Mind if I ask what clocks you have set in bios for Performance 3D clock table?
If you keep below 670 core, 1404 shader then 1.13v will help you drop temps a bit, you may be able to go slightly lower too.
2D voltage for 200 core, 400 shader only needs around 1.03-1.05v
3D low for 300 core, 600 shader only needs around 1.06-1.08v
3D perf for 602 core, 1296 shader should only need 1.10-1.12v.
My original reference 280 bios was using 1.03v, 1.06v, 1.11v I believe it was.
All the later EVGA bios (bios version ending with greater than 80h)all seem to have 1.06, 1.11, 1.19v for the values set.
If you guys want any 260/280/etc bios modding done let me know in a PM and I'll give you a hand or modify myself. I can help you out set up Automatic Linear Fan Control through the bios if you are a bit confused, the default method of Dynamic fan ratio is hardly acceptable for anybody overclocking on reference cooler.
I'll post up a Nbitor screenshot of my bios too later on for reference and a quick reference for the values.
To get an idea of what I mean my fan duty is set to 50% minimum, Tmin where the fan duty begins to ramp vs temperature begins around 43-44c, by 56-58c fan duty is at 100%, and begins to drop once temp falls. Also I've set up the ramp rate to be gradual to make it next to unnoticable.




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