Meet The Radeon HD 7790 & Sapphire HD 7790 Dual-X Turbo

Today we’ll be looking at two cards, AMD’s reference card and Sapphire’s customized HD 7790 Dual-X OC. As is typical for cards in this price segment, the designs are relatively simple and as such only a few partners will be using the reference design as opposed to rolling their own designs. At the same time AMD is pushing their partners’ factory overclocked cards hard – we have the Sapphire and then 3 more on their way – but it’s important to keep in mind that not every last 7790 will be factory overclocked. So AMD’s Spartan reference card is a good example of baseline 7790 performance will be like, including how well it performs with a simple, single-fan open air cooler.

As we alluded to a moment ago, AMD’s reference 7790 is a spartan card. At under 7” long it’s actually shorter than the 7770 and has more in common with the 7750 as far as board length goes. Cooling is provided by a small open air cooler, composed of a circular heatsink with copper heatpipes running up from the base of the card and into the heatsink fins. At the center is a single, small fan responsible for providing the airflow for the card. Meanwhile towards the front of the card we find a small upright heatsink, providing the minimal cooling necessary for the MOSFETs regulating power for the card.

As we’re looking at a 128bit card, memory is provided by 4 6GHz Hynix GDDR5 memory modules, placed on the front of the card underneath the heatsink. A lot of AMD’s partners will be shipping their cards with the memory overclocked to 6.4GHz, which is a fairly common overclock for Hynix’s GDDR5 modules these days.

Elsewhere on the card we can see the sole 6pin PCIe power socket, pointing towards the rear of the card. The 7790 does draw more power than the 7770, and while total power consumption is fairly low, it’s still over 75W and hence requires external power. Meanwhile at the top of the card we can see a single CrossFire connector. AMD believes offering CF here when NVIDIA’s closest product doesn’t (the GTX 650 Ti) is a marketable advantage, but CFing a 1GB card in 2013 strikes us as a poor idea.

Finally, for display connectivity AMD has deviated from the rest of the 7000 series a bit. The 7700 and 7800 series used a single row of display connectors, typically composed of an HDMI port, a DL-DVI-I port, and 2 miniDPs. With 7790 however AMD is dropping the miniDPs in favor of one full-size DisplayPort, and at the same time they’re bringing back the stacked DVI connector. 

Taking up space on the 2nd slot of the card’s bracket is a DL-DVI-D port, giving us the first AMD card with two DVI ports in this price range in some time. Note that while Bonaire can drive up to 6 displays it can only drive 2 TMDS-type displays (DVI/HDMI), so the second DVI port can only be used if the HDMI port is not in use.

Radeon HD 7790 Specification Comparison
  Radeon HD 7790 (Ref) Sapphhire HD 7790 OC
Base Clock 1000MHz 1075MHz
Memory Clock 6GHz 6.4GHz
Frame Buffer 1GB 1GB
Width Double Slot Double Slot
Length N/A N/A
Warranty N/A 2 Year
Price Point $149 $159

Meet The Sapphire HD 7790 Dual-X OC

Moving on, we’re also taking a look at a partner card today, Sapphire’s HD 7790 Dual-X OC. Virtually every partner is releasing a factory overclocked card of some kind with their own take on the design, but Sapphire’s 7790 should be a good representation of what to expect given how similar many of the 7790 designs are.

To that end Sapphire’s Dual-X cooler is your fairly standard twin fan design, utilizing a pair of shallow fans mounted over an aluminum heatsink that runs over the length of the card. A pair of copper heatpipes run from the baseplate over the GPU to the heatsink, with the entire solution serving as an open-air cooler. Note that while Sapphire is using AMD’s reference PC design here, they have lengthened their PCB to match the length of their heatsink, and to allow them to turn the PCIe socket 90 degrees so that it now is against the top of the card rather than the rear.

As given away by the OC name, Sapphire will be shipping their card with a decent factory overclock. Shipping speeds will be 1075MHz for the core and 6.4GHz for the memory, a 7.5% core overclock and 6.5% memory overclock respectively. This will be the most common factory overclock, with several other partners shipping their top-end cards with the same overclock.

Other than the custom cooler and factory overclock, Sapphire’s card is otherwise functionally identical to AMD’s reference card. We’re looking at the same display output configuration of 1x DP, 1x HDMI, and 2x DL-DVI, with the same CrossFire capabilities. Sapphire is putting the MSRP of the card at $159, putting a $10 premium on their cooler and factory overclock.

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View All Comments

  • bebimbap - Friday, March 22, 2013 - link

    would it be wrong of me to wait for the 7790 ghz ed? Reply
  • SithSolo1 - Friday, March 22, 2013 - link

    There will be no GE of this card.

    Quote - "The Radeon HD 7790 runs at 1GHz, but is not going to be called a "GHz Edition" anymore. AMD feels that they have made the point about having 1GHz edition GPUs in the market in 2012, and did not feel a need to label this new one a GHz Edition. Therefore, it will just be known as Radeon HD 7790." - Brent @ HardOCP, Asus DCUII 7790 review
  • SithSolo1 - Friday, March 22, 2013 - link

    Before someone gets confused, I'm not Brent. I just happened to read the review a bit ago and remembered that part about the Ghz Edition. Reply
  • Hardcore69 - Friday, March 22, 2013 - link

    Don't see a point. As a PC gamer I want it all, not some laughably compromised card - just over 30FPS (if that) at 1080p with the settings turned up? What's the point, just buy a console. I'll stick with my 680. Reply
  • cyan1d3 - Friday, March 22, 2013 - link

    While I agree with your sentiment, this card was not designed with us in mind, there is a large portion of people on budgets, who can't go ahead and blow ~$450 on a graphics card. There is also a large portion of people who see no need to play games at Ultra with high AA, etc.

    This card is a great line-up filler. I can see a use for this in a variety of budget gaming systems.
  • R3MF - Monday, March 25, 2013 - link


    i spent £400 on an MSI 7970 Lightning, but not everyone is that stupid! :D
  • evonitzer - Friday, March 22, 2013 - link

    Well with a name like Hardcore69, of course you would want the best of the best of the best (with honors). But I'm a casual PC gamer, so this card looks pretty great to me. My 4870 is getting a little (ok, very) long in the tooth. Why would I buy a console and pay full price for games, only use a controller, and have to pay a monthly fee (x360) just to play casually when I could pick up a $150 card and drop it into my computer? Reply
  • CeriseCogburn - Sunday, March 24, 2013 - link

    His point wasn't your pathetic budget, his point was the graphics suck like a console.
    Just keep the 4870, it sucks too.
  • I am as mad as hell - Friday, March 22, 2013 - link

    The day will come, in the not so distant future, that 700W PS requirements or higher for high-end gaming machines will come to an end (thankfully). And the whole system will not consume more than 100W and fits inside a mATX case or smaller (and no need for Godzilla size cooling fans anymore either). Reply
  • CeriseCogburn - Sunday, March 24, 2013 - link

    It's called Haswell. Reply

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