Flomax - yes, you right!
This is over "target temperature" limiting.
I solve it by buying new PC case, renew thermal compound on cards, and install third GTX 970.
Three cards on default settings(430kH/s) is too loud, but i little slow down hash speed. I set target temperarure 78 deg.C and quiet fan profile. (40% speed on 80C temp.)
Hash.Type......: WPA/WPA2
Speed.GPU.#1...: 129.0 kH/s
Speed.GPU.#2...: 142.5 kH/s
Speed.GPU.#3...: 118.4 kH/s
Speed.GPU.#*...: 389.9 kH/s
GPU.#1 - ASUS STRIX-GTX970-DC2OC-4GD5
GPU.#2 - Palit GTX 970 JetStream
GPU.#3 - Palit GTX 970 JetStream
Note:
GPU.#1 - stock overclocked less.
GPU.#2 - gets cool air.
GPU.#3 - get very hot air from other cards.
Also I measured power consumption, in 390kH/s speed my PC gets 425-440 Watts of energy. It means, new Maxwell NVIDIA architecture takes average 1kH/s WPA per 1 Watts energy.
PS. I'm happy now! full 10 digit bruteforce takes 7 hours! and PC purrs like a kitten.
This is over "target temperature" limiting.
I solve it by buying new PC case, renew thermal compound on cards, and install third GTX 970.
Three cards on default settings(430kH/s) is too loud, but i little slow down hash speed. I set target temperarure 78 deg.C and quiet fan profile. (40% speed on 80C temp.)
Hash.Type......: WPA/WPA2
Speed.GPU.#1...: 129.0 kH/s
Speed.GPU.#2...: 142.5 kH/s
Speed.GPU.#3...: 118.4 kH/s
Speed.GPU.#*...: 389.9 kH/s
GPU.#1 - ASUS STRIX-GTX970-DC2OC-4GD5
GPU.#2 - Palit GTX 970 JetStream
GPU.#3 - Palit GTX 970 JetStream
Note:
GPU.#1 - stock overclocked less.
GPU.#2 - gets cool air.
GPU.#3 - get very hot air from other cards.
Also I measured power consumption, in 390kH/s speed my PC gets 425-440 Watts of energy. It means, new Maxwell NVIDIA architecture takes average 1kH/s WPA per 1 Watts energy.
PS. I'm happy now! full 10 digit bruteforce takes 7 hours! and PC purrs like a kitten.