I currently have an AMD setup:
Asus M4A785TD-V EVO 785G
4GB (2x2gb) Crucial 1333mhz RAM
Sapphire HD 5670 (512mb) GPU
I run this on a 400w Corsair PSU.
If i was to upgrade to a 6670 GPU, and a Phenom II 955 processor, would you recommend increasing my PSU wattage?
2. Slightly off topic i know, but i really didnt know where to put this:
Would upgrading my processor and GPU allow me to stream video games like Starcraft 2 on a site like JTV with less framerate lag on my end? Obviously it will help, but how much of a difference is it likely to make?
3. With this potential upgrade, should i invest in an 'aftermarket' CPU cooler and more cooling?
Thanks for your help in advance! Any questions feel free to ask, and i'll do my best to answer them.
I don't think there is much power use difference between the 5670 and the 6670. I think they both use ~60W. The 6670 isn't much faster either. If you want an upgrade, go for a 5750 or 5770. All of these cards should be fine on a Corsair 400.
The TDP of the x3 440 is 95W. There are a number of different 955s, including a 95W version. If so, there is no extra power draw. Worse case is you'll get one of the 125W (they never made a 140W version did they???) and your system will use an extra 30W.
6670 or 6770? As I mentioned the 6670 is rather close to the power numbers of the 5670, just over 60W. The 6770 has a TDP of around 110W, so if you use one of them it will use a lot more power. (50W) Worst case, 125W + 110W + 50 = 300W(ish). As long as your PSU has 25A you'll be fine. You really want one that has at least 28 to 30A so that you're not running your PSU at 100%. I don't remember how many amps the Corsair 400W has. Double check.
It means of the 400W your PSU can output, it can do (12V * 30A) 360W on the 12V rail. This is important as its the 12V rail that powers your CPU, GPU, board, etc. I said earlier that you'd need around 300W, so your 360W should be fine.