If by your RAC you are talking about cruching with BOINC on the Rosetta project, then you can only use your CPU. There is no current GPU support for that project.
Your RAC will become higher, since the formula they use to compute the RAC is based on a 2 week half life exponential decay formula. This means the take all your crunching you've done for RAC calculatioon but consider at an higher rate the one you did in the last 2 weeks.
I know that Chalie3.0 is also folding with Q6600 so you could look at his RAC numbers for that computer as a guideline of what you should achieve as RAC if your o/c is the same.
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