Upgrading Graphics Card, Do i need a new PSU?

Hey Everyone,

I am planning on upgrading my graphics card from a Sapphire Toxic 2GB 6950 to a GeForce GTX770.

I'm currently running a Antec HighCurrent Gamer 750W (Non modular) PSU.

I was wondering if I need a higher watt PSU?


Other Specs for my Computer.

CPU: Intel Core i5-2500k 3.3ghz (not overclocked)

Mobo: MSI Z68A-GD55 (B3) LGA 1155 Intel Z68 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard with UEFI BIOS

RAM: G.SKILL Sniper Low Voltage Series 16GB 240-Pin DDR3 SDRAM DDR3 1600

Hard Drive: Crucial M4 128GB SATA III SSD

1TB Seagate Storage Drive
8 answers Last reply
More about upgrading graphics card psu
  1. That PSU is fine. You could run a pair of GTX770s in SLI with it.
  2. Thanks for the quick response.

    Now, if I was looking to replace my current PSU for a Modular one. Any good suggestions? I'm getting tired of dealing with cables that aren't being used >:[ Oh, and I won't be running any SLI in the future and I'm only running one monitor.
  3. Hmmm, the Seasonic G550 would be a nice choice for a single card.
  4. There is a modular vesion of that psu now.
  5. The best buy is a Corsair HX650 semi modular for $80 after $25 mir 7 year warranty and made by Seasonic.
  6. The Seasonic G-series is all modular. Since 750W isn't needed, I'd get the more efficient Seasonic.
  7. Thanks for all the suggestions guys.

    One last question, I'm competent enough to build my own computer but it doesn't necessarily mean I understand why everything works.

    Is having unused watts ruin performance or is it harmful to the PC? Or are the suggestions for lower watt PSU simply to keep costs down and maximize efficiency since I won't need more than those watts?
  8. Missed the Corsair HX post. Yeah, that's a good one too.

    A PC will only draw the power it needs. A PSU operates most efficiently in the middle of its range (40%-60%), but that matters less with better-quality (e.g. Seasonic) PSUs which tend to be efficient even under 20% and up to 100%.
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