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OK, 11%, but in theory its up to +50% MIPS, while some is compensated by Altivec.

x5040 is expected to more the double it (2 x cores, + 20% cloock per each core to 020)

and if ever released, kind of might justify its high price

The x1000 uses the PA6T 1.8Ghz dual core, rated about 8000 MIPS (2.2 DMIPS * 1800 Mhz * 2 cores)
The x5020 uses the P5020 2.0Ghz dual core, rated about 12000 MIPS (3.0 DMIPS * 2000 Mhz * 2 cores )
The x5040 uses the P5040 2.4Ghz quad core, would rate about 28000 MIPS (3.0 DMIPS * 2400 Mhz * 4 cores )