Upgrading from Ivy Bridge to Haswell or Haswell-E offers minimal performance gains, roughly 5% clock-for-clock, which are mostly noticeable only in benchmarks. Gaming performance is primarily GPU-bound, meaning a slightly overclocked i7 3770K can compete well with Haswell-E, especially at lower resolutions like 1080p. Many users suggest that dual GTX 980 setups are overkill for 1080p gaming, and a more cost-effective option would be dual GTX 970s. The discussion emphasizes that significant improvements in gaming performance are more likely to come from upgrading to higher resolutions rather than changing CPUs. Overall, waiting for future generations like Skylake may provide better value for those considering an upgrade.