Everyone associates Raja with Polaris, when he actually set the foundation for Navi while at AMD. Nonetheless, even Polaris was amazing value at the time (I miss those days compared to the shit show we have in the gpu market today). Absolutely nothing viable at a decent price, and all our wishes for AMD to become competitive so we can see better pricing did not come to fruition as you can see today (the fact Intel is our last hope is a very sad reality indeed).
With ARC, I dismissed it at first until I recently started paying close attention to it in reviews, and its actually quite impressive for what it is. The ray tracing implementation is solid. It beats out a 6700xt for much less. This is only a solid foundation for Intel to continue. If they stop now it would be very shortsighted of them. Anyways, thats what Raja (and other other architects) do in general. They join, lead a project or program up to a run and maintain/growth phase, and then move on to kick start something new. Jim Keller did that with Zen, and Raja did the same with Navi at AMD.
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That is a very......selective history.
Raja did some amazing work at ATi back in the day, serving as CTO from 2001 to 2009. That era gave us some great chips, the evergreen design, ece. It should be noted, however, that the foundations for the legend that was the r300 were actually made by artX, by Dr. Wei Yen, a former silicon graphics engineer who also led the n64 GPU project.
In regards to polaris, yes raja did head up that design. Polaris was good, primarily because it was cheap. What it did not do was significantly put itself above the 290/x/390/x hawaii chips that AMD had already made, and sold, often for $200-$300 by the end of their lifespan. Many, including myself, asked where the higher end polaris chips were, when were we going to get an improvement over hawaii, and Raja's answer?
"well, buy 2 and crossfire"
That was a TERRIBLE response. Crossfire was already a sinking ship, as was SLI, the writing had been on the wall for years that big monolithic giant chips were the future of high end gaming. What it signaled everybody was that RTG, under raja, had spent the last 4 years as "rebrandeon"; reskinning their old GCN cards, and now had simply given up making a high end counterpoint to nvidia. Many, including myself on this very forum, called out a major issue, that was for all his bluster on "$200 GPUs making up a majority of buyers" there was no getting around nvidia being handled the entirety of the mid range and up on a silver platter.
The result? Nvidia ran with it. The $350 1070, the $550 1080, and the $700 1080ti had effectively 0 competition for, in some cases, nearly 18 months. The 1070 alone had higher margins per card then anything AMD sold, and outsold the entirety of polaris. As did the 1060. And to a point, so did the 1080. Nvidia made massive bank which would help fund turing, ampere, ece down the line.
Raja's genius plan was to pull a 3dfx, and split the resources of the meager RTG into two separate projects. The result of this was the embarrassment known as vega; a hot, power hungry, expensive card that was slower then the cheaper geforce cards and over a year late to market. Vega was an abysmal failure in the high end GPU space, even for the claims it was decent at some server work, RTG's server market would collapse during this era.
I could go on. I didnt even get into the embarrassment that was the "overclockers dream" fury/X cards. Nor did I get into drivers, because as you may have noticed, outside of a 4 year span Raja was in charge of ATI/AMD/RTG graphics (the span which gave us the great first gen GCN cards), and during that time period AMD gained its abysmal reputation for driver issues and instability. rDNA2, and AMD's modern, far better drivers, occurred after his departure. Lets not even get into the abandoned Radeon VII.
Now lets fast forward to intel. Raja joined in 2017. Now making a GPU from scratch is hard. Even so, with billions behind him, decades of experience, and some work already done in the form of the iris cores, Raja went to work.
The result? Alchemist was delayed. Repeatedly. It launched nearly 2 years later then planned. It's drivers were woefully incompetent, unexplained since intel's iGPU drivers, while not the best, at least worked properly. It's performance was not what was promised, power consumption was quite high, and it had numerous quirks like being useless without ReBAR. The launch was a wet fart, with little fanfare and few models available. Shortly after launch the GPU division is split in two, and now that raja is not the head, suddenly intel is responsive on getting better drivers out and promoting their products. Supposedly today, intel is shifting numbers similar to AMD, and raja is no longer there.
Raja, he may have done some great things in the 2000s, but his 2010s and early 2020's performance has been, to say the least, lackluster. Polaris was a weak shining star in a sea of half baked silicon and terrible software support; one that AMD had in its hand and just did nothing with despite its popularity. Intel's GPU division will likely do far better with him gone. Many want to compare him to jim keller, but keller always left after successful, often revolutionary launches. Athlon 64, the early generations of apple's A silicon, zen and zen+. Raja on the other hand either leaves right after a sputter of a launch or right before SHTF, let us not forget that 2009 was the last good year of evergreen, in 2010 fermi 2.0 embarrassed AMD all the way to the bank.