That's really curious thing - some put it being louder than HD4870X2 and what not, but then other sites are saying it's the most silent reference cooler ever
HD 5870 first impressions
- Thread starter Voxilla
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That's really curious thing - some put it being louder than HD4870X2 and what not, but then other sites are saying it's the most silent reference cooler ever
The air coming out of the 5870 isn't even warm. Even putting my fingers to the back of the Gpu, I can barely feel any warmth. Is this thing on?
You can see why that is in the Control Center under Overdrive.
At idle and 2D desktop the GPU and memory are downclocked from 850Mhz / 1200 Mhz to 157 Mhz / 300 Mhz.
That's really curious thing - some put it being louder than HD4870X2 and what not, but then other sites are saying it's the most silent reference cooler ever
My impression is that HD5870 is less noticeable than HD4870 I had before.
Silent_Buddha
Legend
That's really curious thing - some put it being louder than HD4870X2 and what not, but then other sites are saying it's the most silent reference cooler ever
Easily explained.
Those that like to "play" furmark report high noise levels.
Those that actually test in real applications and games report low noise levels. With regards to mine, it's quieter in games than either my 4870/512 or 4890. At least it's less noticeable. My PSU right now is the biggest noise generator, and it's a relatively quiet PSU. But going to replace it with a quieter one. It's over 4 years old now after all.
And finally sold my 4870. Heh, glad people still like getting deals on older hardware.
Regards,
SB
It's less noticeable than my 4870 or 4890.
Not yet! First I must put my computer back to new bigger case
Going back to card loudness I've noticed that some models are using 1.125V for GPU under load (like mine Shappire) and other are using 1.165V under load. This might explain quite big variations between different reviews in power consumption tests under load ...
Actually, it does the opposite! We scale the voltage based on leakage, so the higher leakage parts use lower voltage and the lower leakage parts use a higher voltage - what this is does narrow the entire TDP range of the product.
Everything is qualified at worst case anyway; all the TDP calcs and the fan settings are completed on the wors case for the product range.
I guess so, but they would overclock higher.
Power is the product of current (including leakage) and voltage if I remember well.
Maybe the higher voltage enables more overclocking or better reliability...
No, the nominal voltage is 1.165V, however the higher leakage parts do not need as much voltage to run at those speeds.
I'm not sure lower leakage means better part. If the lower leakage is due to thicker gate insulator, then the transistors might switch slower, and they'll actually need higher voltage to reach the same speed.
What Dave is trying to say is that higher leakage parts needs less volts to reach target freq. In other words higher leakage = higher clocks at a cost of higher power consumption. It's like with AMD Phenom II TWKR edition, it is a very high leakage part, but it takes cold well and clocks exceptionally!
So I'm paying a bit more from electricity thanks to my card, but I'm hitting 1GHz core FurMark stable at only 1.18V
Lower leakage wastes less electricity under same conditions (like 850MHz @1V) and also in power saving mode (but PP gating is so good on RV8xx that it probably makes really small difference anyway).
BTW thank you Dave for clearing that up!
So I'm paying a bit more from electricity thanks to my card, but I'm hitting 1GHz core FurMark stable at only 1.18V
Lower leakage wastes less electricity under same conditions (like 850MHz @1V) and also in power saving mode (but PP gating is so good on RV8xx that it probably makes really small difference anyway).
BTW thank you Dave for clearing that up!
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I've been playing with a 5870 as well and it's quite an impressive card. In addition to just being really fast in normal rendering, the compute shader implementation seems pretty solid already. It's also a really nice way to develop graphics stuff compared to CUDA, etc. IMHO - no (horribly bad) interop penalty, no need to set up additional resource types or copy data, etc. It all just works with the graphics stuff you already have set up.
What Dave is trying to say is that higher leakage parts needs less volts to reach target freq. In other words higher leakage = higher clocks at a cost of higher power consumption. It's like with AMD Phenom II TWKR edition, it is a very high leakage part, but it takes cold well and clocks exceptionally!
So I'm paying a bit more from electricity thanks to my card, but I'm hitting 1GHz core FurMark stable at only 1.18V
Lower leakage wastes less electricity under same conditions (like 850MHz @1V) and also in power saving mode (but PP gating is so good on RV8xx that it probably makes really small difference anyway).
BTW thank you Dave for clearing that up!
OK I guess that makes sense. Thanks for clarifying that!
No you don't get it. Power (P) is the product of current (I) and voltage (V).
So P = V * I.
What Dave says it that they try took keep power consumption the same for all parts. So if there is more current draw because of leakage they reduce voltage to keep the same power consumption for all parts, and hence all parts need similar cooling for similar rendering loads.
Leakage is something bad, with low leakage you can raise the voltage for same power consumption, and higher voltage enables higher clock frequency.
Higher leakage part have thinner insulator layers ... which can run at reduced voltage while meeting the same timing requirements. Now obviously this isn't going to get you back to exactly the same power consumptions with the same timing margins, but you can claw some of the losses back.
Lightman is 100% right the reason the high leakage part has a lower voltage is because they don't need as high a voltage to reach the same clock speed.