Mac Pro 2008 3,1 and nvidia gtx 980

Hi guys I currently have my mac pro 2008 fitted with a gtx 680 (Yosemite 10.10.3). I was considering getting a gtx 980 but unsure if that would give me any boost with gaming considering the age of the cpu etc
I currently have a hybrid drive with half dedicated to Mac and the other is windows 7. I play games fine on my windows 7 partition. Anyone fitted a 980 and can let me know if they have been able to boost their gaming quality and framerate or is the bottlenecks of the cpu on the mac not worth the investment?

 

Lack of a boot screen with the new GPU, as shown in the above video, might be a problem if you're dual booting. A workaround would be to install an OS X application called BootChamp, which gives you the option to boot to Windows from the menu bar, since you would be unable to press and hold alt/option at the boot screen to load up Windows when you first power on the machine.

Once in Windows, you can use the Boot Camp control panel taskbar icon to reboot into OS X.

Not the most elegant way of doing things, but it might be worth the trouble considering how powerful the new GPU would be.

 

Thanks I've seen the vid before. The 680 works perfectly on bootcamp so would hope the 980 wouldnwork the same way. However I'm worried that putting a 980 in the mac would be like putting a ferrari engine in an old skoda. Would the 980 actually give my gaming a great boost or is it severly bottlenecked by the cpu, ram etc I have 10gb of ram and the cpu is the original one.

 

Still googling around but doesn't seem to be anywhere to suggest the performance of the gpu in this mac.
If it helps it will be in windows 7 mode for gaming.

 

I would skip the 980. even a 980m can be bottlenecked badly by a few last gen mobile CPU's which are substantially faster than the Xeon E5462 you have ( they are about the same as an i3 3110m in some cases a bit slower. \Also comparable to the Core 2 Quad 9550 I believe ). im not sure on the desktop side but on the laptop side you can bottleneck a good i3 3rd gen with a 560m

I still have a 4.1 ( 2009 model same as in the video ) and its dual quad core configuration still cant keep up with an old Quadro 3000. letalone a K or M series. also from what im reading Maxwell based GPU's plain wont work right but I have yet to look into it much as I have shifted my heavy work to different units and my old Mac Pro's are more for legacy projects and a file server.


sort of on topic I know my daughters old i3-4160 desktop occasionally bottlenecked her ASUS gtx 770 in some games she played so we bumped her to a midrange i5