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HD4850 IN CLOSER DETAIL
With the heatsink taking up most of the room on the PCB surface and a sticker
covering it, there isn't a whole lot to see.
Visible portion of the PCB.
The most notable feature is an extension of the heatsink jutting
out the cover the voltage regulation modules. An odd set of cylindrical fins
protrude upwards like a large array of silos.
The back panel.
Near the rear of the card, the shroud opens up, providing the main points of
exhaust. There are also four claw-shaped holes on top. The design definitely
has problems what is the point of direct all the exhaust to the rear if
there's no clear exit path? There's no room for ventilation on the back panel
as it is filled with connectors, two DVI and one TV-out port.
From the sides.
There is also a small of the cooler open to the elements section
at the top of the card open to the elements.
Under the hood.
The heatsink is a one-piece solution that cools the GPU, and
with the help of some soft thermal pads, the ramsinks, VRMs, and inductors
as well. The card has the same set of mounting holes as the HD 3850/3870,
so a variety of third party coolers can be utilized if desired, though some
extra hardware may be required for the VRMs and inductors. The core is surrounded
by a shim, which can protect it from accidental damage if you decide to replace the stock
Rear of the heatsink.
Removing the stock cooler made the back more accessable. The
fins are fairly thin and the spacing wide.
The tiny fan.
The fan is manufactured by NKT Technologies. It's a dual ball
bearing fan rated for 0.40A at 12V, or 4.8W, which is quite high for such a tiny fan. At the full 12V input, this fan probably spins at many thousands of RPM and is bound to be very noisy.
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