I can get to boot and run for a while 4560/3200/4125 cache 15/15/15/35 but it's not stable at faster timings (14/14/14/34)and not sure it's stable at that tbh. Several crashes playing World of warships at 14/14/14/34 for example which is barely stressing the system at all. 3000 with tighter timings seems sweet spot and CPU at 4.5/4.125 cache 13,13,13,34 2T with 125 BCLK. I'll have another fiddle tomorrow but my bios won't allow 4.5/4.125/3200 which is annoying. I'm on 1.375 vcore which I know is a lot (Corsair H110i with Noctua fans). Temps are fine when gaming but it cooks if I run CPU stress tests with all cores at 4.5. Only putting 1.40V through Ram so might try and up that to 1.45 and see how it responds. I need 125 bclk and also read that was the way to go on ROG X99 guide a while back. Thanks for the feedback/tips!