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PCB Design

Unlike the reference Radeon HD 4870, the HIS Radeon HD 4870 IceQ 4+ Turbo has a sea-green PCB. Its face side is covered by the cooler:

The reverse side is open for viewing:

The card measures 244 x 100 x 35mm, exactly like the reference sample. As a result, the cooling system will block the neighboring PCI slot on the mainboard. This is not a serious problem, however, because all modern top-end graphics cards come with dual-slot coolers.

The HIS Radeon HD 4870 IceQ 4+ Turbo is equipped with a PCI Express x16 version 2.0 interface, two dual-link DVI-I ports with support for high resolutions, and an S-Video output.

Unlike the reference Radeon HD 4870, this card has gold-plated DVI connectors to minimize electromagnetic interference.

Having removed the cooler, I found that this card uses a reference PCB, the color of the textolite being the single difference.

There are two 6-pin connectors for additional power on the PCB:

According to its specs, the Radeon HD 4870 512MB consumes up to 170 watts of power. A 500W power supply is recommended for a computer with it. A 600W or higher power supply is recommended for an appropriate CrossFire configuration.

Underneath the cooler and a thick layer of gray thermal grease there is an RV770 processor manufactured in Taiwan in early September (37th week of 2008).

The die is 256 sq. mm large, incorporating about 956 million transistors. The GPU has 800 unified shader processors, 40 texture-mapping units and 16 raster back-ends. The GPU frequency of the card is 770MHz, which is 20MHz (6.7%) higher than the reference GPU frequency.

The HIS Radeon HD 4870 IceQ 4+ Turbo has two times as much memory as the reference Radeon HD 4870, i.e. 1024 megabytes. Its eight GDDR5 memory chips were manufactured by Qimonda on the 40th week of 2008.

These revision A1 chips are marked as IDGV1G-05A1F1C-40X. They have an access time of 1.0 nanosecond and a rated frequency of 4000MHz. This is indeed the frequency the memory is clocked at by the card (200MHz or 5.3% higher than the memory frequency of the reference HD 4870).

Thus, the HIS Radeon HD 4870 IceQ 4+ Turbo comes with a double amount of graphics memory and slightly pre-overclocked frequencies.

 
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