The speed bump from these "refreshed" processors would tend to appear more slight of hand than actual improvement. The thing with Sandy Bridge and processors with the "Turbo" modes is that the existing 2.7Ghz I have already can do 3.4Ghz in theory, and does 3-3.2Ghz quite easily. Pushing the base clock up to 2.8Ghz doesn't really change anything, and it will still do 3-3.2Ghz quite easily. If during actual use it performs the same as the current 2.7Ghz under the same thermal conditions and workload they don't really care, as it will still meet both its minimum clock requirement (2.8) and be able to briefly hit its peak of 3.5Ghz.
The quads will be the same, its the same chip as the one already in use, comes off the same production line, the only difference is that its configured for a base clock 100 or 200 higher, and a peak clock 100 or 200 higher, while the actual performance level which will be dictated not by the chip but by available cooling will end up identical to the old chip, since it still is the old chip, so the variable speeds it reaches, that are between the base and peak clock will most likely be the same.
