What power supply is for 6770?

I have this unknown brand called genie power which is 600 watts, been using for 6 months now and I have this issue of lagging in black ops. I've upgraded my gpu once and cpu twice already and still lag in some scenarios. It's the only part that hasn't been upgraded yet. Oh so that you wont be telling me i need a descent cpu, i have a core i3 2120 and i think it should be running black ops at low-mid setting smoothly but it doesn't. So what power supply would you recommend for my graphic card? what brand? i wan't something like 450-500Watts maybe because i don't want to spend too much money on psu. I think i can handle about 50-100$.
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More about what power supply 6770
  1. Providing a budget is good
    Providing your location so we know where you might be able to purchase from, and full specs is the best way to get a decent psu reccomendation
  2. What are your complete system specs? This could be drivers, spyware/malware, a virus. There are plenty of great PSUs in your price range, but it may not fix your issues.
    Potential PSUs:
    1. OCZ ModXstream Pro 500W: http://www.newegg.com/Product/Product.aspx?Item=N82E16817341016
    2. Silverstone ST-50F: http://www.newegg.com/Product/Product.aspx?Item=N82E16817256061
    3. Corsair CX500: http://www.newegg.com/Product/Product.aspx?Item=N82E16817139027
  3. Operating System
    MS Windows 7 Ultimate 64-bit SP1
    Intel Core i3 2120 @ 3.30GHz 48 °C
    Sandy Bridge 32nm Technology
    4.00 GB Single-Channel DDR3 @ 665MHz (9-9-9-24)
    Gigabyte Technology Co., Ltd. H61M-DS2 REV 1.2 (Socket 1155) 42 °C
    ASUS VH192 (1366x768@60Hz)
    AMD Radeon HD 6700 Series (Sapphire/PCPartner) 47 °C
    Hard Drives
    488GB Western Digital WDC WD5000AAKX-001CA0 (SATA) 44 °C
    Optical Drives
    HUAWEI Mass Storage USB Device
    ATAPI iHAS324 A
    Realtek High Definition Audio
  4. I doubt you're using much more than 200W at full load. If your gaming performance is due to the PSU then it's because it's faulty not because it's underpowered. Low-quality PSUs failing or being faulty is nothing unusual, but I'd start by:
    1. Updating to the most recent drivers,
    2. Running a thorough sweep with anti-virus software and anti-malware/spyware software,
    3. Using a system cleaning software like Advanced System Care (free version on CNET); this program also has a gaming optimization mode to help increase performance: http://download.cnet.com/Advanced-SystemCare-Free/3000-2086_4-10407614.html?tag=mncol;5
    4. Tweaking settings in the game,
    5. Use a utility like Process Explorer to figure out if something on your PC is eating up RAM/CPU cycles: http://download.cnet.com/Process-Explorer/3000-2094_4-10223605.html?tag=api
  5. another info is the psu came with the cheap casing i bought.
  6. don't mind the temperature pls, i'm playing minecraft right now
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