HDDs and SSDs are both storage drives that store data even when not powered. They are MUCH slower than RAM which is what GDDR is. RAM loses all of its data when turned off. In addition storage is storage is relatively inexpensive compared to RAM. If you look at 1tb of an HDD it might cost around 40-50$. For that same price you only get around 16gb of ram. For reference ~1000gb = 1tb.
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