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Thinking of upgrading.

I have been told that for what I mainly want it for, X-Plane 10 it will give me about a 50%increase in the performance.

However it will be used for other flight simulators too and not any other games so out and out performance is not needed.
 
If it's a choice between the 4 gb 770 and a 780, then you choose the 780. Even if I have to spend a little bit extra. What resolution are u aiming to play at? Only situation u may even consider buying a 770 4gb over a 780 is at a huge resolution, and even then a single 770 won't be putting out enough grunt to give respectable frame rates.

If VRAM is of a concern, just get a AMD r9 290 for around £350-370. Msi gaming edition or sapphire tri-x, both are currently in stock (Make sure to Not get reference design but aftermarket coolers version). The 290 has 4GB of VRAM. The 290 is on equal ish footing as a 780 (depending on the game in question), and both the 780 and 290 will walk all over the 770.

I am running at 1920x1080. In X-Plane 10 it actually shows you the amount of VRAM being used for the particular settings you have selected.
If I turn them all up to max it uses about 3.6gb and the frame rate slows down dramatically, I assume because I have only 3gb of VRAM.
 
OK everyone, thanks for the advice. I think I will get a GTX780. Are these easy to overclock? I assume this will make a difference too. The base clock speed on my 660 is 1043mhz and I see the 780's are somewhat lower so would overclocking to say 1100mhz be quite easy??

Thanks
 
I appreciate what you have all been saying but I am more than happy with the 770 and have never been a fan of AMD cards which is why I never even considered one.
 
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