Final Words

As we mentioned towards the start of this review, immediately following the launch of the Radeon R9 290 series and leading up until now there has been a lot of chatter and a lot of questions over the subject of custom 290 series cards. Customized, open air cooled cards is all but obligatory these days, so the fact that we’re now looking at these cards is in and of itself not all that surprising. Even in a more typical launch these cards attract quite a bit of attention due to the various tweaks worked into their designs by board partners and the greater variety of options that come from this process. But the launch of the 290 series has been atypical due to the fact that we don’t normally put this much attention on customized cards or await their arrival quite this eagerly.

We’ve already written a small tome on the reference 290 so we won’t completely rehash that here, but in summary, while AMD had a major hit on their hands with the 290 with respect to pricing and performance this came at the cost of noise. The cooling performance required to hit those performance marks meant that the reference 290 was not as well balanced of a card as we’ve seen in previous launches. For cases where noise wasn’t a concern (both in the literal and figurative sense) this was a fine tradeoff, but in other cases where noise was a concern the reference 290 missed the mark compared to other blowers. Ultimately this has fueled a greater than usual interest in custom cards – and more specifically the open air coolers they’re typically equipped with – as open air coolers offer a better acoustic profile than blowers like the one used in the reference 290.

This brings us to the subject of today’s review and the very first of the custom 290s we’ve seen, Sapphire’s Radeon R9 290 Tri-X OC. The 290 Tri-X OC is just one of what will be many customized designs to be released in the weeks to come, but it represents something much bigger and much more important in the AMD ecosystem: variety. The lack of balance in the AMD reference design has opened up the door to board partners to offer designs that lean the other way, making different tradeoffs to reach different results, and this is the path Sapphire has followed for their 290 Tri-X OC.

Without putting the weight of the entire 290 series on a single card, the 290 Tri-X OC is exactly the 290 card AMD needs to have hit the market to bring that necessary variety to the market. From a performance perspective and an acoustics perspective the 290 Tri-X OC has exceeded our expectations for an open air cooled card, and in the process proves that you can have a quiet 290. A very quiet 290, as it turns out. 41dB(A) under load would already be an impressive result for a high end card, but especially contrasted against the 57dB(A) reference 290 it becomes outright sublime.

And while a large part of these remarkable results has to do with the style of the cooler used, Sapphire deserves a lot of credit for seemingly doing everything right in putting this card together. Even among open air cooled cards the 290 Tri-X OC is well ahead of the pack on acoustics (all the more so when you consider the thermal loads involved) and at the same time Sapphire has hit the mark on build quality and overall performance. We've seen a number of open air designs over the years, but few of them would qualify as being as good as what Sapphire has pulled off for the 290 Tri-X OC.

On that note, while Sapphire’s mild factory overclock doesn’t significantly change the performance equation it does reinforce the 290’s strong points. For $450 the card will consistently outperform the GTX 780 or outright tie the 290X in quiet mode, offering equal-to-better performance than those $500+ cards without the noise drawback that came with the reference 290, making it an even more practical replacement for those cards. Given that, Sapphire is essentially charging $50 for a better cooler, but as we’ve seen from our results they can easily justify it due to the fact that there isn’t anything else on the market right now that can match both their performance and their acoustics at the same time.

With that in mind, for all of our concerns over the reference 290 this is the card that will help put to bed a lot of those concerns. For users who were already happy with the 290 nothing really changes, while for those users on the edge over noise concerns this is the card that can deliver on 290’s performance without the noise, albeit by giving up the benefits of a blower. To that end an open air cooler is not always the right solution – the lack of a blower that can compete with NVIDIA’s will continue to exclude the 290 from some builds – but it’s important that both options are available rather than just a blower or just an open air cooler.

Ultimately it is admittedly something of a narrow focus in recommending a card based on noise, but as far as high performance cards go Sapphire has set a very high bar here that we expect few other cards will be able to meet. Both as a 290 card and as a high performance card in general, Sapphire has managed to put together something special.

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  • ShieTar - Tuesday, December 24, 2013 - link

    "Curiously, the [idle] power consumption of the 290 Tri-X OC is notably lower than the reference 290."

    Well, it runs about 10°C cooler, and silicone does have a negative temperature coefficient of electrical resistance. That 10°C should lead to a resistance increase of a few %, and thus to a lower current of a few %. Here's some nice article about the same phenomenon observed going from a Stock 480 to an Zotac AMP! 480:

    http://www.techpowerup.com/reviews/Zotac/GeForce_G...

    The author over there was also initially very surprised. Apparently kids these days just don't pay attention in physics class anymore ...
  • EarthwormJim - Tuesday, December 24, 2013 - link

    It's mainly the leakage current which decreases as temperature decreases, which can lead to the reductions in power consumption.
  • Ryan Smith - Tuesday, December 24, 2013 - link

    I had considered leakage, but that doesn't explain such a (relatively) massive difference. Hawaii is not a leaky chip, meanwhile if we take the difference at the wall to be entirely due to the GPU (after accounting for PSU efficiency), it's hard to buy that 10C of leakage alone is increasing idle power consumption by one-third.
  • The Von Matrices - Wednesday, December 25, 2013 - link

    In your 290 review you said that the release drivers had a power leak. Could this have been fixed and account for the difference?
  • Samus - Wednesday, December 25, 2013 - link

    Quality vrms and circuitry optimizations will have an impact on power consumption, too. Lots of factors here...
  • madwolfa - Wednesday, December 25, 2013 - link

    This card is based on reference design.
  • RazberyBandit - Friday, December 27, 2013 - link

    And based does not mean an exact copy -- it means similar. Some components (caps, chokes, resistors, etc.) could be upgraded and still fill the bill for the base design. Some components could even be downgraded, yet the card would still fit the definition of "based on AMD reference design."
  • Khenglish - Wednesday, December 25, 2013 - link

    Yes power draw does decrease with temperature, but not because resistance drops. Resistance dropping has zero effect on power draw. Why? Because processors are all about pushing current to charge and discharge wire and gate capacitance. Lower resistance just means that happens faster.

    The real reason power draw drops is due to lower leakage. Leakage current is completely unnecessary and is just wasted power.

    Also an added tidbit. The reason performance increases while temperature decreases is mainly due to the wire resistance dropping, not an improvement in the transistor itself. Lower temperature decreases the number of carriers in a semiconductor but improves carrier mobility. There is a small net benefit to how much current the transistor can pass due to temperature's effect on silicon, but the main improvement is from the resistance of the copper interconnects dropping as temperature drops.
  • Totally - Wednesday, December 25, 2013 - link

    Resistance increases with temperature -> Power draw increases P=(I^2)*R.
  • ShieTar - Thursday, December 26, 2013 - link

    The current isn't stabilized generally, the current is: P=U^2/R.

    " Because processors are all about pushing current to charge and discharge wire and gate capacitance. Lower resistance just means that happens faster."

    Basically correct, nevertheless capacitor charging happens asymptotic, and any IC optimised for speed will not wait for a "full" charge. The design baseline is probably to get the lowest charging required for operation at the highest qualified temperature. Since decreasing temperature will increase charging speed, as you pointed out, you will get to a higher charging ratio, and thus use more power.

    On top of that, the GPU is not exclusively transistors. There is power electronics, there are interconnects, there are caches, and who knows what else (not me). Now when the transistors pull a little more charge due to the higher temperature, and the interconnects which deliver the current have a higher resistance, then you get additional transmission losses. And that's on top of higher leakage rates.

    Of course the equation gets even more fun if you start considering the time constants of the interconnects itself, which have gotten quiet relevant since we got to 32nm structures, hence the high-K materials. Though I have honestly no clue how this contribution is linked to temperature.

    But hey, here's hoping that Ryan will go and investigate the Power drop with his equipment and provide us with a full explanation. As I personally don't own a GPU which gets hot in idle (can't force the fan below 30% by software and won't stop it by hand) I cannot test idle power behavior on my own, but I can and did repeat the Furmark-Test described in the link above, and also see a power-saving of about 0.5W per °C with my GTX660. And thats based on internal power monitoring, so the mainboard/PCIe slot and the PSU should add a bit more to that:

    https://www.dropbox.com/s/javq0dg75u40357/Screensh...

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