I can't believe people are having trouble with msi cards and hynix memory! First of all, with the 4gb hynix cards use the 1500memstraps! Second, lower the gpu speed (1095-1191mhz range). Finally, start with a voltage offset of at least -14 in watttool. You should be able to set the mem to 1900mhz, but you may have to lower the p7 mem/gpu voltages even further. I'm getting 27/730 eth/dcr hashrate with 9.3 -dcri27 on a 4gb 470 msi gaming x. My msi ref 480's 4gb with hynix mem have the memclock at 2000 with everything else the same and the hashrate is ~28.6/800 eth/dcr. According to kill-a-watt all of the 480's use <100w for dual mining, and all the 470's <90w. I've got dozens of polaris cards and for me msi is the best for mining!