Intel has no less than seven different configurations for its Ivy Bridge processors, of which what is known as the 4+2 and 4+1 models, will be part of the initial launch. A 4+2 is a quad core CPU with a GT2 graphics core and a 4+1 is as such a quad core CPU with a GT1 graphics core. However, to create a 4+1 model, Intel has two different options, it can either make a specific chip or it can "harvest" a slightly failed 4+2 part and turn it into a 4+1 part. In this case Intel has the option to use models with both damaged GPU cores and damages cache, as the 4+1 models in general has less cache than the 4+2 models. As an example, something like a failed Core i7-3770 could be turned into a Core i5-3570 by disabling half of the GPU execution units and 0.5MB of cache per CPU core.
Things get a little bit more complex when we're moving on to the dual core models, as here we have 2+2 and 2+1 models, but these can either be made as intended, or once again "harvested". In the case of the 2+2 model it could only come from a 4+2 model, but the 2+1 models can be from a 4+2, 4+1 or a 2+2 depending on demand. Intel's internal marker for the "harvested" models appears to be a capital F, as in 4+1F or 2+1F.
Intel Ivy Bridge repurposing explained
Posted on Thursday, April 05 2012 @ 21:27 CEST by Thomas De Maesschalck