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I have installed Ubuntu 12.04 on my PC, but without 2 AMD graphics card on PCIe. So I am using PC with Intel graphics card which is on board so far.

But I bought 2 AMD graphics card HD7970. But for computing purpose not for connecting and expanding monitors but really only for parallel computing. So it means that I want to stay on Intel gr, was that there is some xorg.conf and needs to be edited. But I think in my case it hasn't. Because I have no monitors to connect to this 2 AMD graphics card. Am I right? If there is answer to this question please direct me. If not I will be very gratefull for answer. And sorry for my english I am not the native speaker. Thank you in advance for any answer.

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i recommend you read this article. or How to Install AMD ATI Radeon Graphics HD 6770M on Ubuntu 13.04 64bit

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While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes. – Maythux Feb 8 '14 at 13:25

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