We already tested the power consumption of the HD68-series cards in the original
Barts-review and the HIS-versions of the cards don't differ significantly from those
numbers. Depending on the clock speeds the HD6850's consume around the same amount of
power as the HD5850 and the HD6870 is about 30 watts hungrier than the HD6850. To see
how well the IceQ X cooler works and fills the claims, we also tested the core
temperatures under idle and load, and indeed under load the IceQ X HD6850 remained a
massive 29°C colder than the reference HD6850 (61°C vs 80°C). It also did
this while being a bit quieter than the reference cooler, so the temperature improvement
was genuine rather than a result of more powerful fan.
The HIS HD6870 Turbo is an overclocked version of the HD6870, but other than the
slightly higher stock clock speeds, it's the reference design inside and out. Thus also
the performance, power consumption and noise are exactly what se saw on the original
review.
Unlike the HD6870, both the HD6850's come with a modified PCB layout and also special
coolers, which differ them from cards by other brands. The enhanced coolers are a nice
touch and really add to the value of these cards even as stock, but they really come to
their own when the clock speeds are pushed up, as the core temperatures of these cards
still remained good despite the clock speeds of over a 1000 MHz. So both HD6850's proved
to be solid performers and can be recommended especially for overclockers.
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