Caporegime
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Those have a 256 bit bus though which seems to give good enough bandwidth with GDDR6 to not limit the cards, going down to 128 is a large cut in bandwidth and definitely impacted the lower end cards last gen.
Navi 44 apparently has half the shaders,so half the bandwidth will mean the compute units will hit similar bandwidth limitations. Like I said the RTX5070 has more bandwidth than an RX9070XT and so does an RTX4070TI Super.
There are rumours the Navi 44 chip is well under 200MM2,and Navi 48 is essentially a pair of Navi44 chips hence the rectangular Navi 48 chip.
The problem is half an RX9070XT is essentially RTX3060TI/RX6700XT level performance. Maybe with high enough core clocks it will be around an RTX4060TI:

Sapphire Radeon RX 9070 XT Pulse Review
Sapphire’s Radeon RX 9070 XT Pulse trades flashy extras for substance, to hit its $600 MSRP. There's no RGB lighting or factory overclock, but you get an outstanding cooler that runs whisper-quiet at full load with good temperatures. Performance where it counts.
So unless the rumours are wrong,the RX9060 is an RTX5060 competitor.
I just looked up Navi 44 die size, its 153mm^2, i'm guessing it has around 40 CU's (2560 Shaders, that is a common number for mid range AMD GPU's) that should put it around an RX 7800 XT but with that memory interface probably actually around an RX 7700 XT.
If they just added two 32Bit Memory Controllers at 23mm^2 it would bring the 192Bit 12GB Navi 44 to something more in line with the RX 7800 XT at 176mm^2, they wouldn't even need to clamshell it to make a 16GB version and add £70 to the base price to pay for the complicated PCB and doubling of VRam chips.
It makes much more sense, surely to AMD too.... ???????
Probably 32 CUs as that is half a Navi 48.
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