I have the low cost one it is good but has a weak pcb. so if you hang it in a tower you have to figure a way to support it. mine is in a cooler master elite 120 build and it does not hang it is mounted so that it rests on the board and needs no support. I am pulling a bad review from newegg
this will happen to you with a side mount. and gravity pulling it.
"... Cons: This card lacks support for the PCB board and with the weight of the dual fan cooler pulling down on it and the heat from the GPU lighting it up in games I suspect it is causing the PCB board to warp which in turn is the cause for the screens shutting off and/or random BSOD after two weeks of use. Get a clue Sapphire you should have put a backplate on these cards to help support and equal the load of the heatsink across the board and to also help the board stay STRAIGHT. Instead you put some flimsy little support bar along the side like that was going to do something. ..."
I do not know that reviewer but i have 14 hd7970's and 2 7950's.
1x powercolor 7990 which I counted as 2 7970's
1x powercolor 7970 reference
1x visiontex 790 reference
3x xfx 7970's 925 double fan
1x xfx 7970 1000 black double fan voltage
1x xfx 7970's 925 double fan voltage locked annoying this is my newest one and I don't reccomend buying it since it has locked voltage
2x msi 7970's reference 1x
1x msi 7970 reference oc version
1x sapphire reference 7970
1x sapphire double fan
and 2x msi 7950's
they all are good for bitcoin mining if used correctly.
So I know that low cost sapphire has the most flimsy pcb by far.. > for the good it is quiet it down clocks to .990 volts and 950 speed runs around 65 c and 99 % 24/7/365 but i have it resting in the coolermaster elite 120 so it is supported by the mobo with 0 strain on the pcb.
look as these types of builds I have a sapphire reference in one I have the lower end sapphire you picked in the second one and I have a msi reference in the third one. the reference ones could hang and work but the sapphire you like is flimsy it has to rest like these do.
I would buy it if you want to mount it like my builds or if you want to support it if it hangs on the side. One last thing I did run it at 1.100 volts and 1040 mhz for a day straight but I have found for bit coin my power to hash numbers are best at about .95-.98 volts 925-940 speed on just about all my 7970 cards.