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[Anand] HD5970: VRM Heat Limitation?

3721 Views 50 Replies 30 Participants Last post by  ReignsOfPower
http://anandtech.com/weblog/showpost.aspx?i=657

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In our Radeon HD 5970 review, we ran in to some issues when trying to overclock the card to 5870 speeds of 850MHz/1200MHz. At the time this is something we attributed to the VRMs, meanwhile AMD suggested that it was cooling related, and that we should manually increase the fan speed.

As it turns out, we were both right, we just didn’t have the tools at the time to properly identify and isolate the issue. Late last week we got our hands on a beta version of Everest Ultimate, which added preliminary support for the 5970. With that, we could read and log the voltages and temperatures of the various components of the 5970, and properly isolate the issue.
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Lovely.

You would think that they would have learned from the 4870 and all the VRM issues it had, quite a shame.
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sigh.......


its down to voltage regulation then, so you can bet they'll release a ''HD5970 V2'' not far down the road with uprated VRMs


so, was it planned to squeeze customers for a better revision of the card, or a genuine error on ATI's part..??

i tend to think its NOT the latter.....
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Wow most people who bought them are getting decent results

i'm sure this is down to ES samples.
This is the same story as the 5970 OC Problems thread, isn't it?
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Quote:


Originally Posted by kylzer
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Wow most people who bought them are getting decent results

i'm sure this is down to ES samples.

It's more of a heatsink design issue... Do watercoolers with VRM cooling get higher overclocks on average?

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Originally Posted by MrDeodorant
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This is the same story as the 5970 OC Problems thread, isn't it?

Does that article mention why its occuring?
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I just have to ask why OC something that powerful. Nearly all modern games have a FPS cap, and how cares about benchmarks. That said it is not worth braking a 600+ dollar card.
That article says that the 5970 throttles down when it gets too hot, and says that it's a hardware version of throttling that the 4870 did when certain software was detected. Or something.

Edit: you're correct, this is a significantly different story about a related topic.
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Quote:


Originally Posted by MrDeodorant
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That article says that the 5970 throttles down when it gets too hot, and says that it's a hardware version of throttling that the 4870 did when certain software was detected. Or something.

The 4870 would cause my games to crash when the VRM's overheated. ATI wrote it into their drivers that if Furmark was detected as running, it would throttle down the card (or something like that). The effect was that it wouldn't toast the VRM's as easily. They claim it was an unrealistic test and shouldn't be run, while many (my self included) believe that the card should handle what software you are throwing at it, and be built accordingly.

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Originally Posted by Villainstone
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I just have to ask why OC something that powerful. Nearly all modern games have a FPS cap, and how cares about benchmarks. That said it is not worth braking a 600+ dollar card.

It is a hobby. The overclocking is "free" performance, and can get the worlds most powerful card even faster. It is really addicting too, you probably won't be doing this for real performance issues (running only 40FPS and your trying to get higher), but its more of a mental thing "I can get this even faster!".
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Quote:


Originally Posted by Villainstone
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I just have to ask why OC something that powerful. Nearly all modern games have a FPS cap, and how cares about benchmarks. That said it is not worth braking a 600+ dollar card.

Min FPS for many games on a 5970 can still get pretty low. If a decent OC means another 3-5 FPS during those lows, it's worth it to many.

Maxed out Crysis or STALKER will bring even a 5970 to it's knees.
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Quote:


Originally Posted by Villainstone
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I just have to ask why OC something that powerful. Nearly all modern games have a FPS cap, and how cares about benchmarks. That said it is not worth braking a 600+ dollar card.

Say that on 2560x1600 running at x32AA, x16AF.


Quote:


Originally Posted by MrDeodorant
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That article says that the 5970 throttles down when it gets too hot, and says that it's a hardware version of throttling that the 4870 did when certain software was detected. Or something.

Does it is say which component that gets too hot?
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Definite ATI fail on that one. I can't believe the VRM cooling is that bad on the 5970 that it needs to downclock the gpu's under heavy load. Then again the 4890 shuts down as soon as VRM temps break 120c, so a downclock doesn't look too bad compared to that.

So I guess I'll keep waiting on Fermi and whatever mystical gpu revision ATI are rumoured to be working on in response.
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Originally Posted by DuckieHo
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Does it is say which component that gets too hot?

I've already acknowledged my mistake. The other story is about the throttling, and links to Anandtech, which is what confused me, but it's the review where they noticed the throttling that got linked to, not the later post where they explain it.
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Hello ATI, do any in house testing?

I'm confident I can keep one within temp thresholds, but I'm sure many people cannot.
Hmm...I nearly crashed while playing Borderlands a couple times, and I noticed in the comment section of the article that someone mentioned overheating. Kind of troubling...it's one thing to overheat in Furmark, but quite another in real-life apps.

Are there any current aftermarket coolers that will work well on 57xx or 58xx?
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Quote:


Originally Posted by grunion
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Hello ATI, do any in house testing?

I'm confident I can keep one within temp thresholds, but I'm sure many people cannot.

I agree. I have not had an issue with my 5850, even with the card overclocked (900/1100) and running Crysis, but this is something that ATI should have caught.

Now, just imagine the impact this would have if Fermi would have been released on time. Makes you think that ATI lucked out again.
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On a side note, I noticed my 4870x2's VRM temps were hitting 105c as well. Would explain a lot of my crashes after playing MW2 for extended periods of time (only game that uses both GPU's at 99% for me, meaning no CPU limitation).
Nearly the same reason why I didn't like my X1900GT and X1950Pro a few years ago.
Exactly why if you get a dual GPU card it should be underwater to keep those temps in check.
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