But wouldn't more Cache help on mobile too.?It got nothing to do with AMD. But everything to do with performance/watt and the 2:1 ratio for designs.
Remember, mobile chips. Not desktop chips.
Or are you suggesting that more Cache would consume more power. ?
Even if that were true, they could just add more to desktop chips. They don't have the same die as mobile chips, right.? So if you are designing a chip for mainstream desktop, there is no reason not to put more Cache. The HEDT platform chips are server based & so they have more Cache like server chips.
Also this reminds me that previous gen 4930K & 4960X differed solely on the amount of Cache they had. But the 4960X still wasn't much faster, if at all.