• What
    is this?
    You've landed on the AMD Portal on AnandTech. This section is sponsored by AMD. It features a collection of all of our independent AMD content, as well as Tweets & News from AMD directly. AMD will also be running a couple of huge giveaways here so check back for those.
    PRESENTED BY

Power, Temperature, and Noise

Last but not least as always is our look at the power consumption, temperatures, and acoustics of the Radeon HD 6670 and Radeon HD 6570. As we’ve noted previously, these reference designs won’t be sold in the retail market, so while our performance data and power data should be consistent with other cards, temperature and noise data is going to be very dependent on the specific cooler used.

Radeon HD 6570/6670 Voltage
6570 Idle 6670 Idle 6570 Load 6670 Load
0.9v 0.9v 1.1v 1.1v

Both the 6670 and 6570 have the same load voltage of 1.1v. This caught us a bit off guard, since lower clocked parts normally enjoy a lower load voltage. This will be of importance when we’re looking at load power consumption.

At idle we’re running up against the limits of what a 1200W PSU can do.                In reality the 6450 should be consuming at least a few watts less than the 6670 and 6570. The fact that all 3 cards are among the lowest power consuming cards at idle is not a mistake, however.

Our Crysis power data surprised us some, and we’re still trying to get to the whys. Both the 6670 and 6570 ended up being sub-200W; this is notable because the 5670 draws 214W in the same test and has a slightly lower TDP than the 6670. In spite of what the specs say, for whatever reason the 6670 is clearly well ahead of the 5670 in both power consumption and performance when it comes to Crysis.

FurMark confirms what we’ve seen with Crysis: the 6670 and 6570 consume less power than the 5670 even with their similar TDPs. In fact the 6570 consumes 5W more than the 6670 even though the latter is the higher clocked and should be the higher consuming card. Given that both cards use fully enabled GPUs at the same load voltage, the difference looks to come down to minor variations in the quality of the individual chips. In this case our 6670 appears to use a better chip than our 6570, hence the difference.

In any case the load power consumption looks very good. The 6670 edges out even the much slower GT 430, while the 6570 similarly edges out the GT 220 DDR3. AMD has done a lot of work on power consumption for Northern Islands and it shows. Meanwhile the fact that the 5750 draws around 25W more is both a curse and a blessing – 25W is quite a lot when Turks cards only draw around 60W in the first place, on the other hand that 25W comes with a lot more performance.

Idle temperatures are roughly where we expect them to be. The 6570 is consistent with the other cards using that model cooler, while the 6670’s new double-wide cooler makes it competitive with all but the coolest of our cards.

Since we’ve already established that the 6670 and 6570 have similar levels of power consumption, temperatures are almost entirely a product of the cooler in use. The 6670 has a larger cooler that can move more air, and as a result it’s much cooler than the 6570 under Crysis. In fact the 6570 is probably at its limits for what AMD’s single-wide low-profile cooler can do; dissipating the roughly 40W the GPU produces is no small task for such a small cooler.

Coming from Crysis our temperatures rise slightly, as is normally the case. At 69C the 6670 is extremely well cooled, while the 6570 is quite warm at 82C. Though we won’t see either cooler at retail, this should be a good idea of the range we should expect to see. A double-wide cooler should make for a very cool card, while a single-wide cooler delivers reasonable performance but it will definitely be warm.

For idle noise, both the 6670 and 6570 are where we’d expect them to be, which is to say almost silent. The 6570 does end up being a bit louder than our noise floor though, which is an interesting outcome given that the 6450 and 5570 are at the noise floor using the same cooler.

We’re not going to read into our noise results since partner cards will be so different, but if they’re anything like the AMD reference cards then things look pretty good. We’ve had quieter cards, but nothing pushing 60W in a low-profile form factor. If partners go with a full-factor design, then they should be able to meet (or beat) the GTS 450 in noise levels at the cost of some space.

Meanwhile we expect to see passively cooled cards, which should be quite attainable with a full-factor card to hold a larger heatsink.

Compute & Tessellation Performance Final Words: It’s Nobody’s Business But The Turks
POST A COMMENT

53 Comments

View All Comments

  • codedivine - Tuesday, April 19, 2011 - link

    Just a clarification:. I guess these don't support fp64? Reply
  • Ryan Smith - Tuesday, April 19, 2011 - link

    Correct. AMD only supports FP64 on the 5800, 5900, and 6900 series. Reply
  • haplo602 - Tuesday, April 19, 2011 - link

    6800 do not ? Reply
  • Ryan Smith - Tuesday, April 19, 2011 - link

    Also correct. The 6800 series (Barts) does not support FP64; AMD opted not to include it to save on die space. Reply
  • haplo602 - Tuesday, April 19, 2011 - link

    awww so my choices got reduced to the 5850 :-( Reply
  • Taft12 - Tuesday, April 19, 2011 - link

    At $150, 5850 is the obvious choice anyway (today - 6570/6670 launch day)

    http://www.newegg.com/Product/Product.aspx?Item=N8...
    Reply
  • Macabre215 - Tuesday, April 19, 2011 - link

    Eh. If this is your price point you might as well go with a 5670. Reply
  • Taft12 - Tuesday, April 19, 2011 - link

    Not if you want the 6xxx-series features. Reply
  • OzzieGT - Saturday, April 23, 2011 - link

    Why? 5670 costs only $5 less on newegg right now and it uses more power. I would rather pay the extra $5 for the newest generation card if it offers the same performance. Reply
  • dagamer34 - Tuesday, April 19, 2011 - link

    Don't these cards do AMD 3D? That's the only reason for someone to upgrade a previous HTPC card to something with a Turks GPU. Reply

Log in

Don't have an account? Sign up now