I zoomed in all the way and the PCB number matched the one zoomed in on the TechPowerup! review.
Originally Posted by geoxile
Still seems like the 290 is still underperforming slightly. Doesn't it have 2x the components of a 270x? And 270x crossfire scaling is like 80%. So 1 290 = 1.8 270x. Though I guess there is a small difference in clock speeds as well.
R9 290 is double Pitcairn XT literally:
double the ROPs, double the shaders, double the memory bus (and HD7870GE memory is clocked at 1200Mhz , R9 270X is 1400Mhz), double the TMUs , double the raster engines, double the Double precision floating point (2 x 1/16 = 1/8) , Double the triangles per clock (compared to Tahiti/Pitcairn)
947Mhz vs 1Ghz shouldn't make that much of a difference (1050Mhz for R9 270X) but I think the memory speed being 200Mhz less than R9 270x might be the reason for it (along with thermal throttling).
However according to the functional block diagram the Hawaii chip has EIGHT ACEs (asynchornous command engines), rather than 2 of the Pitcairn/Tahiti ,plus the Geometry Engine and Rasterizer moved to shader engine.
947Mhz *2 /1050Mhz = about 1.8Edited by AlphaC - 11/7/13 at 8:05pm