my specs: amd phenom II 955 BE
ati hd 6770 1gb
4gb DDR2 ram (2 sticks of Gskill)
Antec Earthwatts 430 (my current psu)
Western Digital HD 7200
I have 1 sata dvd RW drive and wireless desktop card, that's the only other power draws. I have cpu fan and case fan. I don't have crossfire option, just the one ATI gpu. I was told that am cutting it close and should upgrade my psu.
I'm looking at the Antec High current gamers series at 520 watts or the Antec Earthwatts 650 green, on Newegg. Yes, getting more watts with the Earthwatts. But wasn't sure if the High current psu's might give me more. I want to stay under the $70 price tag, sure there's better choices for more money. Dad on a budget. Getting primed for RAGE.
As far as PSUs are concerned, be informed. Before you buy any PSU read accurate, objective PSU reviews at reputable sites such as www.jonnyguru.com or www.hardwaresecrets.com on the EXACT model PSU that you are interested in as some brands have good and poor quality PSUs.
You can also get an accurate rating of how much PSU power is required for your current or future system at the PSU calculator link below. Once you know the total PSU watts required then you need to confirm that the 12v rail has enough amps. to support your Vid card(s) and the rest of the PC system.
There are several websites that show the Vid card power consumption in watts. Divide the watts by 12 to determine the amps. required on the 12v rail(s). Add 15 amps for the rest of the PC on the 12v rail and you now know the Minimum total 12v rail amps required under full load. It's best to have at least 5-10 amps. reserve on the 12v rail available under full load so the PSU is not loaded to 100%.
It's also worth noting that people often misunderstand the 80% power rating. This is a rating of the PSU's energy efficiency not it's output. 80% plus PSUs use less grid power to produce the same PC power. If it's 80% Bronze, Silver or Gold the cost savings on electricity is pretty small between Bronze, Silver and Gold unless you are paying very high rates for electricity so any 80% rated quality PSU is fine even if not Gold. For those who leave their PC on 24/7 a quality 80% PSU is a good investment.
more amps won't increase performance at stock settings. more amps will give you more headroom for overclocking but even with OC, you won't be approaching the limit of what these PSU can provide in power unless you plan to push parts to the extreme with liquid cooling. if your CPU runs hot (i have the same CPU) look into an aftermarket cooler.