Hi There, i have a power mac g5, which has the following spec, can i upgrade straight from 10.5.8 to 10.7? or do i have to purchase 10.6 first?;

Hardware Overview:
  Model Name:          Power Mac G5
  Model Identifier:          PowerMac7,3
  Processor Name:          PowerPC G5  (3.1)
  Processor Speed:          2.7 GHz
  Number Of CPUs:          2
  L2 Cache (per CPU):          512 KB
  Memory:          4 GB
  Bus Speed:          1.35 GHz
  Boot ROM Version:          5.2.4f1
  Hardware UUID:          00000000-0000-1000-8000-000D9379499E

Lion won't boot or install if there isn't EFI or UEFI firmware.
You can focus on Intel side because that is simple and easier (though because some early "Core Duo" models are cut off from 10.7 and only Core2Duo and above are supported).
There is no firmware support. The logicboard can't.  There is no PowerPC code in Lion, which was the heart of the G5 kernel.
Lion integrates the iPad and other iOS devices with the desktop and iCloud along with Apple's AppStore.   There is a lot of 'something' and what value or benefit it offers to the traditional desktop OS, I think the jury will have to decide. 
But 10.4.11 may also be the most optimized Apple OS for the PowerMac platform.
Excellent value on Apple refurbished equipment -
Apple Special Mac Pro
Apple Specials MacBook Pro
Apple Specials iMac

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