Overclocking GTX 760

Like the GTX 770 last month, the GTX 760 is clocked relatively high. Its 980MHz base clock is 65MHz higher than either the GTX 670 or GTX 660 Ti. As a result some of the overclocking headroom that we would expect has been eaten into by the overclock. Yet on the other hand the higher voltage for the highest boost bin – 1.2v versus 1.175v – gives us some additional overclocking headroom as long as our cooling can keep up.

At the same time the GTX 760 gets a slightly larger TDP adjustment window than most other GK104 parts. Here we can push the TDP up by up to 15%, from 170W to 195W. This is actually more than the GTX 770, so in TDP limited scenarios we should have a slightly easier time hitting the higher boost bins.

GeForce GTX 760 Overclocking
  Stock Overclocked
Core Clock 980MHz 1130MHz
Boost Clock 1033MHz 1183MHz
Max Boost Clock 1149MHz 1306MHz
Memory Clock 6GHz 6.5GHz
Max Voltage 1.2 1.212v

In practice GTX 760 ended up exceeding our expectations. In fact it even ended up exceeding GTX 770 with regard to the size of the overclock and the highest boost bin we reached. Altogether we were able to increase the core clock by 150MHz on our GTX 760 sample, going from a base clock of 980MHz to 1130MHz. At the same time our max boost clock went from 1149MHz to 1306MHz, making this the first Kepler we’ve seen to surpass 1300MHz. The end result is that core overclocking ends up being more potent than we were expecting.

Meanwhile the memory overclock is fairly standard for a GK104 part. It’s something of a roll of the dice, and in this case we were able to hit 6.5GHz before memory performance started regressing. Thus we’re altogether looking at a 15% core overclock coupled with a milder 8% memory overclock.

Given GTX 760’s base shader/texture performance deficit due to only having 6 SMXes, overclocking proves to be very effective on our final results. The performance gains in all 5 of our games were on the order of 12% to 14%, just a bit less than the core overclock itself. With the wide gap between the GTX 770 and GTX 760 in terms of specs this generally isn’t enough to completely catch up to NVIDIA’s top-tier GK104 card, but it can erase a large portion of the gap.

The end result of this overclock won’t dramatically change the GTX 760’s performance profile, but it should help to push it over 60fps in those situations where performance at 1080p at ultra quality settings was marginal. Or from a fixed performance standpoint, we’re approaching Radeon HD 7970 performance with this overclock.

Moving on to power consumption, increasing our TDP has the expected hit. GTX 760 of course has a larger adjustment window than GTX 770, so the increase in power consumption ends up being noticeably larger. Overclocking in this manner pushes the GTX 760 off of the power/performance efficiency curve to some degree, so the GTX 760 loses its edge in that respect.

The end result is that power consumption at the wall jumps by 40W under BF3, and 50W under FurMark. This is tied with and better than the stock GTX 770 respectively, though as we’ve already seen it doesn’t match the GTX 770’s rendering performance. Furthermore as we’ll see, cooling is going to play a big factor here, with the reference GTX 760 cooler not always being the best choice for overclocking.

With the temperature limit raised to 95C, the reference GTX 760 cooler reaches equilibrium at 85C under BF3 and 87C under FurMark. These temperatures are still easily within spec for GK104, but they’re definitely starting to crawl up here. Meanwhile, though it’s not directly measurable the impact of leakage is certainly making itself felt here. If we had cooler temperatures power consumption would at least be marginally lower.

Finally we noise we can see that those new equilibriums also come at new, much higher noise levels. The reference cooler can keep up with the higher heat load created by overclocking, but it’s having to work hard to do so. These noise levels aren’t terrible – in fact they’re about even with the reference 7950 – but they do represent a real cost in terms of noise. Consequently, unlike NVIDIA’s Titan cooler that comes with the reference Titan, GTX 780, and GTX 770, when it comes to GTX 760 there’s very clearly room for improvement with custom coolers.

Power, Temperature, & Noise Final Thoughts
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  • YukaKun - Tuesday, June 25, 2013 - link

    And where's my beloved GTX670?! Are you guys hiding something here that nVidia doesn't want me to see?

    No, but really; I know it's not it's direct replacement, but I'd really like to see the numbers how they stack up.

    Cheers!
  • Ryan Smith - Tuesday, June 25, 2013 - link

    The GTX 670 is in all of our charts. All of this data is also on Bench.
  • YukaKun - Tuesday, June 25, 2013 - link

    Yeah, just realized it is... I wonder why I didn't see it, lol.

    Selective reading at its finest indeed.

    Thanks Ryan!
  • HisDivineOrder - Tuesday, June 25, 2013 - link

    AMD is now saying the Never Settle Reloaded bundle is running out at retailers. That means, you should be mentioning that it isn't going to last much longer and doesn't really factor into the value of the 7950/7950B unless they decide to renew it.

    I suspect though they'll do a price drop soon.
  • DanNeely - Tuesday, June 25, 2013 - link

    I'd expect them to create a new bundle instead.
  • kallogan - Tuesday, June 25, 2013 - link

    Too big, barely better than 660 ti at higher power consumption. What's the point ?
  • MrSpadge - Tuesday, June 25, 2013 - link

    Too big: there will loads of custom coolers, just like on the current cards. Shorter ones as well.

    barely better than 660 ti at higher power consumption: the additional performance is approximately proportional to the added power draw, so efficiency hardly suffers. Of course I'll stick with my OC'ed 660Ti, but this newcomer is just more balanced for everything but the most pure compute tasks.

    What's the point: cheaper for nVidia to produce (one SMX less) and sold cheaper. It's a win-win.
  • jimwatkins - Tuesday, June 25, 2013 - link

    I suppose this is of little interest to most readers, but since your doing computer performance, how about a bitcoin GH performance chart. Video cards are actually of waning value in the bitcoin arms race but it's an interesting aspect of compute performance nonetheless and the high end AMD cards certainly still produce value.
  • dcianf - Tuesday, June 25, 2013 - link

    I'm excited to see them maintain compatibility with my 660Ti/670 full card waterblock. PLEASE LET THIS BE A NEW STANDARD!
  • JimmiG - Tuesday, June 25, 2013 - link

    Well it's hotter, more power hungry and louder than the GTX 670 while still being slower, which is kind of disappointing for something that's supposed to be an evolution of the GTX 600 series. Still, it does feel like "GTX 660 Done Right" in some ways, as that card was always too slow, forcing people to pay $400 for the GTX 670.

    It's sad that prices have been creeping up so much without people noticing. $499 used to be the "ultra-enthusiast" segment, and $199 would buy you a very decent card. In 2012 and early 2013, $400 was the "mid-range" and $999 the "ultra high-end". GTX 760 brings the mid-range back to $250 again, at least until the GTX 860 come out at $499...

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