Hello,
I have aheadless ubuntu 14.04 server with an haswell i3 CPU.
I wish to use (only) the Intel GPU for BOINC.

Is this possible?

If yes:
Which OpenCl driverpackage is recommended?

thanks for your answers

Two things:

1. To be able to use the GPU, and it being detected as a GPGPU, under most operating systems the VGA outlet or DVI outlet on the videochip or motherboard requires a VGA or DVI plug. This usually comes with a monitor attached, but since you want to use it headless, that won't work.

It is possible to make the system think that there is a monitor attached, by using a VGA dummy plug.

2. However, since you're using a Linux derivate, it's doubtful that you will find any OpenCL drivers that will enable the Intel GPU. Intel has thus far only released OpenCL capable drivers for the CPU, not yet for the GPU.

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THX for your reply.

Yes a dummy plug will be necessary, but this isn't a problem.
have some here already (mined bitcoin in the past).

tried out "beignet" on my machine but I failed with various dependency errors.
and it seems it needs a running xorg server.