I read the install guides over on the support forum, and got the impression that you should run driver 327 for max PPD, and the newer drivers resulted in a substantial performance hit. But reading some other threads, and a quick look through the reddit posts, seems to suggest there is a much bigger problem than just duff drivers. If I've got it right, then..... 1. Maxwell GPU's take a large performance hit running core17 with drivers newer than 327. 2. Maxwell GPU's either struggle to run and/or are being restricted from running Core18. 3. With no Core17 Wu's to assign, Maxwell are assigned Core15 with no QRB. 4. Core18 compatibility depends on GPU core revision. i.e GM107 for GTX750, or GM204 for GTX970. GM107 appears to run core18 successfully, although I dont know about the level of performance. Does this sound about right?