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what PSU are you using? try running the card under different rails even with a good PSU. compared the core clock for your GPU running in both rooms. You might not be thermal throttled but sound like the GPU driver is deciding your PSU can't supply stable power when in use outside your bedroom and lowered the core clock and caused hashrate drop.
I had similar experience with identical GPUs in a rig but one just decided to run 200 MHz lower on it's cclock (obviously, same OC settings) until I ditched the PSU's PCIe rail for an alternative rail via molex to PCIe connectors, basically just spread the load, even with a decent PSU that has enough power (wattage) rating.
Good idea, mine is a TX 750W its quite dated but should handle sli, i will try to switch up psu
Are the two rooms on the same circuit? If not, is the ampere rating different?
Yes, they are on the same circuit
