Hi Phoebelou,
That machine will not run Extremes at graphical settings that you'll be happy with. It will run it, but it will be a slide show, or your graphics will need to be set so low that it will look terrible. I'm basing this on my own laptop, which is higher spec'd than what you're looking at (at least in the CPU and GPU departments). Specs as follows:
HP Pavilion dv6 (6135dx) Laptop
Quad-core AMD A8-3500M processor (While advertised to go up to 2.4GHz on 'turbo', I've never seen it exceed 1.5GHz.)
Win 7 Home Premium 64-bit
6GB Ram
640GB HDD
Radeon Dual Graphics (AMD Radeon HD 6620G (integrated into CPU, uses shared system RAM), and AMD Radeon HD 6750M with 1GB dedicated video RAM.)
Even enabling crossfire between the two GPU's made no noticeable difference for Extremes. In any case, I opted for picking up SS08CE for my laptop, (which I see you already have SS08), and SSE for my main pc that actually has the horsepower to run Extremes acceptably.
I hope this information is helpful, and best of luck!
-George