Is a safe temperature for GPU?

[siggames]

I have a pc with GTX 960 Strix ASUS 2GB GDDR5 128 bits OC, which has 35 to 42 ºC in idle, but in average load how internet explorer, google chorme with videos in 720 HD, 1080 HD how youtube the temperatures are 45 ºC to 51 ºC  that is if the fans are off, in gaming are 60 to 65 ºC depending on the load and the videogame, and it has a coil whine in any loads.

 

My psu is a Seasonic s12 II 520 watts 80 Plus Bronze 5 years warranty, ASUS H81M-A LGA 1150, Intel Core i3 4170 3,7 Ghz, 8gb ddr3 1333 Mhz Dual Channel, Cooler Master Hyper EVO 212, Cooler Master CM 590 III Case, 2 HDD Western Digital Caviar Blue of 1 TB of storage and the gtx how videocard.

 

I have other pc with Intel Pentium G3260 3,3 Ghz, Gigabye H81M-H LGA 1150, 6GB DDR3 1333 Mhz Dual Channel Kingston, Corsair CX 550M 80 plus bronze grey label 2015 5 years warranty, 1 tb western digital caviar blue, generic case, cooler stock of intel and the GTX 1050 ASUS Dual OC 2GB GDDR5 128 bits, the temperatures are 30 º c to 35 º C, in average load are 35 to 42 ºC, in gaming are 45 º to 51 º C, beacause this processor is weak for gtx 1050, i know is a bottleneck, this graphics card always found the fans a difference with the gtx 960.

 

Is my GTX 960 has a normal temperatures? I think buy a GTX 1050 TI ASUS Rog Strix oc 4gb gddr5 128 bits for doubts.

 

 

[Shoob]

Perfectly normal temperatures. Coil whine is increased by higher framerates.

[-rascal-]

65*C is 110% okay.

Modern GPUs don't start to throttle their boost speed until around ~80*C.

Starts to thermal throttles at around 90*C ~ 95*C.

 

Personally, I'd like to keep my GPUs under 75*C during gaming usage.