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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Lennie - Wednesday, November 18, 2009 - link
If so, then one could suspect it's the same issue with games due to VRMs of this particular card getting heated up and throttling the card. Perhaps not enough contact between VRM and HSF or a complete lack of TIM on VRM by accident. I would have reseated the HSF if I owned that card.Rajinder Gill - Wednesday, November 18, 2009 - link
I suspect it is VRM/heat related. The 'biggest' slaves Volterra currently supply are rated at 45 amps each afaik. Assuming ATI used the 45 amp slaves (which they must have), you've got around 135 amps on tap. Do the math for OCP or any related throttling effects kicking in. Essentially, 1.10VGPU puts you at 150w per GPU before things either shut down or need to be throttled (depends on how it's implemented as it nears peak). Any which way you look at it, ATI have used a high end VRM solution, but 4 slaves per GPU would have given a bit more leeway on some cards. I wonder what the variance is in terms of leakage from card to card as well. Seeing as there's not much current overhead in the VRM (or at least there does not appear to be), a small change in leakage would be enough to stop some cards from doing too much in terms of overclocking on the stock cooler.later
Raja
Silverforce11 - Wednesday, November 18, 2009 - link
It could be your PSU, some "single rail" PSU arent in fact using a single rail but several rails with a max limit on AMPs. Its deceptive.Guru3D uses 1200W PSU and manages 900 core, which is typically what a 5870 OC to on air. Essentially the chips are higher quality cypress, maybe you should retry it again with a different PSU then conclusions can be drawn.
Bolas - Wednesday, November 18, 2009 - link
Yep, there is certainly a market for 5970CF. Can't wait!tajmahal - Wednesday, November 18, 2009 - link
Big deal, another paper launch where only a tiny handful of people will be able to get one.LedHed - Tuesday, November 24, 2009 - link
My question is why do the OC the 5970 but not the 295...We all know the 295 is memory bottlenecked at resolutions at/over 2560x1600
But considering the GTX 295 is down below $450 and no one can find these cards in stock with a god awful price of $600 ($100 more than 295 at launch).
mschira - Wednesday, November 18, 2009 - link
newegg list 5 different models, they come and go quite fast.I managed to get one of them in my shopping card.
All it would need now is pay. (which I don't want to...).
So yea they are not exactly easy to get, but far from impossible.
So not a paper launch.
Be real, it's day two after the launch, and you CAN get them. That's not bad at all.
M.
MrPickins - Wednesday, November 18, 2009 - link
At the moment, Newegg shows two different 5970's in stock. A HIS and a Powercolor.tajmahal - Wednesday, November 18, 2009 - link
Listed, but not available. I guess newegg sold both of the ones they had available, and the 5850 and 5870 ?......... not available either.Silverforce11 - Wednesday, November 18, 2009 - link
Plenty of 5870s around at retails and etailers, what do you mean by "another paper launch"?