Depends if you plan to go SLI, I've seen a few people asking if they could SLI two 970's on their 650w PSU's which you can, whereas with 290's most people would tell you not to.
Lower power has it's benefits, it's not just marketing crud as it usually leads to lower temps and higher overclocks as can be seen with these cards. I bet if nvidia hadn't focussed at all on power efficiency they wouldn't be hitting 1500mhz.
Lower power has it's benefits, it's not just marketing crud as it usually leads to lower temps and higher overclocks as can be seen with these cards. I bet if nvidia hadn't focussed at all on power efficiency they wouldn't be hitting 1500mhz.