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Hi there, may I ask what you will be doing with the machines? Anything graphics intensive or can make use of GPGPU power?
If not and you just need a cheap display card, then the suggestions above are great. I would personally suggest this HD 5450: it costs £38, can output to up to three screens (so long as one is via the displayport adapter), uses passive cooling so it's silent and is uses hardly any power.
I really don't think it does.