To help us provide you with free impartial advice, we may earn a commission if you buy through links on our site. Learn more

Asus Radeon HD 7790 DirectCU II OC review

Our Rating :
Price when reviewed : £141
inc VAT

An excellent graphics card, but it’s not quite as good value as Sapphire’s version

Just like Sapphire’s Best Buy-winning implementation of the new AMD Radeon HD 7790 GPU, the Radeon HD 7790 Dual-X OC, the Asus Radeon HD 7790 DirectCU II OC is intended to plug the gap between lower-end cards such as the Radeon HD 7770 and mid-range cards such as the Radeon HD 7850. The Radeon HD 7990 GPU is a 28nm process that provides 896 stream processors, a 128-bit memory interface and up to 96GB/s of memory bandwidth, although the Asus Radeon HD 7790 DirectCU II OC only provides 60GB/s. For comparison, the Radeon HD 7770 has 640 cores and the Radeon HD 7850 has 1024, so the Radeon HD 7790 really is placed neatly in the middle.

It also has a similar specification, with a GPU clock speed of 1.08MHz and 1GB of GDDR5 memory running at 1.6GHz, both of which are an increase on the reference card’s clock speeds of 1GHz and 1.6GHz respectively. It’s also cooled by two fans, just like the Sapphire version and has one 6-pin PCI-E power connector. One difference between the Sapphire and Asus cards is the maximum memory bandwidth available, with the Asus model providing 60GB/s, which is slightly less than the Sapphire’s 64GB/s.

Asus Radeon HD 7790 DirectCU II OC

The Asus Radeon HD 7790 DirectCU II OC’s retail package is less generous than that of the Sapphire Radeon HD 7790 Dual-X OC, as it only contains a DVI-to-VGA adaptor and a CrossFire connector. The Sapphire also provides a HDMI lead and a Molex-to-6-pin power adaptor in addition to those items.

Its 215mm length means it should easily fit in many desktop cases, and it provides two DVI, one HDMI and one DisplayPort output. These outputs, combined with the included DVI-to-VGA adaptor allow a good deal of flexibility when connecting your displays. If you’re lucky enough to have a few spare displays, you can connect up to four of them to the card.

Asus Radeon HD 7790 DirectCU II OC


In keeping with tradition, our first benchmark test involved Dirt Showdown running at a resolution of 1,920×1,080 with 4x anti-aliasing and quality options set to Ultra. Just like the Sapphire HD 7790, the Asus Radeon HD 7790 DirectCU II OC didn’t disappoint, providing a smooth average frame rate of 57.6fps. This is ever-so-slightly higher than that provided by the Sapphire Radeon HD 7790 Dual-X OC, which returned an average frame rate of 55.3fps. It’s also faster than our reference Radeon HD 7770, which scored 40fps in the same test.

When we dropped the resolution to 1,280,×720 and set the graphical quality options to High, the frame rate leapt up to an average frame rate of 106.6fps. The Sapphire version scored 106fps exactly, which is so close you can regard it as the same result.

Next, we ran our more challenging Crysis 2 benchmark at a resolution of 1,920×1,080 at Ultra quality and saw an average frame rate of 24.4fps. Although this is a pass, it’s still too jerky for smooth, comfortable play. Thankfully, we had only had to lower the quality settings one level to Extreme to see an average frame rate of 37fps. This is much more comfortable, but dropping the quality settings to Very High achieved an even higher frame rate of 43.6fps.

This compares well with the Sapphire Radeon HD 7790 Dual-X OC, which, at a resolution of 1,920×1,080, provided average frame rates of 24.6fps at UItra quality, 36.6fps at Extreme quality and 46.3fps at Very High quality. Again, this is so close as to be read as exactly the same result.

If you don’t mind playing Crysis 2 at a lower resolution of 1,280×720, you’ll experience smooth frame rates at Ultra quality from the start. Under these conditions, we saw an average frame rate of 48.4fps.

Pages: 1 2

Basic Specifications

Price £141
Rating *****
Award Best Buy
Interface PCI Express x16 3.0
Crossfire/SLI CrossFire
Slots taken up 2
Brand AMD
Graphics Processor AMD Radeon HD 7790
Memory 1,024MB GDDR5
Memory interface 128-bit
GPU clock speed 1.08GHz
Memory speed 1.60GHz
Card length 215mm


Architecture 896 stream processors
Anti aliasing 8x
Anisotropic filtering 16x


DVI outputs 2
VGA outputs 0
S-video output no
S-Video input no
Composite outputs no
Composite inputs no
Component outputs no
HDMI outputs 1
Power leads required 1x 6-pin PCI Express


Accessories DVI to VGA adaptor, CrossFire connector
Software included none

Buying Information

Warranty three years RTB
Price £141

Read more