Power, Temperature, & Noise

As we’ve discussed in previous articles, with the Fermi family GPUs no longer are binned for operation at a single voltage, rather they’re assigned whatever level of voltage is required for them to operate at the desired clockspeeds. As a result any two otherwise identical cards can have a different core voltage, which muddies the situation some. All of our GTX 460 cards have an idle voltage of 0.875v, while their load voltage is listed below.

 

GeForce GTX 460 Load Voltage
Ref 768MB Ref 1GB EVGA 768MB #1 EVGA 768MB #2 Asus 768MB Zotac 1GB
0.987v
1.025v
0.987v
1.000v
0.987v
1.000v

Our cards end up ranging from 0.975v to 1.025v, a variance of 0.05v. The 1GB cards with additional functional units on average require more voltage to operate, with the lowest of our samples requiring 1.0v. Otherwise 3 of our 4 768MB cards require 0.975v.

On a side note, since we’re using non-matching 1GB GTX 460s here for SLI testing, we’ve added an asterisk for all the power & temperature results. Our results should be very close to what a proper set of matching reference cards would get, but we can’t guarantee that.

 

Idle GPU Temperature

We’ll start with idle temperatures.  With an unofficial idle TDP in the 20W range, the GTX 460 series is fairly comparable to the Radeon 5850, but with a more breezy cooler. As a consequence we can see it edge out the rest of our cards here, with all of the open GTX 460s coming in at 34C for idle. Meanwhile the blower-based Zotac card comes in a hair warmer at 35C. Even with a blower, these end up being the coolest mid-range or better cards we have ever tested, besting even the Radeon 5850.

 

Load GPU Temperature - Crysis

Meanwhile at load the good news continues for the GTX 460 series. The GTX 480 may have been a toasty GPU, but that’s not the case for the GF104 GPU at the heart of the GTX 460 series. Our reference cards do only slightly worse than 60C in Crysis, while Asus’s non-reference card gets that even lower thanks to a more proactive fan. Zotac’s blower doesn’t fare so well here though, coming in at a still respectable but nevertheless higher 73C.

Compared to AMD’s cards the GTX 460 does very well here. The Radeon 5850 is still the sweet spot for a balance of performance and heat, but the GTX 460 manages to do better in terms of heat at a price of lower gaming performance. Meanwhile our Radeon 5830 isn’t even a contender here; as a salvaged Cypress part, it just can’t compete with a part designed for cooler performance from the start. Among all the cards we’ve tested equal to or faster than the 8800GT however, the GTX 460 sets the new bar for how cool a high performance card can operate.

 

Load GPU Temperature - Furmark

The results with Furmark match those of Crysis, it’s just a bit hotter. The interesting story here is going to be SLI temperatures: our 768MB and 1GB SLI cards hit 89C and 91C respectively. This isn’t a problem for NVIDIA’s GPUs (we see single GTX 480 cards do worse) but it’s a massive jump from a single card. For these reasons we would strongly suggest keeping these cards further spaced apart if you have a motherboard that supports it. The GTX 460 reference cooler just isn’t up to the task of pulling in fresh air if it’s next to another card.

 

Idle Power Consumption

Our idle power numbers continue to lower the bar for GPUs of this performance class, although at this point we’re hitting the efficiency limits of our PSU at low wattages. Our 768MB GTX 460s end up sharing the 160W mark with the Radeon HD 5750, while for 1W more you have the 1GB cards.

 

Load Power Consumption - Crysis

 

Load Power Consumption - Furmark

When looking at load power consumption, it’s always interesting to compare the power drawn with the temperatures. While the GTX 460 did very well here with regard to temperature, its power consumption reflects the fact that its GPU is still Cypress-sized. Under Crysis at a 280W load the 768MB part is comparable to the Radeon 5830 and the 1GB part adds around 10W to that. Meanwhile the Radeon 5850 manages to pull just a bit less power here, while the GTX 465 draws some 60W-70W more than the GTX 460. Gmae performance with those two cards may be close – power consumption is not.

As for Furmark the power consumption goes up but the ordering does not. Our 1GB cards now draw 20W more than 768MB cards, but the Radeon 5830 is still in the middle of the pack while the Radeon 5850 comes out ahead. The GTX 465 is now 80W-100W hotter than the GTX 460. Overall with a “proper” Radeon 5000 series card NVIDIA still can’t match AMD on a performance per watt basis, but they can come very close.

 

Idle Noise Levels

Finally we have our look at noise. With cool running cards we often have to look at fan noise to ensure that they aren’t accomplishing that trick by sounding like a jet engine, and in the case of the GTX 460 that’s clearly not the case. Besides being some of the coolest cards we’ve tested at this performance level the GTX 460 cards are also just as quiet as the rest of the best of the cards we’ve tested, hugging the 42dB sound floor in our testing environment. The 1GB reference card is marginally louder, while the partner customized cards are only slightly louder yet. The only card to really flop here is the Zotac GTX 460, which is at entirely the wrong end of our charts. Blowers can be quiet, but the Zotac’s is not – it’s simply a loud card. Unfortunately this kind of an idle noise level is going to put the card out of the running for a lot of buyers.

 

Load Noise Levels

Load noise is more or less like our idle noise results. The 768MB GTX 460 registers the lowest result we’ve ever seen for a card of this performance level, coming in at 46.2dB and the EVGA card right behind it. The 1GB card does end up being louder (likely to compensate for cooling 2 more GDDR5 chips) but it’s still in good company.  Asus’s card cracks 50dB, as it’s tuned for cooling over noise, explaining our earlier temperature results. Unfortunately the Zotac card is once again the odd man out at 61dB, roughly as loud as our GTX 470 is. It’s neither cooler than our reference cards nor quieter, which doesn’t bode well for this stock-clocked card.

Compute & Tessellation Performance Overclocking
POST A COMMENT

93 Comments

View All Comments

  • threedeadfish - Monday, July 12, 2010 - link

    I know you guys are all up in arms when a company releases information about up coming products, but you know that's information that can help a consumer.. I was looking for a card that was powerful enough while being quite and not using too much power. I ended up with a 5770 and I think it's a great product, however this the 460 offers 5830 performance at 5770 power and noise for only $30 more. I would have waited another week if I had any idea this was coming. You can't tell me nobody at Anandtech knew this was coming. Your anti-paper launch campain has a down site, it doesn't give consumers valuable information and as a result the video card I'll be using for the next couple years will be much less powerful then it would have been if the 465 artical just gave me a heads up, or just a little message saying hold off on $200 video card purchases something's coming. I only buy a new video card every few years please give me the information I need to make the best purchase. In this case waiting another week is what I should have done. Reply
  • notext - Monday, July 12, 2010 - link

    If you notice, everyone put out their info on this card today. That is because an NDA. Even suggesting anything about this card without nVidia's permission is a quick way to guarantee you won't get future releases. Reply
  • Phate-13 - Monday, July 12, 2010 - link

    Euhm, where can you find the "at 5770 power consumption"? The tables are quite clear that it uses 40-70Watts MORE under load then the 5770.

    And indeed, there is something called and NDA.
    Reply
  • Phate-13 - Monday, July 12, 2010 - link

    **** this. I want to be able to edit my posts.

    'something called AN NDA.'
    Reply
  • Death666Angel - Thursday, July 15, 2010 - link

    This is a review site, not a news or rumours site. If you are interested in the what the next couple of months bring from companies like Intel, AMD and nVidia, you need to start using sites like Fudzilla, that report hardware news and rumours.

    And trust me, there was plenty of information on the 460 being in the making and probably outperforming the 465 at a lower price point. :)

    And if you regret the purchase of a 9 month old card because one that just got released has higher performance (20%-40%?), while using more electricity (20%), costs more (60% - 130€ to 210€ for the cheapest cards each), you are going to be a very sad PC buyer, because normally, a new product will be faster _and_ cheaper, while now it is just faster, but a hellovalot more expensive too. :-)
    Reply
  • Lord 666 - Monday, July 12, 2010 - link

    Definitely some details missing for a complete picture on this card. Reply
  • Lonyo - Monday, July 12, 2010 - link

    There's more too.

    No real discussion of the reduction in polymorph engine to shader ratio, such as tessellation benchmarks (synthetic or otherwise).
    Nothing on minimum frame rates (and anything which is put up uses the older 10.3 drivers for ATI).
    In addition to the general compute performance benchmarks that you mention.

    Nothing about CUDA games (e.g. Just Cause 2) comparing the GTX465 to the GTX460.
    No consideration of ROP vs memory changes (i.e. is it memory bandwidth limited or is it purely the ROP reduction causing the performance hit on the 768MB card).

    Maybe the cards didn't come out in time. Maybe everything, or more stuff at least, will be covered in Pt 2, but it is somewhat disappointing that so many things are totally missing.
    Reply
  • Ryan Smith - Monday, July 12, 2010 - link

    You hit the nail on the head with your comment on time. I actually have the data, but with the limited amount of time I had I wasn't able to write the analysis (most of my time was spent on better covering the architecture). That will be amended to the article later today, but for now you can see the raw graphs.

    http://images.anandtech.com/graphs/gtx460_07111017...
    http://images.anandtech.com/graphs/gtx460_07111017...
    http://images.anandtech.com/graphs/gtx460_07111017...
    http://images.anandtech.com/graphs/gtx460_07111017...
    Reply
  • Lonyo - Monday, July 12, 2010 - link

    I hope I didn't come off as too harsh. I started writing and then towards the end realised it could be a time thing, and didn't go back to amend what I had written.
    After looking at most other sites, their reviews are sometimes even worse, covering only a very small handful of games.

    Thanks for the early graphs, much appreciated. Shame NV didn't give more time for proper reviews.
    Reply
  • jonny30 - Monday, July 12, 2010 - link

    - maybe in your country my dear friend.......maybe there i tell you ;)
    - in my country is 300 you see.......300 as a price start i mean :)
    - and for those 100 extra i buy another hdd for example, not another video card if you know what i mean
    - so, maybe is worth for you, but for me to jump from 4870 to this......
    - i am sorry, but it is not wort it........
    Reply

Log in

Don't have an account? Sign up now