The 290X vs. 290 scaling doesn't work because there is not a linear increase in ROPs/memory bandwidth. R9 390X should have more than double the effective memory bandwidth increase over R9 290X and more than 50% increase in shader, texture and pixel fill-rate. But even if we assume your 45.6% increase, that puts us 2-3% behind Titan X. At $700, that would already make it a better buy than the Titan X. Now imagine R9 390 nonX just 10% slower than an R9 390X --> we would end up with a chip 13-14% slower than the Titan X for $500. Say hello to 2 of those in CF! Good-bye Titan X! :biggrin:
As I said before, all the hype is centered around 390X but if you look back at the history of AMD (5850/6950 unlocked/7950/R9 290 nonX), it's those 2nd tier AMD cards, when overclocked, provide hands down the best value on the AMD high-end. Remember
this article?
AMD tends to charge too high of a premium for the small difference for its flagship cards (remember X850XT PE vs. X800XT or 9800XT 256MB over 9800 Pro?) AMD can still entice gamers to step-up to the R9 390X at $700 over the $500 R9 390 nonX if the latter only has 4GB of VRAM+air cooling, but the former has 8GB+AIO CLC. That would provide a huge incentive for high-end gamers to step-up to the 390X.