It meant active devices

Dale,
With such a pool I presume that your HCC badge is ready for future upper levels.
Congrats.

Just an old and slow machine, with a single core...

One dual-core and one quad-core. There have been a few others that lived out their retirement days crunching here.

Cheers

GHz is an interesting way to view it, but perhaps not the best as it does not accurately reflect the processing power of your CPU. For example a Pent. D 945 was clocked at 3.4GHz, but would not be as powerful as an Intel Core 2 duo clocked at 2.4GHz, becasue of the CPU architecture; there are more transistors on the IC2D and more operations types.
On about 6 devices (24 threads) I have about 60GHz of CPU power, but I only have one i7. My 60GHz includes lesser quads (Q6600, a Phenom II and a Q8400). Relative to your 245 from i7's it would be more like 40GHz.

Mind you, each one of my systems has at least one GPU; if not, it gets switched off!

Not sure what the CPU GFlops rating would be combined, but an i7-980X has a peak rating of 107.55 GFLOPS (wiki), so at a very rough guess it would total about 200 to 250GFlops CPU power.
I usually only crunch single precision GPU tasks, so although its not a fair comparison (designed to do different things) even my smallest cards (GT240s) are about 300GFlops peak and in total I have about 4000GFlops for my GPU's.
So, if it has no GPU, I'm not prepared to pay for the electric, especially in the summer!