At 1280x1024 75Hz 32bpp the ram is being subjected to 400meg/second. Ram is pretty fast these days but this would have to equate to
at least a few percent.
Not necessarily... only if the bus was so saturated that it delayed the
other data. Typically, the bus is not so saturated. If you had a 4 lane
highway, having 2 cars already on it will not necessarily slow down a 3rd
car.
It doesn't really lower the cost of the system that much, all you save is buying a vga card. For an extra few dollars you also get
more pci slots, more memory slots, more features such as extra USB ports, a better quality board, a faster chipset, faster video, a
faster system and more ram.
True, it is not a large cost difference, but then for someone considering
such a low-to-mid range system, it may easily be a signficant percentage
of total cost. Some people have no need for more PCI slots if a board
already has sound, network adapter, video.
It is not necessarily true that a board with integrated video has
drawbacks of too few USB ports (almost all have 4-6 including the
front-port pin header, how many do you really need?).
It can't be assumed a board with integrated video is better quality. If
you buy a low-end brand it could be, but so would that brand's offerings
without the integrated video.
It is not true that the chipset is faster, except in isolated instances.
For the most part the chipset is also offered in a non-integrated-video
version. On the contrary, the fastest integrated video is nForce2, which
is still the fastest Athlon chipset.
More ram? Who cares? If the integrated video uses 64MB, which is worth
about $9 worth of memory. You're saving $40 for a video card so if memory
is the issue then you can put that $40 towards 256MB more. In many
instances, a low-end box would benefit more from the 256MB than a seperate
video card, UNLESS the user wants good 3D gaming.
Integrated video also allows a much smaller system case. yesteryear's
pizza box cases look large compared to some of today's boxes. It might
not be suitable as primary system for a power user, but certainly a good
alternative for a file server or internet kiosk, office machine, etc.
Problem is that you have to get a faster cpu just to keep the same speed. Generally the difference in price is about the same as a
vga card.
You're making a lot of assumptions that are, as I mentioned previously,
only based on certain types of benchmarks. Besides particularly demanding
uses, like gaming or video editing, name a task that's common, that will
be slowed down enough to be noticable? I'm not claiming there aren't any,
but that for most uses, even a die-hard power user will not be able to
notice a performance difference in most 2D tasks.
If someone knows they have a particularly demanding task, then of course
they will plan accordingly, whether it be a good video card or memory or
something else, but at a certain point the budget is best spent on only
what matters to that particular user, not what you feel everyone should
have.
Your claim about "faster CPU just to keep same speed" is not true except
in very isolated instances. If we wanted to nitpick, it would be a wasted
to pay for a video card if the user didn't game and didn't already have a
pair of RAIDed Raptors, but again the budget has to stop somewhere if it's
not a no-expense-spared build.
Ultimate performance is not everything though. There is no point to
paying more for performance that isn't needed. Your previous example of a
P4 2.8GHz, would not be my idea of a good example, that a box built for
low cost would certainly not have a P4 2.8 in it, and that is exactly why
some choose integrated video, for the cost reduction. If they already
favor cost over utmost performance, then there's no point in aruging to
spend a bit more, since just about any system could be faster for a few
dollars more, then a few dollars more, then a few dollars more. It's all
a matter of what the budget is and how that budget best applies to the
user's needs, and for some that means integrated video.