In his Mad Money broadcast on July 9, Jim Cramer defended a former tech-market darling, arguing that the market has the valuation math backwards. His frustration centered on why sellers keep unloading NVIDIA (NASDAQ:NVDA) while assigning higher forward multiples to memory names like SanDisk (NASDAQ:SNDK). Cramer put it directly: “Some commodity chip companies like SanDisk ... Jim Cramer Says NVIDIA Is the Most Proprietary Chip Company in History…