Ethereum forum, they made a calculation and said most GPUs won't be able to mine Ethereum due to DAG limit. Only 4GB and higher will work.
Do you have a source for this calculation? Someone is making a mistake here. The DAG will be 2.24gb in exactly one year. Not over 3gb in 45 days.
Please also see https://github.com/ethereum/wiki/wiki/Ethash-Design-Rationale
QUOTE FROM SITE:
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The ~0.73x per year growth level was chosen to roughly be balanced with Moore's law increases at least initially (exponential growth has a risk of overshooting Moore's law, leading to a situation where mining requires very large amounts of memory and ordinary GPUs are no longer usable for mining).
Furthermore, mining phase will finish in serenity, which is a year away.
That makes the window to make a profit very narrow.
Should start assembling my mining rig right now.