AMD Radeon HD 7790 Review Feat. Sapphire: The First Desktop Sea Islands

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• GivMe1 - Friday, March 22, 2013 - link

  128bit interface is going to hurt high res textures...

• CeriseCogburn - Sunday, March 24, 2013 - link

  Oh no it won't ! this is amd man! nothing hurts when it's amd ! amd yes it can !

• Quizzical - Friday, March 22, 2013 - link

  Your chart shows Radeon HD 6870 FP64 performance as N/A. I think it's 1/20 of FP32 performance, but I'm not sure of that. It definitely can do FP64, as otherwise, it wouldn't be able to claim OpenGL 4 compliance.

• MrSpadge - Friday, March 22, 2013 - link

  No, it doesn't have any HARDWARE FP64 capabilities. It's always possible to emulate this at slow performance via software, though.

• Quizzical - Friday, March 22, 2013 - link

  It's basically the same as what the 7770, 7790, and 7850 do, but they're not listed as N/A. The relevant question isn't whether you can do it more slowly, but how much more slowly.

• MrSpadge - Tuesday, March 26, 2013 - link

  No, it's not the same, the GCN cards have hardware FP64 capabilities.

• Ryan Smith - Friday, March 22, 2013 - link

  Let's be clear here. 85W is not the TDP. The TDP is higher (likely on the order of 110W or so). However AMD chooses not to publish the TDP for these lower end cards, and instead the TBP.

• alwayssts - Friday, March 22, 2013 - link

  Yeah, I figure ~85 TBP/105w TDP because that would be smack between 7770/7850 as well as having 20% headroom (which also allows another product to have their TBP between there and 7850's max TDP with it's max tdp above it within 150w....ie ~120-125/150w). IIRC, 80w is the powertune max (TDP) of 7770, 130w for 7850. 85w is the stock operation (TBP) of 7790.
  
  I really, really dislike how convoluted this power game has become...can you tell?!
  
  First it was max power. Then it was nvidia stating typical power (so products were within pci-e spec) with AMD still quoting max, which made them look bad. Then we get this 'awesome' product segmentation with 7000 having TBP and max powertune TDPs to separate them, while nvidia quotes TBP and hides the fact the TDP limits for their products exist unless you deduce them from the percentage you can up the boost power.
  
  AAAAaaaarrrrrghhhhh. I miss when the product you had could do what you wanted it to, ie before software voltage control and multiple states, as for products like this it gives the user less control and the companies a ton to create segmentation. Low-end stock products may have been less-than-stellar back in the day, but with determination you could get something out of it without some marketing stating it should fit x niche so give it y max tdp so it doesn't interfere with the market of z product.

• CeriseCogburn - Friday, March 22, 2013 - link

  Maybe so you couldn't blow the crap out of it then return it for another one, then another one, as "you saved money" and caused everyone else to pay 25% more since you overclock freaks would blow them up, then LIE and get the freebie replacement, over and over again.
  
  Maybe they got sick of dealing with scam artist liars... maybe they aren't evil but the end user IS.

• Spunjji - Friday, March 22, 2013 - link

  Why would the design power be higher than the total board power? :/ You're correct that the figure they're quoting isn't TDP but then you just went and made up a number.
  
  Here's some actual power consumption measurements of a 7770:
  http://www.techpowerup.com/reviews/HIS/HD_7770_iCo...
  
  So using Ananad's figures to extrapolate you can expect this thing to be ~90W max, usually lower than that at peak, right about where AMD put it.