save on added peripherals. But for the advanced users, these are nuisances since they take up additional load as far as analyzing the whole system process to which the motherboard will take much of the load.
That is one reason that while motherboards have these added features, they are normally disabled. Except perhaps for the sound port, video and network adapters are better maximized using the separate plug and play cards. They will mean additional cost for some but the fact of the matter is that if you want a fast PC, you just have to spend for it.
The performance level of your video card for example is different if you use the external slot placed video cards today. Other than providing better resolution, they take a load off the system resources needed to make a motherboard function properly. For gamers, it is advisable to use this extended video cards for better rendering of graphics since the requirement today is certainly higher. Why else do you think high-end graphics card are spread over the market today?
So if you want to save, you can do so but not crossing out the external devices. Be wiser when you have your PC assembled. It may be a cost-conscious consumer world out there but it you demand high performance from your PC, you simply cannot do it by making do without the standard setup we know of today.