The Radeon HD 5970: Completing AMD's Takeover of the High End GPU Market
by Ryan Smith on November 18, 2009 12:00 AM EST- Posted in
- GPUs
Thanks to AMD’s aggressive power optimizations, the idle power of the 5970 is rated for 42W. In practice this puts it within spitting distance of the 5800 series in Crossfire, and below a number of other cards including the GTX 295, 4870X2, and even the 4870 itself.
Once we start looking at load power, we find our interesting story. Remember that the 5970 is specifically built and binned in order to meet the 300W cap. As a result it offers 5850CF performance, but at 21W lower power usage, and the gap only increases as you move up the chart with more powerful cards in SLI/CF mode. The converse of this is that it flirts with the cap more than our GTX 295, and as a result comes in 69W higher. But since we’re using OCCT, any driver throttling needs to be taken in to consideration.
Looking at the 5970 when it’s overclocked, it becomes readily apparently why a good power supply is necessary. For that 15% increase in core speed and 20% increase in memory speed, we pay a penalty of 113W! This puts it in league with the GTX series in SLI, and the 5870CF, except that it’s drawing all of this power over half as many plugs. We’re only going to say this one more time: if you’re going to overclock the 5970, you must have a very good power supply.
Moving on, the vapor chamber cooler makes itself felt in our temperature testing. The 5970 is the coolest high-end card we’ve tested (yes, you’ve read that right), coming in at 38C, below even the GTS 250. This is in stark opposition to previous dual-GPU cards, which have inhabited the top of the chart. Even the 5850 isn’t quite as cool as a 5970 at idle.
At load, we see a similar but slightly different story. It’s no longer the coolest card, losing out to the likes of the 5850 and GTX 285, but at 85C it hangs with the GTX 275, and below other single and dual-GPU cards such as the 5870 and GTX 295. This is a combination of the vapor cooler, and the fact that AMD slapped an oversized cooler on this card for overclocking purposes. Although Anand’s card failed at OCCT when overclocked, my own card hit 93C here, so assume that this cool advantage erodes under overclocking.
Finally we have our look at noise. Realistically, every card runs up against the noise floor, and the 5970 is no different. At 38C idle, it can keep its fan at very low speeds.
It’s at load that we find another interesting story. At 63.8dB it’s plenty loud, but it’s still quieter than either the GTX 295 or 5870CF, the former of which it is significantly faster than. Given the power numbers we saw earlier, we had been expecting something that registered as louder, so this was a pleasant surprise.
We will add that on a subjective basis, AMD seems to have done something to keep the whine down. The GTX 295 (and 4870X2) aren’t just loud, but they have a slight whine to them – the 5970 does not. This means that it’s not just a bit quieter to sound meters, but it really comes across that way to human ears too. But by the same token, I would consider the 5850CF to quieter still, more so than 2dB would imply.
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Ryan Smith - Wednesday, November 18, 2009 - link
It's possible, but the 850TX is a very well regarded unit. If it can't run a 5970 overclocked, then I surmise that a lot of buyers are going to run in to the same problem. I don't have another comparable power supply on hand, so this isn't something I can test with my card.Anand has a 1K unit, and of course you know how his turned out.
To be frank, we likely would have never noticed the throttling issue if it wasn't for the Distributed.net client. It's only after realizing that it was underperforming by about 10-20% that I decided to watch the Overdrive pane and saw it bouncing around. These guys could be throttling too, and just not realize it.
Silverforce11 - Wednesday, November 18, 2009 - link
Seems iffy then since most reviews put it at 900 core and 5ghz + on the ram, with only a modest overvolt to 1.16. I would think ATI wouldnt bother putting in 3 high quality VRM and japanese capacitors if they didnt test it thoroughly at the specs they wanted it to OC at.My old PSU is the bigger bro of this guy being the 750 ver.
http://anandtech.com/casecoolingpsus/showdoc.aspx?...">http://anandtech.com/casecoolingpsus/showdoc.aspx?...
And had issues with the 4870x2. Got a better "single rail" PSU and it ran fine n OC well.
Silverforce11 - Wednesday, November 18, 2009 - link
ATI went all out with building these 5970, the components are top notch. The chips are the best of the bunch. I'm surprised they did this, as they are essentially selling you 2x 5870 performance (IF your PSU is good) at $599 when 2x 5870 CF would cost $800. They have no competitor in the top, why do they not price this card higher or why even bother putting in quality parts to almost guarantee 5870 clocks?I believe its ATI's last nail on the nV coffin and they hammered it really hard.
ET - Wednesday, November 18, 2009 - link
Too much discussion about adapters for the mini-displayport. The 27" iMac has such an input port and a resolution of 2560 x 1440, and it seems a sin to not test them together. (Not that I'm blaming Anandtech or anything, since I'm sure it's not that easy to get the iMac for testing.)Taft12 - Wednesday, November 18, 2009 - link
Why would they bother using a computer with attached monitor and instead use the larger, higher-res and CHEAPER Dell 3008WFP?Raqia - Wednesday, November 18, 2009 - link
Look at all the finger print smudges on the nice card! I've started to notice the hand models that corporations use to hold their products. The hands holding the ipods on the apple site? Flawless, perfect nails and cuticles. Same w/ the fingers grasping the Magny Cours chip.NullSubroutine - Wednesday, November 18, 2009 - link
Hilbert @ Guru3d got the overclocking working with 900Mhz core speed (though it reached 90c).http://www.guru3d.com/article/radeon-hd-5970-revie...">http://www.guru3d.com/article/radeon-hd-5970-revie...
I was impressed with some of the crossfire benchmarks actually showing improvement. If Eyeinfinity works with 5970 does it work with the card in crossfire?
Ryan Smith - Wednesday, November 18, 2009 - link
Bear in mind that it also took him 1.3v to get there; the AMD tool doesn't go that high. With my card, I strongly suspect the issue is the VRMs, so more voltage wouldn't help.And I'm still trying to get an answer to the Eyefinity + 5970CF question. The boys and girls at AMD went home for the night before we realized we didn't have an answer to that.
Lennie - Wednesday, November 18, 2009 - link
I thought everyone knew about Furmark and ATi by now. It used to be like this on 4870 series too.It went like this, at first there were few reports of 4870(X2) cards dying when running Furmak. Further investigation showed that it was indeed Furmark causing VRM's to heat up to insane levels and eventually killing them. Word reached ATi from that point on ATi intentionally throttles their card when detecting Furmark to prevent the damage.
Yeah in fact the amount of heat load Furmak puts on VRMs is unrealistic and no game is able to heat up the VRMs to the level Furmark does. OCCT used the same method (or maybe even integrated Furmark) to test for stability (in their own opinion ofc)
So beware about Furmark and OCCT if you have HD4K or 5K.
The term "Hardware Virus" is rightfully applicable to Furmark when it comes to HD4K (and 5K perhaps)
strikeback03 - Wednesday, November 18, 2009 - link
The article stated that they encountered throttling in real games, not Furmark.