Are you running the latest drives? try uninstalling the drivers and installing the latest one from Nvidia. See if it helps. 

HK7x7
At first I want to thank EVGA for replacing my GTX 460 SC with a newer GTX 660 (02G-P4-2660-KR), that was a huge boost! Very kind of you guys.
 
But I have a problem when I want to play for example Battlefield 4, my GTX 660 will be as hot as 80-85C and close the game then. I looked at HWMonitor and it showed me fan speed of max 55%, this is to low to cool down the GK106 chip, isn't it? Then someone told me to download Afterburner and adjust the fan speed with it, well it worked, but without Afterburner it will again be at max 55% fan speed. How can I solve this problem without having tools for adjusting the fan speed? Is there a BIOS update? Will it fix my problem?

The stock fan settings on your video card are setup for optimal performance to noise ratio. Unfortunately there isn't a BIOS update to correct this issue, the stock BIOS are setup for optimal performance to noise ratio. You can easily fix this by setting up a fan curve using evga precision x, the below fan curve is recommended... 
 

Not sure why its capping out at 55% fan. Usually the drivers control the stock fan curve to prevent the card from over heating. You can try and giving EVGA a call and letting them know your replacement card isn't running correctly. I would run a custom fan curve with EVGA precision X and set it to run on start up, if it doesn't go pass 55% fan speed it may be a bad fan. hope it helps.

EVGA...
Fan was a bad one (needed Afterburner), the GPU is defective now, five days after getting it. They gave me a 660 because they didn't have a 460 SC.
Look at those pictures:

abload.de/image.php?img=imagej7ulz.jpg

abload.de/image.php?img=imagegeuq6.jpg

abload.de/image.php?img=imagebnutc.jpg

abload.de/image.php?img=imagewqua3.jpg

What do you mean with "toasted"?
I received the 660 in monday, plugged it in the same PC and uninstalled the Nvidia drivers.
Then I cleaned install files plus registry etc. with CCleaner and after a restart I installed the latest drivers.
Played 5min BF4 and it crashed the game, looked at HWMonitor and saw 85C in GPU. The Fan didn't adjust properly.
After that I installed Afterburner and set the fan speed to custom. I played BF4 again without crashing this time, it was noisy/loud but temps were at max 73C.
Today it randomly crashed the whole PC and after that it looks like ob the pictures.

I have not modded/overclocked anything! They gave me a bad replacement.

This is my PSU: rasurbo.com/RASURBO%202011%20eng/DLP651.html
My 460 SC ran nearly two years without a problem with this PSU!

Doing RMA process again... couldn't play games for more then two weeks now. I bet with you all if I get the same GTX 660 (02G-P4-2660-KR), the problem will occur again at some time or another, because it is their standard 660 which has this problem, I guess the fans are not properly working on all of these standard models. They should update those via BIOS!

Why did my GTX 460 SC, which needs more power, worked for almost two years? I don't think that my PSU is a big problem here. Yes, I know, it's not the best/good one but it's average, I don't need something special. Even if my PSU would give the GPU less power than it is requiering, why did it worked for five days? Why would less power even let the GPU to boot up Windows etc. Why would less power damage the GPU that hard and why does it not work when I put it in a PC with be quiet L8 500W PSU?

(quote removed by the moderator)

First of all welcome to the EVGA forums.  I can understand your frustrations with a computer issue.  We have all been there.  As a new member, I might suggest that you read the TOS here before you continue to violate them.  Cursing and swearing have no place here.  Even if you try to hide what you are saying with **** you are still violating the TOS by doing so.  I am sure that it might be a misunderstanding on your part, however, I might suggest that now that you have been made aware, that you go back and edit your rants.  It is probably not how you would want the community here to garner their first impression of you.
 
That being said,  I also strongly suggest that you take Maniac's advice and do whatever he suggests.  He has helped many, many people here going as far as taking his own time to speak by phone for hours at a time to help members here fix their problems.  He knows what he is doing and has personally help me solve problems in the past.   
 
Again, welcome and good luck solving your issues.

HK7x7
I changed it... (you should also edit your post and delete the quote)
Sorry again to EVGA guys!
 
It can't be the NVIDIA drivers etc.
Even when booting my PC it happens and the NVIDIA driver won't load before booting Windows properly. I also uninstalled the NVIDIA drivers completely via Safe Mode, even then I have those artifacts!

If the card is artifacting in the BIOS (and your pics show it is) then its probably toast and needs to be replaced.
 
Attention:  you should NEVER use "safe mode" for handling Nvidia drivers in any OS , you should NEVER EVER uninstall Nvidia drivers using Win 8 and you NEVER EVER use any type of registry cleaner in Win 8
 
Further you should not be running programs Like HWMointor or any other such software (including MB software like the Asus AI Suite..ECT) in the background.
 
RMA your videocard
You might want to consider wiping the OS install and starting from scratch, given your use of registry cleaners and installed background software.
Come back here when your replacement card comes in --BEFORE-- your install it, and I will explain to you how to handle Nvidia drivers when running Windows 8 
 
 

HK7x7
Why would less power damage the GPU that hard and why does it not work when I put it in a PC with be quiet L8 500W PSU?

Just popping in to answer this question for you.
 
Secondly first: Your L8 500W may also be a low output unit, but lets not get too involved with that yet.
 
Firstly:
The power I was talking about was specific voltage on a rail when above a total from the power supply. In the case I was talking about, you have a PSU droping from 12.1v @ 200 watts system load to 11.8 and lower at 400w system load (on a PSU rated to handle 650w)
 
Specifically on the 12v rail this is where the problem is, sadly the reviewer did not post the power ripple on the 12v rail, but it would be safe to assume if the voltage is dropping that far, there is some power ripple going on, this is where it gets fun now. Once you have voltage ripple, and if it is bad enough, the power coming into your GPU's voltage regulation is bouncing around from anywhere to 12v plus or minus 0.3v to 0.7v I am assuming on the higher side however given the amount of drop the review experienced. This is very hard on the VRM which is tasked with keeping the output voltage steady for the GPU and components. This could EASILY kill a graphics card, all it takes is for the ripple to make it though the voltage regulation, and that can toast a GPU easily.
 
Next, if we assume that there was not a power ripple. Your input voltage is still (according to the review) dropping below 12v, this is not a good sign, as input voltage drops, the amount of amperage goes up, creating more heat, and making the job of the VRM harder, as they now have to handle more initial amperage due to the drop in input voltage. It's not a lot, but it adds up.
 
Short example:
Lets assume your GPU is under medium load, chugging along at ~110w
If your input voltage is 12.1v, you would have ~9.09 amps coming into your card.
If your input voltage is 11.8v, you would have ~9.32 amps coming into your card.
 
No it is not a big difference, but it adds up. Generally if a PSU is having problems maintaining voltage on a rail, there is also normally voltage ripple.
 
I hope this helps you understand why I was asking about your PSU in such detail.

Lordred[...]This could EASILY kill a graphics card, all it takes is for the ripple to make it though the voltage regulation, and that can toast a GPU easily.[...]

 
I understood what you have written but why did my GTX 460 SC hold again nearly two years without a problem? If this PSU is that bad (you say so... they tested the DLP 635, don't know if that is a big difference), I must have been lucky every day for years without any problems.
 
Again, I am sorry for my behaviour, maybe you would have understood it because of other problems besides my GPU being faulty.

maniacvvv
RMA your videocard
You might want to consider wiping the OS install and starting from scratch, given your use of registry cleaners and installed background software.
Come back here when your replacement card comes in --BEFORE-- your install it, and I will explain to you how to handle Nvidia drivers when running Windows 8

I dont think CCleaner deleted something serious which may have to do with how the drivers work. Before cleaning anything I look at the paths etc. and it was mostly deleting folders which didn't exist anymore. And why should I not uninstall with the Windows/NVIDIA Uninstaller?
 
When the replacement will arrive I will formatting my SSD first, install Windows 8.1, install NVIDIA drivers. Is this ok? I will also install MSI Afterburner / EVGA Precision X so I can see information like temperature, fan speed etc, I will not install HWMonitor or I will not start HWMonitor with Afterburner / Precision X.

I could have send the package on monday morning, that would mean it would arrive to you on wednesday morning, you would have send the package wednesday night / thursday morning, I would have got the replacement maybe friday or monday.
 
I am still waiting for you to give me the UPS ID for the pick up... still waiting. I dont think you will send me the UPS ID today, you will close today in 1 hour 15 minutes (5PM local time).
Now if I would send the package (and pay again for shipping), it would be shipped not until tomorrow morning. That means:
Wednesday morning shipping to you -> Friday morning you receive it -> Monday morning you send it -> (with luck) Wednesday morning I receive it.
Next wednesday is 29.01.2014 ... My GTX 460 SC failed on 26.12.2013

maniacvvv

HK7x7
I changed it... (you should also edit your post and delete the quote)
Sorry again to EVGA guys!
 
It can't be the NVIDIA drivers etc.
Even when booting my PC it happens and the NVIDIA driver won't load before booting Windows properly. I also uninstalled the NVIDIA drivers completely via Safe Mode, even then I have those artifacts!

If the card is artifacting in the BIOS (and your pics show it is) then its probably toast and needs to be replaced.
 
Attention:  you should NEVER use "safe mode" for handling Nvidia drivers in any OS , you should NEVER EVER uninstall Nvidia drivers using Win 8 and you NEVER EVER use any type of registry cleaner in Win 8
 
Further you should not be running programs Like HWMointor or any other such software (including MB software like the Asus AI Suite..ECT) in the background.
 
RMA your videocard
You might want to consider wiping the OS install and starting from scratch, given your use of registry cleaners and installed background software.
Come back here when your replacement card comes in --BEFORE-- your install it, and I will explain to you how to handle Nvidia drivers when running Windows 8 
 
 

Would you mind informing us on the proper way to uninstall/install drivers in Windows 8? I made the change from W7 to 8 this week and have held off installing new drivers.

Thanks!