Low CPU PPD - is this normal?

[ET3D]

I've been doing GPU folding on my severely underclocked Radeon 5850 for a while. I get around 4000 PPD that way (with the new client). In anticipation of getting the Phenom X6 I decided to start folding on my Phenom X3, so I added a 2 core SMP slot.

The first unit I got was an A3 one, which took over a day, never gave me a PPD estimate, but looking at the extremeoverclocking table it gave me 481 points. Now I got an A4 unit and its PPD estimate is around 400.

Is this normal? At 10th the points I'm getting from the GPU it's pretty much not worth doing. How would this scale to the X6 (3 times as many cores folding, higher clock)? If it's linear then it will still be very low. Or are the bonus points what makes the difference?

Edit: I did some research, and it looks like points don't scale linearly, and that bonus points are where it's at. Found this bonus points calculator and it says that with bonus points I can expect over 1100 PPD instead of 400 on the A4 unit. Should be a lot better with the Phenom X6. I guess I'll just have to plough through until I qualify for bonus points.