Of course! Just saying, for the record. Over the year+ I've been mining, this setup for my base machine has saved me much hassle, because the mining subsystem is separate and does it's own thing without affecting my everyday usage.
Some cards combined with some algos could make real harm to the system performance if used as main graphics adapter.
R9 270 is really graceful thought. Whatever algo I use the system performs perfect and mining performance decreases only very slightly.
I think more miners use the AMD chipsets though and only the higher price AMD chipsets have decent onboard graphics.
Not exactly. All the onboard AMD cards will not work with newest proprietary drivers and open drivers supporting both them and new cards are in the early stage of development. Higher priced AMD chipsets like 890FX/990FX don't have integrated graphics cards at all. FM2/FM2+ chipsets don't have onboard cards but you can use APU built-in card and it works well with the newest drivers combined with discrete GPU. It can also mine and the system performance looks unaffected. Of course you can't expect too much from your IGP.
So, if you must have a discrete GPU for serving your screen, but don't like to waste the slot and want to use it for mining - R9 270 seems to be a very good choice.