Optane wasn't DRAM; that was literally the whole point of it's existence. Intel hasn't proven that they can make DDR4 let alone LPDDR5 or GDDR, and even if they did it wouldn't have helped produce Arc GPU chips since they were supply-constrained by TSMC.
Intel could have piles of GDDR sitting around, and Arc GPUs would still be have limited supply. It's just the way the product was made.
Intel could have piles of GDDR sitting around, and Arc GPUs would still be have limited supply. It's just the way the product was made.