simply speaking - just rumors, no truth in that.
i don't know about before, right now intel cpus work well with both amd and nvidia gfx cards. amd cards need more cpu power than nvidia cards, so gfx card performance is more pronounced with intel cpu with amd gfx card. most amd cpus hold back the gfx cards in cpu-intensive situations. overclocking helps, but not up to the level of performance of stock intel cpu and amd gfx card combo. however, if you cherry-pick your amd and intel cpu, you can champion one amd cpu vs another intel cpu and vice versa. this link should give you an idea: http://www.tomshardware.com/reviews/gaming-fx-pentium-a...
it measures cpu performance against the strongest amd single gpu card. the overclocked i5 2500k is used as a scale to how other cpus perform.
cpu performance becomes even more pronounced if you have a multi-gpu combination running e.g. cfx, sli. both cfx and sli need good amount of cpu power. in those cases, an intel cpu would outperform a comparable amd cpu. http://www.tomshardware.com/reviews/fx-overclock-crossf... http://www.tomshardware.com/reviews/core-i5-fx-6100-ove...
amd does advertise their combination of amd cpu, amd gfx card etc (may be motherboard chipsets, ram and cooler too) as a single platform - scorpius (iirc phenom + amd gfx card platform was called dragon?), but it's just a marketing gimmick. as long as you pick your parts for performance you don't have to stick with one single brand.
amd uses sb-e platform to determine 7950/7970 3dmark performance http://www.amd.com/us/products/desktop/graphics/7000/79...
this is a bit different from usual testing though. the 7900 cards run on pcie 3.0 and right now only intel has a pcie 3.0 capable solution available. so amd has no choice but to use intel.
Where was the reference documents to this personal rhetoric or yours ?
Right from AMDs own website.
"Based on GCN Architecture, the world’s first 28nm graphics architecture, the AMD Radeon™ HD 7970 and HD 7950 graphics achieve 3DMark® 11 scores in excess of X2700 and X2200, respectively. These results are the two highest scores achieved by single-GPU graphics cards on stock platforms as of 26 January, 2012. System configuration: Intel Core i7-3960X (3.3GHz), MSI X79A-GD65 8D, 16GB DDR3-1600 (9-9-9-24) and Windows® 7 64-bit."
Mabey you fail to realize that because Nvidia uses Intel to bench then perhaps just maybe AMD has to keep the playing field level APPLES TO APPLES comparo to be fair and legit and keep the parameters as even as possible.
Everyone with half a brain knows it is because AMD doesn't want to be CPU limited when showing off their GPU, and their best bet to achieve this across the board currently, is with a top of the range Intel based CPU.