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  • Robert Pankiw - Saturday, January 12, 2013 - link

    According to the product page, the 7870 XT only has a 256bit memory bus, but Tahiti should have 384bit.

    Source: http://www.sapphiretech.com/presentation/product/?...

    What gives? If AMD let them name it the 7930, would it have the larger bus, or is it not allowed to be the 7930 because of the bus, or some other similar reasoning?

    Regardless, it looks like a really attractive sub-$300 card.
    Reply
  • JarredWalton - Saturday, January 12, 2013 - link

    I'm not sure on the bus; I would assume that's potentially the reason AMD is selling this harvested chip -- that maybe one of the memory controllers is flaky so they have to go with a 256-bit bus. Maybe that's also why AMD is requiring the part to be sold as a 7870 XT instead of 7930, but either way it's a decent looking card on paper. Reply
  • funguseater - Saturday, January 12, 2013 - link

    People will be more inclined to buy a high end "upgraded" 7800 series than the lowest tier 7900, even though its just a number. Check out the reviews it gets almost the same performance as standard 7870 just marketing hoodoo to sell imperfect 7900's. Reply
  • Gc - Sunday, January 13, 2013 - link

    For double precision GPU compute, Tahiti has much higher performance than Pitcairn. According to specs listed at GPUZOO (http://www.gpuzoo.com/GPU-AMD/), the performance is very near the 7950.

    160 GFLOPS DP, 2560 GFLOPS SP - 7870 GHz (Pitcairn)
    710 GFLOPS DP, 2841 GFLOPS SP - 7870 XT (Tahiti LE)
    716 GFLOPS DP, 2867 GFLOPS SP - 7950 (Tahiti)
    761 GFLOPS DP, 3046 GFLOPS SP - 7950 Boost (Tahiti)
    947 GFLOPS DP, 3788 GFLOPS SP - 7970 (Tahiti)
    1024 GFLOPS SP, 4096 GFLOPS SP - 7970 GHz (Tahiti)

    I wonder if these are measured LinPack numbers or theoretical maximums; I suspect the latter, especially the round numbers for 7870 GHz and 7970 GHz.
    Reply
  • CeriseCogburn - Monday, January 14, 2013 - link


    It has an Intel socket on board for the cpu right ?

    I checked the whole article twice - still no clue here other than the absence of information.

    Instead we get amd vid card promo.

    Well amd cpu's suck so badly it's so embarrassing, we just couldn't say it's a mobile Intel cpu socket.... right ?

    They have to hide that fact. They made the author cover up too.
    Reply
  • LucianMLI - Tuesday, January 15, 2013 - link

    You can see in the 5th picture on the box it says it uses an AMD APU Reply

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