Yeah, that is old school with only 240W on the +12V. How old is it? It certainly don't think it would be using long-life high quality capacitors, so due to capacitor aging, it probably can't reach that 240W (if it ever could).
It is certainly not enough to power your new system in any case. Since you got a k processor I take it you intend to overclock. And you got a good midrange graphics card.
You would want to allow 140W for the CPU (overclocked), 170 for the graphics card, and < 100 for everything else. Conservatively that is 410W with everything maxed out at once. So look for a quality PSU with 450-500W on its 12V rails with two PCI-E cables. If you are thinking of SLI, go for a 650W unit with 4 PCI-E power cables