Out of curiosity...
How fast is the PowerMac G5 Quad Core?
http://www.everymac.com/systems/apple/powermac_g5/specs/powermac_g5_quad_2.5.html
I mean I read the specs and it looks like it is still a beast, at least for me (Up to 16 GB of RAM OMG


).
However since it is a 2005-06 technology, and since I bet some here still have one, I wonder how fast is it, and compared to what
First, the quad is the best Mac PPC available and I find that it is pretty reliable. Mine seems to have a problem with the CPU A, but I think it's time to clean it as I don't see any leak. Anyway, I'm looking for a case to restore it and possibly changing the LCS to a newer one (I must read on that to know if a LCS can work with ANY motherboard, etc, without to much tweaks).
For the performances, I'll compare my quad with my Late-2009 MacBook Pro. My G5 scored at 3488/3703 in Geekbench while my MBP scored at 3605 (64-bit). Those results seem to represent the reality. Although the G5 has 4 cores instead of 2 and an higher clock speed, for several things, my MBP will be faster. When it come to en/decoding newer format (like H.264), the G5 works a lot and my MBP is way faster. Well, I still can decode 1080p H.264 videos, but it takes way more CPU than on my MBP.
As I'm a developer, I prefer the G5 as a dev. environment for few things. First, Leopard is pretty fast on it in comparison to Mountain Lion. Second, when building, GCC split the works on the four cores, so it's pretty fast. Also, my G5 has two SATA-III HDD in RAID-0, but the controller is limited to SATA-I and I think the RAID-0 doesn't change much about the overall speed. Anyway, ~150 MB/s is fine for me.
For the memory, well, I mainly use memory for virtual machines. As sadly there is no applications for running virtual PPC machines, but only emulators, I don't use a lot of RAM. I do have 8 GB, but I would clearly be fine with ~4 GB while on my MBP, a good 16 GB would be nice.
You still have the limitation of PPC systems, but yes. The G5 is still pretty fast and still a beast which *could* compete with modern computers if there was a bigger support of the architecture. If you can fine a Linux distro with almost every package (I haven't used enough Debian to say anything about it's PPC port), it would be a beast for bunch of years.
Brief.
For encoding music with XLD : G5 > MBP
For encoding video in H.264 : G5 < MBP
For decoding video in H.264 : G5 < MBP
For compiling sources : G5 > MBP
For boot-time, etc : G5 > MBP
For HDD access : G5 > MBP (mostly due to the RAID-0, but a SSD in the MBP would change the result)
Well, in general the G5 is still a better machine, but I need new apps, so I can use it as a main machine.