I'm in between these two cards. The only thing that I'm stuck on is the PSU requirement. Nvidia very nicely state on their site that the 770 will require a minimum of 600w. Now I had a 550w Gold 80+ Seasonic G Series on my parts list but am now considering upping it to the 650w Gold 80+ G Series (If need be). Is the 600w recommendation from Nvidia in case of people cheap 600w PSU? Would I be able to run a 770 on a 550w 80+ Gold?
Then there's the requirement for the 280X Toxic. I had a look on Anandtech and it seems the 280X is quite a hungry piece of kit. Can anyone shed some light on this? Sapphire recommend a 750w PSU but again is a 750w 80+ Gold needed or is this for 80+ Bronze?
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Saphire Toxic 280x without a doubt! with a decent 650watt PSU.
Though if you consider the GTX 770, grab a decent 600~650 watt PSU.
A 650w good branded PSU would be enough for the R9 280X. So you should get a 650w if u want a R9 280x. The 280X is better than the 770 as well. But if you want the 770, it wont be neccessary to replace your PSU.