Same use of Lightroom and I just go for the i5 3.5 GHz/Radeon 575/512 SSD.
+5 or 10% in perfs means only few seconds less in Lightroom exports for example, the price and heat/noise differences does not justify these few seconds less for me 🙂
And I'm pretty sure that ,for Lightroom usage, internal SSD will mean more confort in real use than i7 or i5/Radeon 580 (Lightroom is not very optimised for multicores, more than 4 cores is useless, it only takes advantage from more Ghz and a dedicated graphic card)
+5 or 10% in perfs means only few seconds less in Lightroom exports for example, the price and heat/noise differences does not justify these few seconds less for me 🙂
And I'm pretty sure that ,for Lightroom usage, internal SSD will mean more confort in real use than i7 or i5/Radeon 580 (Lightroom is not very optimised for multicores, more than 4 cores is useless, it only takes advantage from more Ghz and a dedicated graphic card)