I have followed this article http://www.guru3d.com/article/overclocking-the-radeon-hd-4770/2 with regards to installing Rivatuner 2.24. I have copied the 4770 cfg file across. I do not get the little 'gfx card' and 'chip' symbol. It reports as 'No additional info' under the 'ATI Radeon HD 4770 / Generic pnp monitor' drop down. Is this compatible with Win7 - 64? I have seen this [Vista x64 (disabled driver signature checking required)] in the Rivatuner page. Is this relevant to win7 64? If so how do you do this? I have 2 Asus 4770's in crossfire.