To be perfectly honest, in a real world situation probably nothing, according to those specs you linked to..
The most significant difference I see is the memory speed potential with the performance model. Maybe it has a different memory controller/northbridge in more ways than just the GMA950 video device, which is reported to be moderately better than the X3000, though neither is earth-shattering.
If you were to have to choose one, I personally would disregard the 'performance/mainstream' designation and go with whichever one suited me. NOTE that the performance designation might imply a slightly higher pricetag too.
If you really want to see differences, you would need to look into the Northbridge characteristics.
Last edited by GrapefruiTgirl; 10-03-2007 at 05:17 PM.
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