Ivy Bridge vs Hasell-E

ambam

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I read in the magazine Maximum PC that the Haswell-E has 45% more performance than the Haswell and Ivy-Bridge.

For gaming, would it be worth upgrading my Core i7 3770K to a 5770K or 5960X?
 
Solution
Since Ivy, every Z-series platform has PCI-e 3.0 anyway.

Clock for clock Hasswell-E is less than 5 percent faster in GAMING, the only benefit it has is more CACHE, which very rarely does anything for gaming performance

ambam

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When comparing quad core gaming performance, clock for clock, how much faster is the Haswell-E compared to the Haswell and Ivy Bridge?

Is it necessary to have an enthusiast X99 motherboard/Haswell-E CPU and PCIe 3.0 x16 slots to run the latest top-tier GPU's from AMD and Nvidia without bottlenecking due to PCI bus bandwidth limitations?
 

ambam

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I have a Z77/Ivy Bridge setup and I'm looking to upgrade to a dual SLI GTX 970. Will my two PCIe 3.0 x8 slots bottleneck two GTX 970 Maxwells in SLI?