Are there any free SPEs in the PS3's cell cpu?

PLEASE hear me:there's 7 SPEs and 1 PPU in the PS3's cell cpu,1 for the OS=6 SPEs=6 for games=0 SPEs and 1 PPU=1 PPU for the XMB=0 SPEs or PPU,then please tell me where's the free SPE or PPU?are there any free SPE or PPU in the PS3's cell cpu?
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