Mining KAWPOW got this error

[Santy4tas]

+----------------------------------------------------------------+ | GMiner v2.66 | +----------------------------------------------------------------+ Algorithm: KAWPOW DevFee: 1 % Stratum server:
host: stratum-ravencoin.flypool.org:3333 user:
password: x Power calculator: on Color output: on Watchdog: off API: off Log to file: c:\miner.log Selected devices: GPU0 GPU1 GPU2
Intensity: 100 100 100
Temperature limits: 80/120 80/120 80/120

01:53:28 AMD Driver: Unknown 01:53:28 Nvidia Driver: 471.68 01:53:29 GPU0: Memory tweak #3 initialized 01:53:29 GPU1: Memory tweak #3 initialized 01:53:29 GPU2: Memory tweak #3 initialized 01:53:29 Connected to stratum-ravencoin.flypool.org:3333 [172.65.228.1] 01:53:29 Subscribed to Stratum Server 01:53:29 Set Extra Nonce: 0c2bf7 01:53:29 Authorized on Stratum Server 01:53:30 New Job: e4fc4309118ff556dc8b Epoch: #254 Block: #1910670 ProgSeed: #636890 Diff: 431.1M 01:53:30 Started Mining on GPU0: EVGA NVIDIA GeForce GTX 1080 Ti 11GB [0000:01:00.0] 01:53:30 Started Mining on GPU1: EVGA NVIDIA GeForce GTX 1080 8GB [0000:02:00.0] 01:53:30 Started Mining on GPU2: EVGA NVIDIA GeForce GTX 1080 Ti 11GB [0000:06:00.0] 01:53:34 GPU1: Generating DAG for epoch #254 [Single Buffer 3056 MB] 01:53:34 GPU2: Generating DAG for epoch #254 [Single Buffer 3056 MB] 01:53:34 GPU0: Generating DAG for epoch #254 [Single Buffer 3056 MB] 01:53:45 GPU0: DAG generated in 10.95s [279 MB/s] 01:53:45 GPU0: DAG verification passed 01:53:45 GPU2: DAG generated in 11.08s [276 MB/s] 01:53:45 GPU2: DAG verification passed 01:53:53 New Job: 360dd913e3a3b8844b03 Epoch: #254 Block: #1910670 ProgSeed: #636890 Diff: 431.1M 01:53:53 GPU0: Failed to apply memory tweak 01:53:56 Error on GPU0: Device not responding, check overclocking settings 01:53:56 GPU1: DAG generated in 22.55s [136 MB/s] 01:53:56 GPU1: DAG verification passed

The three GPU was overlocked with +450 in Memory

Any ideas of what happened?

[igoralebar]

maybe that GPU can't run +450 with mt 3