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Gigabyte GTX 770 (2GB) overclock - severe throttling

Today I decided to finally overclock my Gigabyte gtx 770, and all was going swell, getting 58fps on heaven ultra 1080p, with it sitting at 1333mhz core and 3855mhz memory (7710mhz effective), when I put my memory clock up a tad and it began to throttle severely, way down to like 810mhz memory and 1ghz core. I was worried I'd blown something but then my temps were always below 70c. I'm worried it's my PSU telling me it's struggling, could this be possible? It's a 620w 80plus bronze Antec Neo Eco 620c. Have I got enough watts? Should I be worried I'm pulling too much for it to handle?
For what it's worth, I have an i5 2400 and a single hard drive hooked up to the PSU in addition to my 770
I rebooted my PC and it went through a run in heaven at stock fine, and went though another run on my current overclock settings with some stuttering. No throttling just yet!
Reply to bubblegum_bill
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  1. Best answer
    I wouldnt worry too much, I think you just found your optimal overclock.
    Generaly once you test to fail, back the numbers down a little bit and thats your OC.
    For a 24/7 machine back it off a little more for stability.

    Just keep an eye on your temps, voltage, performance etc for a break in period.

    Peace
    Reply to leigh76
  2. leigh76 said:
    I wouldnt worry too much, I think you just found your optimal overclock.
    Generaly once you test to fail, back the numbers down a little bit and thats your OC.
    For a 24/7 machine back it off a little more for stability.

    Just keep an eye on your temps, voltage, performance etc for a break in period.

    Peace


    Cheers for the reply, I think you're right, as I've now got it running at nearly 8ghz memory and 1.3ghz core with no overvoltage. I think it was my voltage that was the issue, even though I only had +5mV on it. With a conservative fan profile it now stabilises at around 59 Celsius under load and around 35-30 degrees idle with fans off. I got around 5 more frames in some games and a lot less stuttering in Forza due to the faster memory, as I have begun to run out with only 2GB memory. I think an upgrade to a 970 or 1060 is calling soon!
    Reply to bubblegum_bill
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