Is there a technical reason why this cannot happen or work for EVGA? MSI does it with some of their cards. They have a switch that enables legacy bios support. My mobo does not support full UEFI and secure boot. It originally came with Windows 7 but have been using 8 since it came out. I was curious about this......

Also depends on what your calling legacy. My mobo does not support full UEFI and secure boot either but works just fine with a gtx 980.
 
Motherboard is a x58 FTW3 if your wondering. IMHO if your still way back on something like a 775, you may want to look at new cpu/mobo first anyways as oppose to new video cards. 

I have 3 GTX 980 HC's installed on a ASUSTeK COMPUTER INC. RAMPAGE IV FORMULA with no issues.
21798 Fire Strike Intel Core i7-3970X Extreme Edition Processor 

I am trying to ride out the shown system in picture until Windows 10 hits. Its still imo a very capable machine and I have no problems really playing the latest games. BUT. It is a OEM custom build by HP when I bought it. I cannot upgrade to the latest 900 series. It will simply not work with this mobo. Even the 700 series. So, I am kinda in a bind. I think its to old to buy a new mobo and I am sure they are extremely limited selection wise. After all. This is a Sandy Bridge build. In a perfect world. I would love to buy a new mobo and case. Just to get me by and reuse my parts. While upgrading a new card. But, in the end. I don't believe it is really cost efficient if I am going with Windows 10 and a new build next year. This system is coming up on 3 years old in January.
 

 
 
  

Prices are not bad at all. Yeah mine is a micro atx 9.6 x 9.6 to be exact. So, you think its worth it? Mobo and new case to hold me over? That way I can get into the 900 series finally. I don't think I can put it in my current case as those mobo sizes are not 9.6 x 9.6? Some are close though....... Maybe it would still work? My current board is H67 but those H61 seem much better? Especially having pci express 3.0? Mine only has 2.0