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yoo see,this link confirms that the PS3’s OS (operating system)is the linux,then let’s do some math about the PS3’s cell cpu=
8 SPUs=1 SPU for the XMB=7 SPUs
7 SPUs=6 for games=1 SPU
1 SPU=1 SPU for the OS (operating system)=0 SPUs
and don’t say that the XMB is the PS3’s OS,the PS3’s OS is the linux(as I mentioned above in the link),so there’s no free SPUs in the PS3’s cell cpu for backup,Right?