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In English
SuomeksiCooling
Now here we have the cooler of the HD5770 stripped off the card. As we can see the cooler consists of two main parts. The part with plastic shell, heatsink for the core and the fan and the second part which both keeps the card straight and cools the memory chips which are placed the front-side of the card.
The plastic-shell of the card is a bit different than we're used to seeing. The shell has multiple channels which direct the airflow into the desired direction. The holes under the fan should give some airflow to keep the power-circuitry cool enough.
Although the bottom of the heatsink may look dented and crude, it actually is a nice step-up from the older versions. This time around AMD seems to have opted for a heatsink in which the whole bottom consists of a heatplate, or basically just a wide and flat heatpipe. This should help dissipate the heat from the core.
Here's closer look of the heatsink which should keep the core-temperatures in check.
Overclocking and Temperatures
Like the previously reviewed HD4770, the HD5770 core has also been manufactured with the newer 40nm technology at TSMC. This should keep the power-consumption in check while keeping the card running cool. One of the major improvements which AMD has brought to the power-consumption, is the fact that the new HD5K-cards really do power-down while idling. This means that the idle-temperatures have dropped considerably and at the end of the day, it may save you a few pennies and maybe even save the plant from global-warming... Or maybe not. Still not a bad thing though.
As this card is still brand new, we used the newest revision the AMD GPU Clock Tool to help us find the limits of this card.
Overclocking this card was hard work, as I had no idea on how far it would stretch. After fiddling around with the settings for some time, I found 970 MHz to be around the maximum, we could squeeze from the core, without adding any fan-speed. The memories stretched all the way to 1270 MHz, which is effectively 5080 MHz. I am confident that, especially the memory-clocks could be improved by adding a little bit of cooling.
The power-saving features became quickly evident while looking at the temperatures. While the last-generation AMD-cards saw idle-temperatures of almost 80°C, this little bugger sat nicely at around 45°C. Once stressed, the temperatures went up to a tolerable 69°C. After overclocking the card, the only major difference was the raised idle-temperature, which rose to around 53°C at our lab.
The power-consumption of the whole system while idling was 160 W and while looping a instance of 3DMark Vantage the consumption went up till 238 W.
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