Evert said:
Hi!
If I were to get a graphics card with 1xanalogue & 1xDVI output, and
connect 2 identical analogue LCD screens (1 with DVI -> analogue
adapter), would I see any difference in the output to the screens?
Regards,
Evert
PS. The screens will probably be Samsung 710N. The graph card I haven't
decided on, but something high-end PCI-Express. The system a Shuttle
SB81P.
First you must be sure the DVI output is DVI-I so it is able to produce
an analog(ue) signal through that port. Otherwise the DVI to VGA cable
will not provide any signal to the second monitor.
Having accomplished THAT, I have to say any observable difference
will be "only to the extent of production dis-similarity in the monitors".
The reason is that both monitors are still being fed an analog(ue)
signal,
so each monitor has to use the PLL (Phase Locked Loop) in it's "scalar
chip" to recover the clock data. It is this process of clock recovery that
potentially introduces some noise artifacts in the monitor.
Note that even though the monitor models are identical, there ARE mfg
tolerances to deal with that can contribute some (typically small) amount of
difference between them. These may not be terribly obvious to a casual
observer. Also, FWIW, there is no known standard way to effect a
measurement of these artifacts.
If you really want a display without these kind of artifacts, you will
need
to get a monitor with a DVI input, and connect to the DVI output of a card
with a DVI to DVI cable (no analog(ue) signal - only a digital data stream).
Having said all that, SOME people will readily see the difference between
a "true DVI" connection vs. analog, and some will be hard pressed to see any
difference at all.
HTH
NGA
