MSI GTX970 GAMING 4G - Electric noise when mid-full load

Question

Two days ago i bouhgt gtx970 and now im testing that always appears an insupportable noise form GTX that gets inside my brain. For example, while im playing bf4 and shut down speakers noise can be heard in all house. IT is an electric noise, like a FSSSSSSSSS that always increase or decrease with grafics movements.
I dont updated GTX Bios. I have been reading and this issue is called "COIL WHINE", have any sholution o i have to do RMA. Of course im not going to waste 360€ for a noise gcard.
MB is Z77A-G43 (MS-7758)
MB Bios is 2.D0
Gcard Bios version is NV316MH.126
PD: sorry for my english

Answer 1

I have to tell that i have download CPUZ and in nvidia panel pcie is set up to 2.0 instead 3.0. I check it runing GPU test in windows to mid/full load 970.
In Bios pcie is set as "AUTO" newgen 3.0
Operating system64-bit Windows 8.1 (6.3.9600)
Motherboard MSI Z77A-G43 (MS-7758) - with bios 2.D0 (lastest)
Processor Intel Core i5-2500 Processor 3,3Ghz
MSI GtX970 with Bios NV316MH.182 - Driver version9.18.13.4475
Memory 8192 MB
Module 1 - 4.096 MB Kingston DDR3 @ 667 MHz
Module 2 - 4.096 MB Kingston DDR3 @ 667 MHz
Hard drive model 160 GB INTEL SSDSA2BW160G3H
2nd HDD - 500GB no SSD
PSU: APP650PS
   AC INPUT: 115/230w 16/6A 47-63hz
   DC OUTPUT +3.3V(24A) +5V(20A) // +12V (30A) +12 (22A) // -12V (0.3A) // 5V(3A) // BLK (COM) //GRN (PSON) //GRY (PWOK)
   POWER:            130wMAX          // 560 W MAX               // 3.6W          // 15w     // RETURN     // REMOTE     // PG
   MAX POWER 650W
Here you got all information you asked