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Sapphire Radeon HD 7790 Dual-X OC review

Our Rating :
Price when reviewed : £128
inc VAT

A good mid-range card for 1080p gaming, it plays the latest games in high detail settings at smooth frame rates

The Sapphire Radeon HD 7790 Dual-X OC is a factory-overclocked version of the AMD Radeon HD 7790, a new graphics card that plugs the gap between the £100 AMD Radeon HD 7770 and the £140 AMD Radeon HD 7850.

It’s more than a simple overclock or downclock of either of those cards though, using instead the brand new Bonaire GPU. With features that relate it closely to the hardware in upcoming next-gen consoles, the new GPU has more shader cores and texture units than the current HD 7770.

The GPU is a 28nm process with 896 stream processors. AMD’s reference core clock speed is 1GHz, but Sapphire has raised the clock speed of this version to 1.08GHz for a gentle performance boost. The card’s 1GB of GDDR5 RAM has also been overclocked to 1.6GHz from the reference 1.5GHz. Should you want to increase the memory and core clocks further, you can use the Trixx Utility that comes with the Radeon HD 7790 Dual-X OC.

Sapphire Radeon HD 7790 Dual-X OC

The retail package includes everything you need to install the card, including to a Molex to 6-pin PCI-E power connector should your power supply not have a free PCI-E power connector. It also comes with a DVI-to-VGA adaptor, a CrossFire connector and a HDMI cable. You may not need all of these, but it’s good to have spare adaptors and everyone can make use of a spare HDMI cable. As for connections, the Radeon HD 7790 Dual-X OC has one HDMI, one DisplayPort and two DVI outputs. These outputs, together with the DVI-to-VGA adaptor, give you a great deal of flexibility when connecting your displays.

Sapphire Radeon HD 7790 Dual-X OC
There’s all the ports you’ll need for hooking up displays

Initially, we tested the card with Dirt Showdown and at a resolution of 1,920×1,080 with 4x anti-aliasing and quality options set to Ultra, the card achieved a very smooth average frame rate of 55.3fps. With the resolution reduced to 1,280×720 and quality options set to High, the average frame rate leapt to 106fps. These frame rates are fantastic for a graphics card at this price, and compare well to the Radeon HD 7770-based, sub-£100 XFX R7770 Core Edition, which produced frame rates of 40fps and 97fps in those tests respectively.

In our more challenging Crysis 2 benchmark test, the Sapphire Radeon HD 7790 Dual-X OC produced an average frame rate of 24.6fps at a resolution of 1,920×1,080 with 4x anti-aliasing and quality options set to Ultra. This isn’t smooth enough for comfortable play, but dropping the quality options to Extreme produces a fairly smooth average frame rate of 36.6fps. Further reducing the quality to Very High produces an eye-pleasing average frame rate of 46.3fps.

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Basic Specifications

Price £128
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, Molex to 6-pin power adaptor, CrossFire connector, HDMI lead
Software included none

Buying Information

Warranty one year RTB
Price £128

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