My response was very similar to that guy above's:
70 degrees? Man, mine's 30 right now and SOMETIMES it hits 45 under extreme load. Here's a couple pointers:
1) Make sure your CPU fan is working correctly, and if you can monitor the speed, make sure it's at least above 2000 RPM.
2) Install some case fans, if you have the room. Just make sure you get the ball bearing kind.
3) If necessary, buy a tube of thermal paste. Take off the CPU fan and heatsink, and spread a THIN, but COMPLETE later over the CPU. Then firmly lock the heatsink and fan into place.
4) If all else fails, you might want to start researching a new computer. 1.4 isn't bad, but if you want to run high-end games... it is.