Gigabyte Radeon HD 7790 OC 2GB (GV-R779OC-2GD)
On the back, you can find descriptions of the cooler and key product features. Included into the box are a power adapter, a software CD, and a brief installation guide:
The graphics card is manufactured in China and costs $170. The warranty period is 3 years.
The Gigabyte Radeon HD 7790 OC is the longest card in this review at 267 mm. With its large dimensions and dual-fan cooler, it doesn’t really look like an entry-level product.
The video outputs are perfectly standard: two DVI ports, one HDMI and one DisplayPort.
There are also no differences from the reference card in terms of CrossFireX and power connectors:
However, the Gigabyte is the only card in this review for which a 450 rather than 500-watt PSU is recommended. Notwithstanding the larger PCB, the card uses the reference design:
Featuring Gigabyte’s Ultra Durable technology, the card employs low-RDS(on) MOSFETs, Japanese solid-state capacitors and ferrite-core chokes. Its power system is governed by an ON Semiconductor NCP81022 controller you can see on the reverse side of the PCB.
The GPU only differs from the ASUS card’s in its date of manufacture (8th week of 2013).
Like with the ASUS card, the GPU frequency is 1075 MHz in 3D applications. The ASIC quality of the chip is somewhat higher at 73.5%.
The Gigabyte has the same memory chips as the ASUS card. There are 8 of them, located on both sides of the PCB:
The difference is in the total amount. Instead of 1 GB, the Gigabyte Radeon HD 7790 OC has 2 GB of onboard memory. The memory is not pre-overclocked and works at 6000 MHz.
The Gigabyte Radeon HD 7790 OC is equipped with a WindForce series cooler which is called Triangle Cool. It is rather simple in design, consisting of an aluminum heatsink with one direct-touch 6mm heat pipe and a plastic casing with two fans.
The fans are 95 mm in diameter. Their speed varies from 1300 to 2600 RPM by means of changing their voltage. In the automatic regulation mode the speed of the fans was no higher than 1800 RPM and the GPU temperature was only 60°C.
Auto fan mode
Maximum fan speed
That’s an excellent result. You can also set the fans at their maximum speed to lower the temperature to 56°C.
The GPU of the Gigabyte Radeon HD 7790 OC could be overclocked by the same 145 MHz as the GPU of the ASUS card but the memory chips did better and accelerated by 880 MHz.
So the Gigabyte card was stable at 1220/6880 MHz.
The overclocked card was 61°C hot, its fans rotating at 1830 RPM.
Thus, despite the seemingly simple design, Gigabyte’s cooler copes with its job just perfectly.