Need some help overclocking my 290x
The biggest problem with overclocking Hawaii is that you pretty much need them under water to really reach a high core clock. I had two 290's (still have one, gave the other to my brother) and neither would overclock worth squat on air. after modding them with Kraken G10 and Corsair AIO coolers, I was able to reach 1225/1550 on one, and 1225/1600 on the other without an issue.
You are using trixx, which is the best for Hawaii overclocking so thats good. The only overclocking advice I can share is that with Hawaii the memory voltage is tied to the core voltage. some people mistakenly think auxiliary voltage is for memory, but aux voltage is there if you need to offset Voltage droop under extreme overclocks. you may find that your highest memory clock is 1300-1400mhz, but if you bump core voltage up by say +50mv, you suddenly might get another 50-100Mhz highest memory clocks. Overclocking Hawaii is very counter-intuitive, but you basically need to increase core voltage to get better memory clocks. with air cooling you might not get too far with the gpu frequency, but even still memory overclocks really help performance with Hawaii.
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