Is 430Watts enough for my build?

Should be fine. for the 5450. Youll need the cx500 for the 7770 upgrade though!

Is 430 watts enough for a low profile geforce gt 430?

more than enough, if its possible to run an i5 and a 6870 on a decent 430w psu, then a low powered HD x450 and an apu should not be costly on the psu.

Yes cx430 is plenty for a gt430. Definitely consider the cx500 if you are planning future upgrades.

I dont know very much about hybrid crossfire but amd GPU's should work better with your APU.

It probably will work. although Amd recommends 500w supply, better to stay within the guidelines.

http://www.amd.com/us/products/desktop/graphics/7000/77...

 

Do you know that they recommend 500 watts or greater for the 7970 as well ?
http://www.amd.com/us/products/desktop/graphics/7000/79...

Do you know that the 7970 can draw 3x as much power under Furmark load ?
http://ht4u.net/reviews/2012/amd_radeon_hd_7700_test/in...

How about the apu? It's a pretty low power item
http://www.xbitlabs.com/articles/cpu/display/amd-fusion...

Hmm, 100 watts for the 7770 running Furmark + 70 watts for the basic system running LinX
170 watts

With the specs he gave us, there's not much chance of the OP ever putting a 50% load on a CX430, it's more than enough

http://www.hardwaresecrets.com/article/Corsair-CX430-V2...

Read this review and see that CX 430 can deliver a bit more than 430W. So u are set with the PSU  

Best answer selected by lucarai.