> LGA1155: Major change to integrated GPU, also fixed the weird pin assignment of LGA1156 which made board layout a major pain.
Of course, the P67 chipset was trivially electrically compatible with LGA1156 CPUs; Asrock's P67 Transformer motherboard proved that conclusively.
That said, the main problem with 1155 was their locking down the clock dividers, so the BCLK overclocking you could do with 1156 platforms was completely removed (even though every chip in the Sandy Bridge lineup could do 4.4GHz without any problem). This was the beginning of the "we're intentionally limiting our processor performance due to zero competition" days.
> LGA1150: Introduction of on-die voltage regulation (FIVR)
Which they would proceed to remove from the die in later generations, if I recall correctly. (And yes, Haswell was a generation with ~0% IPC uplift so no big loss there, but still.)
> P67 chipset was trivially electrically compatible with LGA1156 CPUs
Well it’s possible to shoehorn in support for the determined but iGPU support is definitely out of reach and I am not sure what segment of the market is that targeted to. Seems like an excuse for AsRock to get rid of their excess stock. The socket change was actually very well received by everybody in the industry.
> Haswell was a generation with ~0% IPC uplift so no big loss there
You are right that FIVR did not last long in that particular iteration. However Haswell does have a 10% to 30% IPC advantage over the previous gen depending on the test[1].
Haswell also added AVX2 instructions which means that it will still run the latest games whereas anything older is up to the whims of the developer (and sometimes denuvo, sadly)
Of course, the P67 chipset was trivially electrically compatible with LGA1156 CPUs; Asrock's P67 Transformer motherboard proved that conclusively.
That said, the main problem with 1155 was their locking down the clock dividers, so the BCLK overclocking you could do with 1156 platforms was completely removed (even though every chip in the Sandy Bridge lineup could do 4.4GHz without any problem). This was the beginning of the "we're intentionally limiting our processor performance due to zero competition" days.
> LGA1150: Introduction of on-die voltage regulation (FIVR)
Which they would proceed to remove from the die in later generations, if I recall correctly. (And yes, Haswell was a generation with ~0% IPC uplift so no big loss there, but still.)