Yes you should be able to play it on high. I had a worse system than your current one and I played it on high. I only had a core 2 duo and an 9800gt. You should be fine.
How much RAM did you have? Was ddr2 or ddr3? Also what was your CPU Speed. Sorry im a noob im new to PC gaming.
I can run MX vs ATV Reflex maxed out @ 1080p on my flat screen tv very smooth, although after about 10 minits in a open map free ride it starts to become a little jumpy. Not really noticable. I think that may be my cpu though.