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Is something wrong with the 79xx cards ???

Mar 4, 2009
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When you compare the 7870 vs. the 7970 ... i cant help but notice that somethings really wrong with the 7970 ... :confused:

The 7870 has 1280SPs while the 7970 has a total of 2048SPs ... i.e the 7970 has 60% more SPs than the 7870 ... and mem and core clocks sort of even out ... cos 7870 has has a higher core clock while the 7970 has higher mem clock ...

but when you compare the performance ... the 7970 is only around 25% faster on average than the 7870 ... i feel there seems to some kinda bottlenecking ... maybe ROPS ... or GCN doesnt scale well ... or may be AMD is purposely doing it ... so when they bring out their next gen cards ... it would look like a huge performance leap ... or may be they'll release a new driver to increase the performance when GTX680 is released :pimp:

EDIT: i totally forgot that 7970 has 384-bit memory ... :rolleyes: ...
Last edited:
Mar 24, 2011
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Apr 4, 2008
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Minus a hefty chunk of SP's yes.
They don't seem to really be missed. Clock for clock difference between the two seems to be 4.5%, which shrinks to 2.5% if you flash it with a 7970 bios. Presumably from lower memory timings. Not enough people have done it to say it's safe though.
Nov 13, 2007
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its definitely bottlenecked for gfx - also - the 7970 is a compute card at heart. Those extra SPs were probably more for gpgpu than gfx rendering. The 7870 is more of a gaming card, so its is better suited for those workloads.
Mar 10, 2010
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Look the gpu up .on a 7870/50 there is in effect a dual core gpu dual geometry and setup engines with a shader array apiece(ready for transfer to apu 2/cores allows binning when one doesnt work) the 7970 does not have this .its stacked with shaders instead for gpgpu apps

nvidias upcoming 680 has even more setup /geo units