Nah, they coil whine like hell at 1.3v and they are hot as hell at 1.3v 80c+ unless I run default fan speeds of around 60% they stay at 60c. at 1.2v no coil whine at all.
One of my cards is Hynix and one is Eplida, the Hynix card gets about 30c hotter VRM. sinks on it are absolutely not worth a ****.
I only volted them up to 1.2 today to see what the best clocks I can get from running my rig silent. they are both identical vapor-x cards, but like I say the Hynix one is crap, iv always ran it in the top slot. but today ivmoved it to the bottom slot and now both gpus are absolutely equal temperatures to the exact degree because the Hynix card at the bottom now has the free air, and the heat from the vrm is getting drawn into the top card. and I run the fans on them both at 33%, which for a gpu is absolutely nothing on air, most vapor-x cards run around 60% fan speed or above.
so at 1.2v, 1200/1450, they both run at a solid 70c at 33% fan speed, which is only a few % over idle fan speeds, and they are 100% silent. I have 5 corsair AF140s running at the lowest speeds possible, my rigs is that silent I can hear the H110 pump over the top of them so im pleased with what iv achieved with how iv set my system up.
Although ofc, when I run 3dmark, I just ramp up the fan speeds on everything just to be sure I don't fry anything
so to sum it up, if I ran stock fan speeds which is noisy both cards would run at 50-60c.
Hynix top card @ 33% silent fan speeds 1.2v: 77-83c Vrm temp 100c
Elpida bottom card @ 33% silent fand speeds 1.2v: 61-65c Vrm temp 70c
Elpida top card @ 33% silent fan speeds 1.2v: 70c vrm temp 75c
Hynix bottom card @ 33% silent fan speeds 1.2v: 70-71c Vrm temp 80c
& the before temps
Hynix top 33% silent fan speeds 1.138v: 70c Vrm temp 90c
Elpida bottom card 33% silent fan speeds 1.138v: 52c Vrm temp 65c
And at 1.138v I could only get 1150/1450, so iv gained 50mhz both cards and they run equal temperatures and still silent. and it actually makes a difference when gaming, few fps here there better lows fps so im happy, todays clocking session I was just getting the best silent performance that I could.
People say the Hynix cards clock better, but jesus iv not seen no evidence of that, my Elpida memory clocks about 200mhz higher, but I just run them identical. the elpida memory is 1.6v too compaired to 1.5v Hynix, and the vrm sinks on the Hynix are crap.