Creative Annhilator MX

[Dundain]

Does anyone know what the memory is rated at? The memory is DDR and right now is running at 143mhz. The Core is at 175. Also, the card didnt come with any heatsink/fan but Ive had no problems. I want to overclock it, but what heatsink/fan combo should I put on? I have a heatsink from an old Pentium system, thats fairly big and could actually probably cover both chip/ram at the same time. Would that work? And what would be a good interface material?