Sapphire HD4770

Gaming on a budget
Author: Toni 'HaoKi' Siik
Published: 08.07.2009
Manufacturer: Sapphire
Product Group: GFX Card
In English In English
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Sapphire HD4770

The heatsink seems to be anodized aluminum, which should lower the costs of the card somewhat. The heatsink consists of a basic "flower"-design where the fins of the heatsink radiate away from the solid center. Here the fins are high enough to surround the fan completely.

On top of the fins they've also added a decorative plate which has some ATI and Radeon logos on it. In addition to improving the looks of the heatsink, it also should help guide the airflow through the fins.



Sapphire HD4770

Now that we've gotten to see the card with some detail in general, we can tear up the card so we get to see the RV740-core itself. Disassembling this card was a walk in the park, after having to fiddle around with the dual-PCB structure of the 295GTX from Nvidia.

Here you only have to unscrew four small screws to take the heatsink off. One surprising feature of the heatsink was also revealed after it was taken off. A thin plastic film which covers the base of the heatsink, where it is not in contact with the core. Seems like they wanted to be sure that nothing shorts-out with the heatsink.


Sapphire HD4770

Here's the RV740 in all its glory, surrounded by all of the Qimonda IDGV51-05A1F1C . 40X chips, which are rated at 4.0 Gbps.

Overclocking and Temperatures

Being manufactured with the newer 40nm technology, I was anxious to see how far this card really can stretch. This time I actually had to fiddle around with the overclocking programs, as none of them supported the RV740 officially at the time when the benchmarks were run. After trying a few programs out, I finally ended up with modifying the newest version of Rivatuner at the time, which could overclock the card with better stability than the others which were tried out.


Sapphire HD4770

Sure enough the card overclocked fairly nicely, as the core was stable up to 888 MHz, which is a nice 18.4 % overclock. The memory also had some potential in them as they could be overclocked up to 3920 MHz from their stock 3200 MHz (22.5 % overclock).

I was fairly interested in how well the simple heatsink could cope with the heat generated by the GPU-core. The original RV7xx-series cores were notorious for their high temperatures, but the RV740, with the help from the 40 nm technology seems to have gotten this into reasonable levels. With the ambient temperature around 22 °C at the time of testing, the card idled at 40 °C and topped out at 61 °C, while running at stock frequencies. After overclocking the card, the idle temperature remained pretty much the same, but the top temperatures went up to 67 °C.

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