Do anyone believe in that random picked number? I really doubt that number.
It is nice to state that it's only a small number to calm down the Haters, Fanboys and those who do not belong in any of those two groups.
If nvidia really know it is 0.5% than recall all those chips. If products are made than put a sticker on the box, flash a different firmware and sell those cards as nvidia 5090 G = Good Value
Garbage edition (D is already used for D=defect)
We have identified a rare issue affecting less than 0.5% (half a percent) of GeForce RTX 5090 / 5090D and 5070 Ti GPUs which have one fewer ROP than specified. The average graphical performance impact is 4%, with no impact on AI and Compute workloads. Affected consumers can contact the board manufacturer for a replacement. The production anomaly has been corrected.
Personally I would not call 0.5 % a small value. Far too large. I doubt that only one in every 200 cards is effected. I think it's a higher number.
That issue popped up quite fast. Not everyone reads, not everyone uses or has access that special read out software. Not everyone runs that software after the driver for correct readout is installed. Not everyone uses windows.
It's not the driver which ensures correct hardware functionality but the firmware, aka VBIOS, these cards have to be shipped with a different firmware for them to work correctly, there is no self correcting software, the firmware needs to know to which units it can issue micro ops.
I highly doubt that. The hardware has some mechanism to know itself which ones are defect. I assume those defect areas do not exists anymore because the connections are lasercut in the factory. The firmware just probes the hardware and see it.
Anyway - the firmware needs to be programmed for such a mechanism beforehand. The hardware needs to be prepared for that mechanism beforehand. There is no random we have less rop issue.