AMD gave that (8 CUs with GCN architecture) away by themselves in a footnote of some slide (financial analyst day).
AMD at least wished for it but as GCN is executes much better than VLIW4, when it comes to graphics, they could stick with same number of VLIW4 cores used in Trinity and still gain 20% at the same GPU frequency.
Their GPU in APU already is sharing 128b DDR3 IMC with dual-module CPU which retrains its graphic performance. Thus some high jumps in core counts (eg. 8CU vs 6CU) aren't something they desperately need especially due to lack of PDSOI availability for 28nm node while Trinity die is already 220mm2. Dumping SOI and going to 28nm pretty much means that Trinity if it'd be shrinked to 28nm it would stay around same die size as they need to widen gaps between transistors for bulk process.
They could gain some additional graphic performance just by adopting ddr3-2133 support. To sum at total to 25% over 6CU GPU used in Trinity.
The only reason to go for +2CUs is obviously
just for bragging rights for the total FLOPs performance, as this is the cheapest way and still those FLOPs are plain old 32bit FLOPs (which are deliberately avoided to be duly noted anywhere in those slides)
As additional 2CUs would merly require ~15mm2 they could easily implement it but there's no way they should use 4RBE ("16ROPs") we saw in Cape Verde Pro as this would at leas require additional 64-bit GDDR5 IMC (aka. some version of SidePort) to properly employ it.
Also, I am skeptical of the 16 rops. To put it frankly, it won't be able to keep them fed -- might as well drop to 8.
I'm there with you if they don't implement another gddr5 IMC which require additional (~20mm2) and 2RBEs (at least 15mm2). IMO its just too much to expect chip size grew up for 50mm2 in the same time while they're dumping SOI and no real shrink gain from 32nm would be visible.
I don't know if this comes from improvements in memory controllers, better Z-buffering, greater emphasys on less bandwidth-consuming operations during game development or others, but the truth is that general performance-per-GB/s in graphics cards has been steadily rising.
Mostly it comes from better compression algorithms which now could be easily implemented when there so much raw CU performance lying around
(marketing FLOPs) that would be wasted and starved if it should reside on poor ddr3 memory bandwidth shared with CPU thru L3
Kaveri means "buddy" in Finnish. Just so you know.
Tnx. It's a nice name. But still what Kabini means then? And arent those Indian codenames?