Passmark / CPU mark for PowerPC CPUs?

I was wondering if there was any program with which one could compare performance between different PPCs and x86?

Currently I look at https://www.cpubenchmark.net/ when I'm getting a PC to see how fast it really is, since CPU model, GHz and number of cores has little to say.

My crap laptop at home (AMD C50) scores 460 passmark, my old work laptop (i5-something) scored 2800, my new work laptop (i7-4810MQ) scores 8500.

But where on this list does a G4/800 or PA6T/1.800 or ARM Cortex-A7 fit in?

Orders of magnitude, estimating that. Better try something with a semblance of accuracy?

"something with a semblance of accuracy"

Like what?

The PassMark seems like a fairly good indicator when buying a PC. But the program is probably written especially for x86 and would not compare even if it was ported to PPC I suppose.

We got memtester which is universal. It would be nice with a CPU tester (maybe just single-core) that could be made somewhat universal in ANSI-C ((un?)fortunately then not testing vector units).