Overclocking: Power, Temp, & Noise

Of course no review of the Radeon HD 7000 series would be complete without a look at overclocking. In all of our testing AMD’s Southern Islands GPUs have proven to be impressive overclockers, including the reference 7870. In our 7870 review we hit 1150MHz on the core and 5.4GHz for the RAM, which made for a rather hefty overclock.

Our retail cards in turn one up the reference 7870. For core overclocking we hit 1200MHz on both cards, which is a 100MHz (9%) overclock over their factory overclocks, for a total of a rather incredible 200MHz (20%) overclock compared to a 7870’s stock clock. Given the overclockability we’ve seen for the Pitcairn GPU it’s unlikely that HIS, PowerColor, and other partners are having to do too much work for their factory overclocked cards, but we believe there’s at least some simple binning going on here, which would explain the better overclocks we’re seeing on these retail cards.

Interestingly this is all without overvolting of any kind. There still aren’t any tools capable of voltage control on the AMD reference PCB, so the limit is what you can get at reference voltages. If Pitcairn responds well to overvolting though, things could get very interesting in the future.

Memory overclocking wasn’t quite as eventful however, largely due to the fact that all of our 7870s use the same PCB and the same memory chips. Beyond 5.4GHz performance starts to plateau due to error correction. This is still a 500MHz (10%) memory overclock for the PCS+ HD7870 and a 600MHz (12%) memory overclock over the IceQ Turbo 7870 and stock 7870, but at this point GPU overclocking is eclipsing memory overclocking.

So what does a core clock of 1200MHz and a memory clock of 5.4GHz get you? In short, a lot of performance. But first, a look at power, temp, and noise.

The power costs of this overclock are rather consistent for both cards. Under Metro these overclocks drive up power consumption by about 20W at the wall. Meanwhile under OCCT with PowerTune set at +20% (228W), power consumption jumps up by roughly 30W, which is more in line with the shift in PowerTune limits to prevent throttling than it is from the overclock itself. All things considered these aren’t massive increases in power consumption, but on top of the factory overclock it adds up. The PCS+ HD7870 in particular is 42W over the reference 7870 in Metro, which goes to show that while overclocking without a voltage increase doesn’t drive up power consumption as quickly, it can certainly have an impact.

With the increase in power consumption comes the requisite increase in temperatures. At 79C under OCCT the PCS+ HD7870 is still well within our comfort zone, and this is the pathological case. Under Metro the increase is but a fraction, with temperatures going up by only a single degree.

Meanwhile the IceQ Turbo 7870 continues to flaunt its unusual cooler here. Under Metro it reaches a still relatively chilly 62C, and even OCCT can only get the card up to 66C, which is practically unheard of for a 190W card. Once HIS gets voltage controls working, voltage tweakers may very well end up having a field day here as there’s a good 15C+ of thermal headroom to play with on the GPU. Assuming of course that the VRM circuitry on the AMD reference PCB can hold up to further abuse.

Finally, when it comes to noise the fact that temperatures don’t significantly rise under Metro means that there’s a minimal shift in load noise here. Our double overclocked cards are still quieter than the reference 7870, which in the case of the IceQ Turbo is thanks in large part to its low temperatures requiring no further work from the fan. Meanwhile the PCS+ gives up most of its noise advantage here. OCCT on the other hand finally sees every card jump up above 50dB, with both cards tying or beating the reference 7870 by a fraction of a decibel.

Ultimately the second overclock does have an impact on power consumption, but particularly when paying attention to gameplay as opposed to the pathological OCCT, the cost is very cheap. Unless you’re on a specific power budget or need to stay below the equivalent of 50dB on our charts, there’s still a fair bit of headroom to play with on these retail 7870s.

Power, Temperature, & Noise Overclocking: Gaming Performance
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  • Cisephys - Tuesday, March 20, 2012 - link

    Any word on retail availability? Some 7850/7870 cards finally popped up on NewEgg this morning (or maybe late last night), but the PowerColor one there is not the PCS+ version, it's the stock, non-factory-overclocked one.

    Seems like a fairly clumsy launch... But then, I'm likely just impatient.
    Reply
  • CeriseCogburn - Tuesday, March 20, 2012 - link

    Why didn't the article mention it's near barren ?
    Is this now 'just forgotten" ?
    Is AMD favored this much ?
    Really it is absolutely unbelievable the bribe must be spectacular.
    ( i believe it's the free Island Vacation AMD sponsors for 500 of these 'lucky reviewers" - it's an 'information and learning gathering' and 'fact finding mission', of course...
    --
    It's actually missing from the entire article... the phrase paper launch let alone 'availability" is washed over as we are told AMD has after 'unveiling" two weeks ago 'released to retail '...
    So will this be another 2.5 months of near barren shelves ?
    How is it we hear nothing on this matter in the entire article... what sorry excuse will we be given - if any at all.
    There's no mention of manipulating the market with this underhanded tactic and early empty release either ...
    Sorry it's just inexcusable and no you're not impatient, we've been deceived.
    Reply
  • CeriseCogburn - Wednesday, March 21, 2012 - link

    That excuse is beyond ridiculous, as the higher the cards level, the more likely it is one has a willing and avid overclocker.
    It's really getting deep in here. 6970 6950 both top cards of this level a gen back were proclaimed as highly valuable for the OC bias switch.
    I mean it's really, really deep in here, my chest is soaked and fear I might be drinking slop soon
    Let's just tell the truth,
    AMD fans love this, this time.
    But when the nVidia based GTX460 EVGA OC was included to trounce the amd cards in price/perf, the outcry was nothing short of enormous.
    Worse yet, we have just recently been treated to exclamation points on the 7970 20% possible on stock volt Oc'ing raves.
    It's really sad, now please, I'd like to not have to brush my teeth and gargle right now.
    Reply

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